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march 2007 rev 5 1/71 1 TDA7402 car radio signal processor features 3 stereo inputs 3 mono inputs dynamic-compression-stage for cd softstep-volume bass, treble and loudness control voice-band-filter direct mute and softmute internal beep four independent speaker-outputs stereo subwoofer output independent second source-selector full mixing capability pause detector stereo decoder: rds mute no external adjustments am/fm noiseblanker with several trigger controls programmable multipath detector quality detector output digital control: i 2 c bus interface description the device includes a high performance audioprocessor and a stereo decoder-noise blanker combination, with the whole low frequency signal processing necessary for state of the art, as well as future car radios. the digital control allows a programming in a wide range of all the filter characteristics. the stereo decoder part also offers several possibilities of programming, especially for the adaptation to different if devices. lqfp44 table 1. device summary part numbers package packing TDA7402 lqfp44 (10x 10x 1.4mm) tube www.st.com
contents TDA7402 2/71 contents 1 pin connections and block diagra m . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 audioprocessor part features: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4 audioprocessor part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1.1 full-differential stereo input 1 (fd1) . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1.2 full-differential stereo input 2 (fd2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1.3 mono differential input 1 (md1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.1.4 mono differential input 2 (md2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.1.5 single ended stereo input (se1), single ended mono input (am) and fm- mpx input 18 4.2 autozero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2.1 autozero for stereo decoder selection . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2.2 autozero remain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3 pause detector / mux-output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3.1 loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3.2 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3.3 peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3.4 loudness order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3.5 flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4 softmute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.5 softstep volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.6 bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.6.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.6.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.6.3 quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.6.4 dc mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.7 treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.7.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.7.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.8 subwoofer application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
TDA7402 contents 3/71 4.9 voice band application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.10 compander . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.10.1 anti-clipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.10.2 characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.10.3 i2c bus timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.11 ac coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.12 output selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.13 subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4.14 speaker attenuator and mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.15 audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5 stereo decoder part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.1 features: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.3 notes about the characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.3.1 intermodulation suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.3.2 traffic radio (v.f.) suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 5.3.3 sca (subsidiary communications authorization) . . . . . . . . . . . . . . . . . . 35 5.3.4 aci (adjacent channel interference) . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.4 noise blanker part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.4.1 features: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5.5 multipath detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.5.1 features: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6 functional description of stereo decoder . . . . . . . . . . . . . . . . . . . . . . . 40 6.1 stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 6.2 ingain + infilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.3 demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.4 de-emphasis and highcut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.5 pll and pilot tone detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.6 field strength control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.7 evel input and gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.8 stereo blend control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 6.9 highcut control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
contents TDA7402 4/71 7 functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . 45 7.1 trigger path fm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 7.2 noise controlled threshold adjustment (nct) . . . . . . . . . . . . . . . . . . . . . 45 7.3 additional threshold control mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.3.1 automatic threshold control by the stereo blend voltage . . . . . . . . . . . . 46 7.3.2 over deviation detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.3.3 multipath level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 7.3.4 am mode of the noiseblanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 8 functional description of the multipath detector . . . . . . . . . . . . . . . . . 47 8.1 quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 8.2 testmode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 8.3 dual mpx usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 8.3.1 feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 8.3.2 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 9i 2 c bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 9.1 interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 9.2 auto increment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 9.3 transmitted data (send mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 9.4 subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 9.5 data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 10 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 11 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 12 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
TDA7402 list of tables 5/71 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 5. supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 6. attack times vs soft-step times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 7. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 8. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 table 9. electrical characteristics of multipath detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 table 10. transmitted data (send mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 table 11. reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 table 12. subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 table 13. main selector (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 table 14. main loudness (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 table 15. volume (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 16. treble filter (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 17. bass filter (4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 18. mixing programming (5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 table 19. soft mute (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 20. voiceband (7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 21. second source selector (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 table 22. second loudness (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 23. subwoofer configuration / bass (10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 24. compander (11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 table 25. configuration audioprocessor i (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 table 26. configuration audioprocessor ii (13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 table 27. speaker, subwoofer and mixer level-control (14-20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 table 28. testing audioprocessor (21). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 table 29. stereo decoder (22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 table 30. noise blanker i (23) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 table 31. noiseblanker ii (24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 32. am / fm noiseblanker (25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 33. high cut (26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 table 34. fieldstrength control (27) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 35. multipath detector (28) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 36. stereo decoder adjustment (29) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 table 37. stereo decoder configuration (30) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 38. testing stereo decoder (31) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 39. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
list of figures TDA7402 6/71 list of figures figure 1. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 2. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 3. input-stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 4. loudness attenuation @ fp = 400hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 5. loudness center frequencies @ attn. = 15db. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 6. 1st and 2nd order loudness @ attn. = 15db, fp=400hz . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 7. softmute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 8. softstep timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 9. bass control @ fc = 80hz, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 10. bass center frequencies @ gain = 14db, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 11. bass quality factors @ gain = 14db, fc = 80hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 12. bass normal and dc mode @ gain = 14db, fc = 80hz . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 13. treble control @ fc = 17.5khz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 14. treble center frequencies @ gain = 14db . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 15. subwoofer application with lpf 80/120/160hz and hpf 90/135/180hz . . . . . . . . . . . . . . 25 figure 16. voiceband application with hpf 300/450/600/750hz and lpf 3k/6khz . . . . . . . . . . . . . . 25 figure 17. compander block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 figure 18. compander characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 figure 19. output selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 20. application 1 using internal highpass and mono low pass filter . . . . . . . . . . . . . . . . . . . . . 29 figure 21. application 2 using internal highpass and external stereo low pass filter . . . . . . . . . . . . . . 30 figure 22. application 3 using pure external filtering (e.g. dsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 figure 23. output selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 figure 24. vn timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 figure 25. trigger threshold vs. vpeak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 figure 26. deviation controlled trigger adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 figure 27. field strength controlled trigger adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 figure 28. block diagram of stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 figure 29. signals during stereo decoder's softmute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 figure 30. signal control via softmute pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 figure 31. internal stereo blend characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 figure 32. relation between internal and external level voltages for setup of stereo blend . . . . . . 43 figure 33. highcut characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 figure 34. block diagram of the noise blanker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 figure 35. block diagram of the multipath detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 figure 36. dual mpx input diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 figure 37. application diagram (standard configuration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 figure 38. application diagram (dual mpx mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 figure 39. lqfp44 (10x10) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . 69
TDA7402 pin connections and block diagram 7/71 1 pin connections and block diagram figure 1. pin connection (top view) 1 2 3 5 6 4 7 8 9 10 17 11 18 19 20 21 22 44 43 42 41 39 40 38 37 36 35 34 28 27 26 24 23 25 33 32 31 29 30 se1l se1r fd1l+/se3l fd1l-/se2l fd1r+/se3r fd1r-/se2r fd2l+ fd2l- fd2r+ fd2r- am am if mpx level mpin mpout qual sm gnd sda scl vdd acinlf swinr swinl acoutr acoutl cref mux/pause md1/se4r md1g/se4l md2 md2g outssr outssl outswr outswl outrr outrf outlr outlf acinrr acinrf acinlr d00au1131 12 13 14 15 16
pin connections and block diagram TDA7402 8/71 figure 2. block diagram input- multiplexer fd1l+ mux chg am aux main navi phone fd1l- fd1r+ fd1r- fd2l+ fd2l- fd2r+ fd2r- sel sen mpx ser md1 md1g md2 md2g main source selector in-gain + auto zero loudness loudness pilot cancellation multipath detector am/fm noise banker pulse former demodulator + stereo adjust + stereo blend digital control iic bus compander anti clip. input treble soft mute mixing selector second source selector soft step volume bass mute in gain pause pil. det. pll 80khz lp beep front acin rear sw hp lp voice bandpass output selector mixer mono-fader mono-fader sm + acoutl acoutr mono-fader mono-fader subwoofer + phone control mono-fader mono-fader swinr swinl acinrr acinrf acinlr acinlf outlf outlr outrf outrr outswl outswr sda scl qual vdd gnd cref outssl outssr 25khz lp s & h d a high cut qual. level d00au1130 mpout mpin supply am-if
TDA7402 electrical specifications 9/71 2 electrical specifications v s = 9v; t amb = 25c; r l = 10k ; all gains = 0db; f = 1khz; unless otherwise specified table 2. electrical characteristics symbol parameter test condition min. typ. max. unit input selector r in input resistance all single ended inputs 70 100 130 k v cl clipping level 2.2 2.6 v rms s in input separation 80 100 db g in min min. input gain -1 0 +1 db g in max max. input gain 13 15 17 db g step step resolution 0.5 1 1.5 db v dc dc steps adjacent gain steps -5 1 5 mv g min to g max -10 6 10 mv v offset remaining offset with autozero 0.5 mv differential stereo inputs r in input resistance (see figure 3 ) differential 70 100 130 k g cd gain only at true differential input -1 0 1 db -5 -6 7 db -11 -12 -13 db cmrr common mode rejection ratio v cm = 1v rms @ 1khz 46 70 db v cm = 1v rms @ 10khz 46 60 db e no output-noise @ speaker outputs 20hz - 20khz, flat; all stages 0db 9 15 v differential mono inputs r in input impedance differential 40 56 72 k cmrr common mode rejection ratio v cm = 1v rms @ 1khz 40 70 db v cm = 1v rms @ 10khz 40 60 db beep control v rms beep level mix-gain = 6db 250 350 500 mv f beep beep frequency f beep1 570 600 630 hz f beep2 740 780 820 hz f beep1 1.48 1.56 1.64 khz f beep1 2.28 2.4 2.52 khz
electrical specifications TDA7402 10/71 mixing control m level mixing ratio main / mix source -6/-6 db g max max. gain 131517db a max max. attenuation -83 -79 -75 db a step attennuation step 0.5 1 1.5 db multiplexer output (1) r out output impedance 225 300 w r l output load resistance 2 k c l output load capacitance 10 nf v dc dc voltage level 4.3 4.5 4.7 v loudness control a step step resolution 0.5 1 1.5 db a max max. attenuation -21 -19 -17 db f peak peak frequency f p1 180 200 220 hz f p2 360 400 440 hz f p3 540 600 660 hz f p4 720 800 880 hz volume control g max max. gain 303234db a max max. attenuation -83 -79.5 -75 db a step step resolution 0 0.5 1 db e a attenuation set error g = -20 to +20db -0.75 0 +0.75 db g = -80 to -20db -4 0 3 db e t tracking error 2db v dc dc steps adjacent attenuation steps 0.1 3 mv from 0db to g min 0.5 5 mv soft mute a mute mute attenuation 80 100 db t d delay time t1 0.48 1 ms t2 0.96 2 ms t3 70 123 170 ms t4 200 324 600 ms v th low low threshold for sm pin (2) 1v table 2. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
TDA7402 electrical specifications 11/71 v th high high threshold for sm pin 2.5 v r pu internal pull-up resistor 32 45 58 k v pu internal pull-up voltage 3.3 v bass control c range control range + 14 + 15 + 16 db a step step resolution 0.5 1 1.5 db f c center frequency f c1 54 60 66 hz f c2 63 70 77 hz f c3 72 80 88 hz f c4 81 90 99 hz f c5 90 100 110 hz f c6 117 130 143 hz f c7 135 150 165 hz f c8 180 200 220 hz q bass quality factor q 1 0.911.1 q 2 1.11.251.4 q 3 1.3 1.5 1.7 q 4 1.822.2 dc gain bass-dc-gain dc = off -1 0 +1 db dc = on 4 4.4 6 db treble control c range control range + 14 + 15 + 16 db a step step resolution 0.5 1 1.5 db f c center frequency f c1 81012khz f c2 10 12.5 15 khz f c3 12 15 18 khz f c4 14 17.5 21 khz pause detector (3) v th zero crossing threshold window 1 40 mv window 2 80 mv window 3 160 mv i delay pull-up current 152535 a v thp pause threshold 3.0 v table 2. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
electrical specifications TDA7402 12/71 speaker attenuators r in input impedance 35 50 65 k g max max. gain 141516db a max max. attenuation -83 -79 -75 db a step step resolution 0.5 1 1.5 db a mute output mute attenuation 80 90 db e e attenuation set error 2 db v dc dc steps adjacent attenuation steps 0.1 5 mv audio outputs v clip clipping level d = 0.3% 2.2 2.6 v rms r l output load resistance 2 k c l output load capacitance 10 nf r out output impedance 30 100 w v dc dc voltage level 4.3 4.5 4.7 v voice bandpass f hp highpass corner frequency f hp1 81 90 99 hz f hp2 122 135 148 hz f hp3 162 180 198 hz f hp4 194 215 236 hz f hp5 270 300 330 hz f hp6 405 450 495 hz f hp7 540 600 660 hz f hp8 675 750 825 hz f lp lowpass corner frequency f lp1 2.733.3khz f lp2 5.466.6khz subwoofer attenuators r in input impedance 35 50 65 k g max max. gain 141516db a at t n max. attenuation -83 -79 -75 db a step step resolution 0.5 1 1.5 db a mute output mute attenuation 80 90 db e e attenuation set error 2 db v dc dc steps adjacent attenuation steps 1 5 mv table 2. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
TDA7402 electrical specifications 13/71 subwoofer lowpass f lp lowpass corner frequency f lp1 72 80 88 hz f lp2 108 120 132 hz f lp3 144 160 176 hz differential outputs (4) r l load resistance at each output 1v rms ; ac coupled; thd=1% 1 k 2v rms ; ac coupled; thd=1% 2 k r dl load resistance differential 1v rms ; ac coupled; thd=1% 2 k 2v rms ; ac coupled; thd=1% 4 k c lmax capacitive load at each output c lmax at each output to ground 10 nf c dlmax capacitive load differential c lmax between output terminals 5 nf v offset dc offset at pins output muted -10 10 mv r out output impedance 30 100 w v dc dc voltage level 4.3 4.5 4.7 v e no output noise output muted 6 15 v compander g max max. compander gain vi < -46db 19 db vi < -46db, anti-clip = on 29 db t att attack time t att1 6ms t att2 12 ms t att3 24 ms t att4 49 ms t rel release time t rel1 390 ms t rel2 780 ms t rel3 1.17 s t rel4 1.56 s v ref compander reference input-level (equals 0db) v ref1 0.5 v rms v ref2 1.0 v rms v ref3 2.0 v rms c f compression factor output signal / input signal 0.5 general table 2. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
electrical specifications TDA7402 14/71 e no output noise bw = 20hz - 20khz output muted all gains = 0db single ended inputs 3 10 15 20 v v s/n signal to noise ratio all gains = 0db flat; v o = 2v rms 106 db bass, treble at +12db; a-weighted; v o = 2.6v rms 100 db ddistortion v in = 1v rms ; all stages 0db 0.005 0.1 % v out = 1v rms ; bass & treble = 12db 0.05 0.1 % s c channel separation left/right 80 100 db e t total tracking error a v = 0 to -20db -1 0 1 db a v = -20 to -60db -2 0 2 db 1. if configured as multiplexer-output 2. the sm pin is active low (mute = 0) 3. if configured as pause-output 4. if programmed as subwoofer diff. output table 3. absolute maximum ratings symbol parameter value unit v s operating supply voltage 10.5 v t amb operating temperature range -40 to 85 c t stg storage temperature range -55 to +150 c v esd esd protection (human body mode) 2000 v v esd esd protection (machine mode) 200 v table 4. thermal data symbol parameter value unit r th j-pins thermal resistance j unction-pins max 65 c/w table 5. supply symbol parameter test condition min. typ. max. unit v s supply voltage 7.5 9 10 v i s supply current v s = 9v 35 50 65 ma svrr ripple rejection @ 1khz audioprocessor (all filters flat) 60 db table 2. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
TDA7402 audioprocessor part features: 15/71 3 audioprocessor part features: input multiplexer ? 2 fully differential cd stereo inputs with programmable attenuation ? 1 single ended stereo input ? 2 differential mono input ? 1 single ended mono input ? in-gain 0..15db, 1db steps ? internal offset cancellation (autozero) ? separate second source selector beep ? internal beep with 4 frequencies mixing stage ? beep, phone and navigation mixable to all speaker outputs loudness ? programmable center frequency and frequency response ? 15 x 1db steps ? selectable flat-mode (constant attenuation) volume ? 0.5db attenuator ? 100db range ? soft-step control with programmable times compander ? dynamic range compression for use with cd ? 2:1 compression rate ? programmable max. gain bass ? 2nd order frequency response ? center frequency programmable in 8 steps ? dc gain programmable ?+ 15 x 1db steps tr e bl e ? 2nd order frequency response ? center frequency programmable in 4 steps ?+ 15 x 1db steps voice bandpass ? 2nd order butterworth highpass filter with programmable cut off frequency ? 2nd order butterworth lowpass filter with programmable cut off frequency ? selectable flat mode ?
audioprocessor part features: TDA7402 16/71 speaker ? 4 independent speaker controls in 1db steps ? control range 95db ? separate mute subwoofer ? single ended stereo output ? independent stereo level controls in 1db steps ? control range 95db ? separate mute mute functions ?direct mute ? digitally controlled softmute with 4 programmable mute-times pause detector ? programmable threshold
TDA7402 audioprocessor part 17/71 4 audioprocessor part 4.1 input stages in the basic configuration two full differential, two mono differential, one single ended stereo and one single ended mono input are available. in addition a dedicated input for the stereo decoder mpx signal is present. figure 3. input-stages 4.1.1 full-differential stereo input 1 (fd1) the fd1 input is implemented as a buffered full-differential stereo stage with 100k input impedance at each input. the attenuation is programmable in 3 steps from 0 to -12db in order to adapt the incoming signal level. a 6db attenuation is included in the differential stage, the additional 6db are done by a following resistive divider. this input is also configurable as two single ended stereo inputs (see pin-out). 4.1.2 full-differential stereo input 2 (fd2) the fd2 input has the same general structure as fd1, but with a programmable attenuation of 0 or 6db embedded in the differential stage. 100k 15k 15k 15k 15k 1 100k 100k 1 - + 100k 28k 28k 28k 28k se4r 100k - + 100k 15k 15k 15k 15k 1 100k 1 - + 100k 28k 28k 28k 28k 100k 100k 100k - + se2 se3 fd1- fd1+ stereo fd2- fd2+ stereo se4 se4r se1 stereo am mono mpx md1g md1 mono in gain in gain mute mute mute mixing stage second source selector mixing selector main source selector se3 beep fm md1 md2 fd1/se2 fd2 md1/se4 md2 se1 am fm se3 fd1/se2 fd2 md1/se4 md2 se1 am fm md2g md2 mono 100k noise blanker + stereo decoder d00au1142
audioprocessor part TDA7402 18/71 4.1.3 mono differential input 1 (md1) the md1 input is designed as a basic differential stage with 56k input impedance. this input is configurable as a single ended stereo input (see pin-out). 4.1.4 mono differential input 2 (md2) the md2 input has the same topology as md1, but without the possibility to configure it to single ended. 4.1.5 single ended stereo input (se1), single e nded mono input (am) and fm-mpx input all single ended inputs offer an input impedance of 100k . the am pin can be connected by software to the input of the stereo-decoder in order to use the am noiseblanker and am high cut feature. 4.2 autozero the autozero allows a reduction of the number of pins as well as external components by canceling any offset generated by or before the in-gain-stage (please notice that externally generated offsets, e.g. generated through the leakage current of the coupling capacitors, are not canceled). the auto zeroing is started every time the data-byte 0 is selected and needs max. 0.3ms for the alignment. to avoid audible clicks the audioprocessor is muted before the loudness stage during this time. the autozero feature is only present in the main signal path. 4.2.1 autozero for stereo decoder selection a special procedure is recommended for selecting the stereo decoder at the main input- selector to guarantee an optimum offset cancellation: 1. softmute or mute the signal-path 2. temporary deselect the stereo decoder at all input selectors 3. configure the stereo decoder via iic-bus 4. wait 1ms 5. select the stereo decoder at the main input selector first the root cause of this procedure is, that after muting the stereo decoder (step 1), the internal stereo decoder filters have to settle in order to perform a proper offset cancellation. 4.2.2 autozero remain in some cases, for example if the p is executing a refresh cycle of the i 2 c bus programming, it is not useful to start a ne w autozero action because no new source is selected and an undesired mute would appear at the outputs. for such applications the a619 could be switched in the autozero remain mode (bit 6 of the subaddress byte). if this bit is set to high, the databyte 0 could be loaded without invo king the autozero and the old adjustment value remains.
TDA7402 audioprocessor part 19/71 4.3 pause detector / mux-output the pin number 40 (pause/mux) is configurable for two different functions: 1. during pause detector off this pin is used as a mono output of the main input selector. this signal is often used to drive a level/equalizer display on the car radio front panel. 2. during pause detector on the pin is used to define the time constant of the detector by an external capacitor. the pause detector is driven by the internal stereo decoder outputs in order to use pauses in the fm signal for alternate frequency jumps. if the signal level of both stereo decoder channels is outside the programmed voltage window, the external capacitor is abruptly discharged. inside the pause condition the capacitor is slowly recharged by a constant current of 25a. the pause information is also available via i 2 c bus (see i 2 c bus programming). 4.3.1 loudness there are four parameters programmable in the loudness stage: 4.3.2 attenuation figure 4 shows the attenuation as a function of frequency at f p = 400hz figure 4. loudness attenuation @ f p = 400hz. db hz -25.0 -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k
audioprocessor part TDA7402 20/71 4.3.3 peak frequency figure 5 shows the four possible peak-frequencies at 200, 400, 600 and 800hz figure 5. loudness center frequencies @ attn. = 15db. 4.3.4 loudness order different shapes of 1st and 2nd-order loudness figure 6. 1st and 2nd order loudness @ attn. = 15db, f p =400hz 4.3.5 flat mode in flat mode the loudness stage works as a 0db to -19db attenuator. db hz -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k db hz -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k
TDA7402 audioprocessor part 21/71 4.4 softmute the digitally controlled softmute stage allows muting/demuting the signal with a i 2 c bus programmable slope. the mute process can either be activated by the softmute pin or by the i 2 c-bus. this slope is realized in a special s-shaped curve to mute slow in the critical regions (see figure 7 ). for timing purposes the bit0 of the i 2 c bus output register is set to 1 from the start of muting until the end of de-muting. figure 7. softmute timing note: please notice that a started mute action is always terminated and could not be interrupted by a change of the mute -signal. 4.5 softstep volume when the volume level is changed audible clicks could appear at the output. the root cause of those clicks could either be a dc offset before the volume stage or the sudden change of the envelope of the audiosignal. with the softstep feature both kinds of clicks could be reduced to a minimum and are no more audible. the blend time from one step to the next is programmable in four steps. figure 8. softstep timing 1 ext. mute +signal ref -signal 1 i 2 c bus out time d97au634 1db 0.5db -0.5db -1db time d00au1170 v out ss time
audioprocessor part TDA7402 22/71 note: for steps more than 0.5db the softstep mode should be deactivated because it could generate a hard 1db step during the blend time. 4.6 bass there are four parameters programmable in the bass stage: 4.6.1 attenuation figure 9 shows the attenuation as a function of frequency at a center frequency of 80hz. figure 9. bass control @ f c = 80hz, q = 1 4.6.2 center frequency figure 10 shows the eight possible center frequencies 60, 70, 80, 90, 100, 130, 150 and 200hz. figure 10. bass center frequencies @ gain = 14db, q = 1 -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k db hz db hz 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k
TDA7402 audioprocessor part 23/71 4.6.3 quality factors figure 11 shows the four possible quality factors 1, 1.25, 1.5 and 2. figure 11. bass quality factors @ gain = 14db, f c = 80hz 4.6.4 dc mode in this mode the dc-gain is increased by 4.4db. in addition the programmed center frequency and quality factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors. figure 12. bass normal and dc mode @ gain = 14db, f c = 80hz note: the center frequency, q and dc-mode can be set fully independently. 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k
audioprocessor part TDA7402 24/71 4.7 treble there are two parameters programmable in the treble stage: 4.7.1 attenuation figure 13. shows the attenuation as a function of frequency at a center frequency of 17.5khz. figure 13. treble control @ f c = 17.5khz 4.7.2 center frequency figure 14. shows the four possible center frequencies 10k, 12.5k, 15k and 17.5khz. figure 14. treble center frequencies @ gain = 14db -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k
TDA7402 audioprocessor part 25/71 4.8 subwoofer application figure 15. subwoofer application with lpf 80/120/160hz and hpf 90/135/180hz both filters, the lowpass and the highpass-filter, have butterworth characteristics so that their cut off frequencies are not equal, but shifted by the factor 1.125 to get a flat frequency response. 4.9 voice band application figure 16. voiceband application with hpf 300/450/600/750hz and lpf 3k/6khz db hz -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 100.0 1.0k 10.0k db hz -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 100.0 1.0k 10.0k
audioprocessor part TDA7402 26/71 4.10 compander signal compression a fully integrated signal compressor with programmable attack and decay times is present in the a619 (see figure 17 ). the compander consists of a signal level detection, an a/d converter plus adder and the normal softstep volume stage. first of all the left and the right ingain -signal is rectified, respectively, and the logarithm is build fr om the summed signal. the following low-pass smooth the output-signal of the logarithm amplifier and improves the low frequency suppression. the low pass output-voltage then is a/d converted an added to the current volume-word defined by the i 2 c bus. assuming reference level or higher at the compander input, the output of the adc is 0. at lower levels the voltage is increasing with 1bit/db. it is obvious that with this configuration and a 0.5db-step volume stage the compression rate is fixed to 2:1 (1db less at the input leads to 0.5db less at the output). the internal reference level of the compander is programmable in three steps from 0.5v rms to 2v rms . for a proper behavior of the compression circuit it is mandatory to have at a 0db input signal exactly the programmed reference level after the ingain-stage. e.g. at a configured reference-level of 0.5v rms the output of the ingain stage has to have also 0.5v rms at 0db source-signal (usually the 0db for cd is defined as the maximum possible signal-level). to adapt the external level to the internal reference level the programmable attenuation in the differential stages and the ingain can be used. figure 17. compander block diagram 4.10.1 anti-clipping in a second application the compander-circuit can be used for a anti-clipping or limiting function. in this case one of the dedicated inpu ts (am or mpin) is connected directly to the clip-detector of the power-amplifier. if no clipping is detected, the open-collector output of the power-amplifier is highohmic and the input-voltage of the rectifier is v ref . the level detector interprets this as a very small signal and reacts with the maximum programmed compander gain. in the application this gain has to be compensated by decreasing the inl inr inl inr clkatt clkrel outl outr outl 8 bit soft step volume adder iic-bus volume control d - + a + outr 8 bit 6 bit log ampl input select anti-clip enable clpin rin lin am mpin 50hz low-pass stereo full wave rectifier d00au1147
TDA7402 audioprocessor part 27/71 volume with the same value in order to get the desired output-level. in clipping situation the open collector current generates a voltage drop at the rectifier input, which forces the compander to decrease the gain until the clipping disappears. it is even possible to run the compression mode and the anti-clipping mode in parallel. in this case the maximum compander gain should be set to 29db. 4.10.2 characteristic to achieve the desired compression characteristic like shown below the volume has to be decreased by 4db. figure 18. compander characteristic 4.10.3 i2c bus timing while the compander is working, a volume word coming from this stage is added to the i 2 c bus volume word, and the volume is changed with a soft slope between adjacent steps (softstep stage). as mentioned in the description of this stage, it is not recommended to change the volume during this slope. to avoid this while the compander is working and the volume has to be changed, the compander hold-bit is implemented (bit 7 in the subaddress byte). the recommended timing for changing the volume during compander on is the following: 1. set the compander hold bit 2. wait the actual softstep time 3. change the volume 4. reset the compander hold bit the softstep-times are in compander on condition automatically adapted to the attack time of the compander. in the following table the related softstep-times are shown: db db -60 -50 -40 -30 -20 -10 0 0 -10 -20 -30 -40 -50 -60 input level output level -8db 15db -38db 2:1 table 6. attack times vs soft-step times attack time softstep time 6ms 0.16ms 12ms 0.32ms 24ms 0.64ms 48ms 1.28ms
audioprocessor part TDA7402 28/71 4.11 ac coupling in some applications additional signal manipulations are desired, for example surround sound or more band equalizing. for this purpose an ac coupling is placed before the speaker attenuators, which can be activated or internally shorted by the i 2 c bus. in short condition the input signal of the speaker attenuator is available at the ac outputs. the input impedance of this ac inputs is 50k . 4.12 output selector the output-selector allows to connect the main- or the second-source to the front, rear and subwoofer speaker attenuator, respectively. as an example of this programming the device is able to connect via software the main source to the back (rear) and the second source to the front (see figure 17 ). in addition to this stage allows to setup different applications by i 2 c bus programming. three examples are given in figure 18 , 19 , and 20 . figure 19. output selector voice band bandpass lowpass ms mono main source right channel main source speaker front swin acinr acinf off/on fc acout speaker rear speaker subwoofer d00au1155 left channel left channel second source second source 25k 50k 50k 50k 25k 25k 25k sec.s mono
TDA7402 audioprocessor part 29/71 4.13 subwoofer several different applications are possible with the subwoofer circuit: 1. subwoofer filter off a) main source stereo (ac coupled) b) second source stereo (dc coupled) c) main source mono differential (dc coupled) d) second source mono-differential (dc coupled) 2. subwoofer filter on a) main source mono differential (dc coupled) b) second source mono differential (dc coupled) c) center speaker mode (filtered mono signal at swl, unfiltered mono signal at swr) in all applications the phase of the output-signal can be configured to be 0 or 180 . in the center speaker mode only at the filtered output the phase is changed. figure 20. application 1 using internal highpass and mono low pass filter voice band bandpass bass-filter lowpass 220nf 220nf ms mono main source right channel main source speaker front swin acinr acinf off/on fc acout speaker rear speaker subwoofer d00au1156 left channel left channel second source second source 25k 50k 50k 50k 25k 25k 25k sec.s mono programming 5/1xxxxxxx 7/xxxxx1xx 10/xxxx10xx 12/1010xxxx
audioprocessor part TDA7402 30/71 figure 21. application 2 using internal highpass and external stereo low pass filter figure 22. application 3 using pure external filtering (e.g. dsp) 4.14 speaker attenuator and mixing a mixing-stage is placed after each speaker attenuator and can be set independly to mixing mode. having a full volume for the mix signal th e stage offers a wide flexibility to adapt the mixing levels. voice band bandpass external lowpass bass-filter lowpass 220nf ms mono main source right channel main source speaker front swin acinr acinf off/on fc acout speaker rear speaker subwoofer d00au1157 left channel left channel second source second source 25k 50k 50k 50k 25k 25k 25k sec.s mono programming 5/0xxxxxxx 7/xxxxx1xx 10/xxxx11xx 12/1010xxxx voice band bandpass external filtering bass-filter lowpass 220nf 220nf ms mono main source right channel main source speaker front swin acinr acinf off/on fc acout speaker rear speaker subwoofer d00au1163 left channel left channel second source second source 25k 50k 50k 50k 25k 25k 25k sec.s mono 220nf 220nf programming 5/1xxxxxxx 7/xxxxx0xx 10/xxxx11xx 12/1010xxxx
TDA7402 audioprocessor part 31/71 figure 23. output selector 4.15 audioprocessor testing during the testmode, which can be activated by setting bit d 0 of the stereo decoder testing byte and the audioprocessor testing byte, several internal signals are available at the fd2r pin. during this mode the input resistance of 100kohm is disconnected from the pin. the internal signals available are shown in the data byte specification. 1 outf 25k 25k 25k 25k front rear from mixing selector d00au1164 volume +15/-79db 1db step volume +15/-79db 1db step volume +15/-79db 1db step from output selector 1 outr
stereo decoder part TDA7402 32/71 5 stereo decoder part 5.1 features: no external components necessary pll with adjustment free, fully integrated vco automatic pilot dependent mono/stereo switching very high suppression of intermodulation and interference programmable roll off compensation dedicated rds-softmute highcut and stereo blend-characterisctics programmable in a wide range fm/am noiseblanker with several threshold controls multipath-detector with programmable internal/external influence i 2 c-bus control of all necessary functions 5.2 electrical characteristics v s = 9v, de-emphasis time constant = 50s, mpx input voltage v mpx = 500mv (75khz deviation), modulation frequency = 1khz, input gain = 6db, t amb = 27c, unless otherwise specified. table 7. electrical characteristics symbol parameter test condition min. typ. max. unit v in mpx input level input gain = 3.5db 0.5 1.25 v rms r in input resistance 70 100 130 k g min min. input gain 1.5 3.5 4.5 db g max max. input gain 8.5 11 12.5 db g step step resolution 1.75 2.5 3.25 db svrr supply voltage ripple rejection v ripple = 100mv, f = 1khz 55 db a max. channel separation 30 50 db thd total harmonic distortion f in =1khz, mono 0.02 0.3 % signal plus noise to noise ratio a-weighted, s = 2v rms 80 91 db mono/stereo-switch v pthst1 pilot threshold voltage for stereo, pth = 1 10 15 25 mv v pthst0 pilot threshold voltage for stereo, pth = 0 15 25 35 mv v pthmo1 pilot threshold voltage for mono, pth = 1 7 12 17 mv v pthmo0 pilot threshold voltage for mono, pth = 0 10 19 25 mv pll f/f capture range 0.5 % n s+n
TDA7402 stereo decoder part 33/71 de-emphasis and highcut deempfm de-emphasis timeconstants fm v level >> v hch 25 50 75 s v level >> v hch 44 62.5 80 s v level >> v hch 50 75 100 s v level >> v hch 70 100 130 s m fm highcut timeconstant multiplier fm v level << v hcl 3 deempam de-emphasis timeconstants am v level >> v hch 37.5 s v level >> v hch 47 s v level >> v hch 56 s v level >> v hch 75 s m am highcut timeconstant multiplier am v level << v hcl 3.7 ref5v internal reference voltage 4.7 5 5.3 v l min min. level gain -1 0 1 db l maxs max. level gain 5 6 7 db l gstep level gain step resolution see section 2.7 0.2 0.4 0.6 db vsbl min min. voltage for mono see section 2.8 17 20 23 %ref 5v vsbl max max. voltage for mono see section 2.8 62 70 78 %ref 5v vsbl step step resolution see section 2.8 1.6 3.3 5.0 %ref 5v vhch min min. voltage for no highcut see section 2.9 37 42 47 %ref 5v vhch max max. voltage for no highcut see section 2.9 58 66 74 %ref 5v vhch step step resolution see section 2.9 4.2 8.4 12.6 %ref 5v vhcl min min. voltage for full high cut see section 2.9 15 17 19 %vhch vhcl max max. voltage for full high cut see section 2.9 29 33 37 %vhch vhcl step step resolution see section 2.9 2.1 4.2 6.3 %ref 5v carrier and harmonic suppression at the output 19 pilot signal f=19khz 40 50 db 38 subcarrier f=38khz 75 db 57 subcarrier f=57khz 62 db 76 subcarrier f=76khz 90 db table 7. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
stereo decoder part TDA7402 34/71 de-emphasis and highcut deempfm de-emphasis timeconstants fm v level >> v hch 25 50 75 s v level >> v hch 44 62.5 80 s v level >> v hch 50 75 100 s v level >> v hch 70 100 130 s m fm highcut timeconstant multiplier fm v level << v hcl 3 deempam de-emphasis timeconstants am v level >> v hch 37.5 s v level >> v hch 47 s v level >> v hch 56 s v level >> v hch 75 s m am highcut timeconstant multiplier am v level << v hcl 3.7 ref5v internal reference voltage 4.7 5 5.3 v l min min. level gain -1 0 1 db l maxs max. level gain 5 6 7 db l gstep level gain step resolution see section 2.7 0.2 0.4 0.6 db vsbl min min. voltage for mono see section 2.8 17 20 23 %ref 5v vsbl max max. voltage for mono see section 2.8 62 70 78 %ref 5v vsbl step step resolution see section 2.8 1.6 3.3 5.0 %ref 5v vhch min min. voltage for no highcut see section 2.9 37 42 47 %ref 5v vhch max max. voltage for no highcut see section 2.9 58 66 74 %ref 5v vhch step step resolution see section 2.9 4.2 8.4 12.6 %ref 5v vhcl min min. voltage for full high cut see section 2.9 15 17 19 %vhch vhcl max max. voltage for full high cut see section 2.9 29 33 37 %vhch vhcl step step resolution see section 2.9 2.1 4.2 6.3 %ref 5v carrier and harmonic suppression at the output 19 pilot signal f=19khz 40 50 db 38 subcarrier f=38khz 75 db 57 subcarrier f=57khz 62 db 76 subcarrier f=76khz 90 db table 7. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
TDA7402 stereo decoder part 35/71 5.3 notes about the characteristics 5.3.1 intermodulation suppression measured with: 91% pilot signal; fm = 10khz or 13khz. 5.3.2 traffic radio (v.f.) suppression measured with: 91% stereo signal; 9% pilot signal; fm=1khz; 5% subcarrier (f=57khz, fm=23hz am, m=60%) 5.3.3 sca (subsidiary comm unications authorization) measured with: 81% mono signal; 9% pilot signal; fm=1khz; 10%sca - subcarrier ( f s = 67khz, unmodulated ). intermodulation (note 2.3.1) 2 f mod =10khz, f spur =1khz 65 db 3 f mod =13khz, f spur =1khz 75 db traffic radio (note 2.3.2) 57 signal f=57khz 70 db sca - subsidiary communications authorization (note 2.3.3) 67 signal f = 67khz 75 db aci - adjacent channel in terference (note 2.3.4) 114 signal f=114khz 95 db 190 signal f=190khz 84 db table 7. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit 2 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- f s ; 210khz ? () 19khz ? == 3 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- f s ; 313khz ? () 38khz ? == 57 v.w.f () v o signal () at1khz () v o spurious () at1khz 23khz () ---------------------------------------------------------------------------------------- - = 67 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- f s ; 238khz ? () 67khz ? ==
stereo decoder part TDA7402 36/71 5.3.4 aci (adjacent channel interference) measured with: 90% mono signal; 9% pilot signal; fm=1khz; 1% spurious signal ( f s = 110khz or 186khz, unmodulated). 5.4 noise blanker part 5.4.1 features: am and fm mode internal 2nd order 140khz high-pass filter for mpx path internal rectifier and filters for am-if path programmable trigger thresholds trigger threshold dependent on high frequency noise with programmable gain additional circuits for deviation and fieldstrength dependent trigger adjustment 4 selectable pulse suppression times for each mode programmable noise rectifier charge/discharge current all parameters measured in fm mode if not otherwise specified. 114 v o signal () at1khz () v o spurious () at4khz () ---------------------------------------------------------------- f s ; 110khz 3 38khz ? () ? == 190 v o signal () at1khz () v o spurious () at4khz () ---------------------------------------------------------------- f s ; 186khz 5 38khz ? () ? == table 8. electrical characteristics symbol parameter test condition min. typ. max. unit v tr trigger threshold (1) meas.with v peak =0.9v 111 30 mv op 110 35 mv op 101 40 mv op 100 45 mv op 011 50 mv op 010 55 mv op 001 60 mv op 000 65 mv op v trnoise noise controlled trigger threshold meas.with v peak =1.5v 00 260 mv op 01 220 mv op 10 180 mv op 11 140 mv op
TDA7402 stereo decoder part 37/71 v rect rectifier voltage v mpx =0mv 0.5 0.9 1.3 v v mpx =50mv, f=150khz 1.5 1.7 2.1 v v mpx =200mv, f=150khz 2 2.5 2.9 v v rect de v deviation dependent rectifier voltage meas.with v mpx =500mv (75khz dev.) 11 10 01 00 0.5 0.9 1.7 2.5 0.9(off) 1.2 2.0 2.8 1.3 1.5 2.3 3.1 v op v op v op v op v rect fs fieldstrength controlled rectifier voltage meas.with v mpx =0mv, v level << v sbl (fully mono) 11 10 01 00 0.5 0.9 1.7 2.1 0.9(off) 1.4 1.9 2.4 1.3 1.5 2.3 3.1 v v v v t sfm suppression pulse duration fm signal holdn in testmode 00 01 10 11 38 25.5 32 22 s s s s t sam suppression pulse duration am signal holdn in testmode 00 01 10 11 1.2 800 1.0 640 ms s s s v rectad j noise rectifier discharge (2) adjustment signal peak in testmode 00 01 10 11 0.3 0.8 1.3 2.0 v/ms sr peak noise rectifier (2) charge signal peak in testmode 0 1 10 20 mv/s v adjmp noise rectifier adjustment through multipath (2) signal peak in testmode 00 01 10 11 0.3 0.5 0.7 0.9 v/ms r amif am if input resistance 35 50 65 kohm g amif,min min. gain am if signal am-rectifier in te s t m o d e 6db g amif,max max. gain am if 20 db g amif,step step gain am if 2 db f amif,min min. f c am if signal am-rectifier in te s t m o d e 14 khz f amif,max max. f c am if 56 khz 1. all thresholds are measured using a pulse with tr = 2 s, thigh= 2 s and tf = 10 s. the repetition rate must not increase the peak voltage. 2. by design/characterization f unctionally guaranteed through dedicated test mode structure table 8. electrical characteristics symbol parameter test condition min. typ. max. unit
stereo decoder part TDA7402 38/71 figure 24. vn timing diagram figure 25. trigger threshold vs. v peak figure 26. deviation controlled trigger adjustment figure 27. field strength controlled trigger adjustment time v in t r t high t f v op dc vth min. trig. threshold noise controlled trig. threshold 1.5v 0.9v 260mv (00) 220mv (01) 180mv (10) 140mv (11) 8 steps 65m v 30m v v peak [v] 0.9 deviation [khz] 2.8 2.0 1.2 20 32.5 45 75 v peak 00 01 10 d etector off (11) [v ] op 0.9v noisy signal good signal noise 2.3v (00) mono stereo 1.8v (01) 1.3v (10) atc_sb off (11) e' v peak ? 3v
TDA7402 stereo decoder part 39/71 5.5 multipath detector 5.5.1 features: internal 19khz band pass filter programmable band pass and rectifier gain selectable internal influence on stereo blend and/or highcut table 9. electrical characteristics of multipath detector symbol parameter test condition min. typ. max. unit f cmp center frequency of multipath-bandpass stereo decoder locked on pilot tone 19 khz g bpmp bandpass gain g1 6 db g2 12 db g3 16 db g4 18 db g rectm p rectifier gain g1 7.6 db g2 4.6 db g3 0 db i chmp rectifier charge current 0.25 0.5 a i dismp rectifier discharge current 4 ma quality detector amultipath influence factor 00 01 10 11 0.70 0.85 1.00 1.15
functional description of stereo decoder TDA7402 40/71 6 functional description of stereo decoder figure 28. block diagram of stereo decoder the stereo decoder-part of the a619 (see figure 28 ) contains all functions necessary to demodulate the mpx-signal like pilot tone dependent mono/stereo switching as well as "stereo blend" and "highcut". adaptations like programmable input gain, roll off compensation, selectable de-emphasis time constant and a programmable fieldstrength input allow to use different if devices. 6.1 stereo decoder mute the a619 has a fast and easy to control rds mute function which is a combination of the audioprocessor's softmute and the high ohmic mute of the stereo decoder. if the stereo decoder is selected and a softmute command is sent (or activated through the sm-pin) the stereo decoder will be set automa tically to the high-ohmic mu te condition after the audio- signal has been softmuted. hence a checking of alternate frequencies could be performed. additionally the pll can be set to "hold" m ode, which disables the pll input during the mute time. to release the system from the mute condition simply the unmute command must be sent: the stereo decoder is unmuted immediately and the audioprocessor is softly unmuted. fig. 26 shows the output-signal v o as well as the internal stereo decoder mute signal. this influence of softmute on the stereo decoder mute can be switched off by setting bit 3 of the softmute byte to "0". a stereo decoder mute command (bit 0, stereo decoder byte set to "1") will also set the stereo decode r independently to the high-ohmic mute state. if any other source than the stereo decoder is selected the decoder remains muted and the mpx pin is connected to v ref to avoid any discharge of the coupling capacitor through leakage currents. no further mute command should be applied. ingain 3.5 ... 11db step 2.5db infilter lp 80khz 4.th order demodulator - plot canc - roll-off comp. - lp 25khz pll + pilot-det. f19 noise blanker f38 stereo holdn noise sb control multipath det. deemphasis + highcut t=50.62..5.75,100 s (37.5,47,56,75 s) ref 5v vsbl mphcinfl mphcout mpsbout hc control vhcch vhccl d 5 bits a level input levelsb-lp level mpsbinfl fm_l fm_r mpx 100k am am-if 100k d00au1135 levelhc-lp gain 0..6db quality detector qual mp-out mp-in - - +
TDA7402 functional description of stereo decoder 41/71 figure 29. signals during stereo decoder's softmute figure 30. signal control via softmute pin 6.2 ingain + infilter the ingain stage allows adjustment of the mpx-signal to a magnitude of about 1v rms internally, which is the recommended value. the 4th order input filter has a corner frequency of 80khz and is used to attenuate spikes and noise, and acts as an anti-aliasing filter for the following switch capacitor filters. 6.3 demodulator in the demodulator block, the left and the right channels are separated from the mpx signal. in this stage the 19khz pilot tone is cancelled. to reach a high channel separation the a619 offers an i 2 c bus programmable roll-off adjustment which is able to compensate for the lowpass behavior of the tuner section. if the tuner's attenuation at 38khz is in a range from 7.2% to 31.0%, the a619 needs no external network in front of the mpx-pin. within this range, an adjustment to obtain at least 40db channel separation is possible. the bits for this adjustment are located together with the fieldstrength adjustment in one byte. this gives the possibility to perform an optimization step dur ing the producti on of the car radio, where the mp-hold softmute pin d00au1165 softmute pll-hold pll-hold influence stdhmute muted stdhmute influence softmute influence iic-bus softmute influence
functional description of stereo decoder TDA7402 42/71 channel separation and the fieldstrength control are trimmed. the setup of the stereo blend characteristics which is programmable in a wide range is described in chapter 6.8 . 6.4 de-emphasis and highcut the de-emphasis lowpass allows to choose a time constant between 37.5 and 100s. the highcut control range will be 2 x deemp or 2.7 x deemp dependent on the selected time constant (see programming section). the bit d7 of the hightcut-byte will shift timeconstant and range. inside the highcut control rang e (between vhch and vhcl) the level signal is converted into a 5 bit word which controls the lowpass time constant between deemp ...3 (3.7) x deemp . thereby the resolution will remain always 5 bits independently of the absolute voltage range between the vhch and vhcl values. in addition the maximum attenuation can be fixed between 2 and 10db. the highcut function can be switched off by i 2 c bus (bit d 7 , highcut byte set to "0"). the setup of the highcut characteristics is described in chapter 6.9 . 6.5 pll and pilot tone detector the pll has the task to lock on the 19khz pilot tone during a stereo transmission to allow a correct demodulation. the included pilot tone-detector enables the demodulation if the pilot tone reaches the selected pilot tone threshold v pthst . two different thresholds are available. the detector output (signal stereo, see the block diagram) can be checked by reading the status byte of the a619 via i 2 c-bus. during a softmute the pll can be set into "hold"-mode which freezes the pll's state (bit d 4 , softmute byte). after releasing the softmute the pll will again follow the input si gnal only by correcting the phase error. 6.6 field strength control the fieldstrength input is used to control the highcut and the stereo blend function. in addition the signal can be also used to control the noiseblanker thresholds and as input for the multipath detector. these additional functions are described in sections 6.3 and 7 . 6.7 evel input and gain to suppress undesired high frequency modulation on the highcut- and stereo blend-control signal the level signal is lowpa ss filtered firstly. the filter is a combination of a 1st order rc lowpass at 53khz (working as anti-aliasing filter) and a 1st-order switched capacitor lowpass at 2.2khz. the second stage is a pr ogrammable gain stage to adapt the level signal internally to different if devices (s ee testmode section 5: levelhcc). the gain is widely programmable in 16 steps from 0db to 6db (step=0.4db). these 4 bits are located together with the roll-off bits in the "stereo decoder adjustment" byte to simplify a possible adjustment during the production of the car radio. this signal controls directly the highcut stage whereas the signal is filtered again (fc=100hz) before the stereo blend stage (see figure 35 ).
TDA7402 functional description of stereo decoder 43/71 6.8 stereo blend control the stereo blend cont rol block converts the internal level voltage (levelsb) into an demodulator compatible analog signal which is used to control the channel separation between 0db and the maximum separation. internally this control range has a fixed upper limit which is the internal reference voltage ref5v. the lower limit can be programmed between 20 and 70% of ref5v in 3.3% steps (see figure 31 and 32 ). to adjust the external level voltage to the inte rnal range two values must be defined: the level gain l g and vsbl (see figure 32 ). at the point of full channel separation the external level signal has to be amplified that internally it becomes equal to ref5v. the second point (e.g. 10db c hannel sep.) is then adju sted with the vsbl voltage. figure 31. internal stereo blend characteristics the gain can be programmed through 4 bits in the "stereo decoder adjustment" byte. all necessary internal reference voltages like ref5v are derived from a bandgap circuit. therefore they have a temperature co-efficient near zero. figure 32. relation between internal and external level voltages for setup of stereo blend 6.9 highcut control the highcut control set-up is similar to the stereo blend control set up : the starting point vhch can be set with 2 bits to be 42, 50, 58 or 66% of ref5v whereas the range can be set to be 17, 22, 28 or 33% of vhch (see figure 33 ). internal voltages t d00au1168 vsbl ref 5v setup of vst internal voltages t 20% ref 5v setup of vmo level level intern fieldstrenght voltage vst vmo level intern 70% vsbl vst vmo fieldstrenght voltage
functional description of stereo decoder TDA7402 44/71 figure 33. highcut characteristics lowpass time constant d00au1169 ' deemp deemp fieldstrenght deemphasis shift on off vhch vhcl 3.7 ? ' deemp 3 ? deemp
TDA7402 functional description of the noise blanker 45/71 7 functional description of the noise blanker in the automotive environment the mpx-signal as well as the am signal is disturbed by spikes produced by the ignition and other radiating sources like the wiper motor. the aim of the noiseblanker part is to cancel the audible influence of the spikes. therefore the output of the stereo decoder is held at the actual voltage for a time between 22 and 38s in fm (370 and 645s in am mode). the block diagram of the noise blanker is given in figure 34 . figure 34. block diagram of the noise blanker in a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise a complex trigger control is implemented. behind the trigger stage a pulse former generates the "blanking"pulse. 7.1 trigger path fm the incoming mpx signal is highpass-filtered, amplified and rectified. this second order highpass filter has a corner-frequency of 140khz. the rectified signal, rect, is integrated (lowpass filtered) to generate a signal called peak. the dc-charge /discharge behaviour can be adjusted as well as the transient behaviour (mp discharge control). also noise with a frequency 140khz in creases the peak voltage. the peak vo ltage is fed to a threshold generator, which adds to the peak voltage a dc dependent threshold vth. both signals, rect and peak+vth are fed to a comparator wh ich triggers a re-triggerable monoflop. the monoflop's output activates the sample and hold circuits in the signalpath for the selected duration. 7.2 noise controlled thre shold adjustment (nct) there are mainly two independent possibilities for prog ramming the trig ger threshold: 1. the low threshold in 8 steps (bits d 1 to d 3 of the noiseblanker byte i) 2. and the noise adjusted threshold in 4 steps (bits d 4 and d 5 of the noiseblanker byte i, see figure 21 ). the low threshold is activ in combination with a good mpx signal without noise; the peak voltage is less than 1v. the sensitivity in this operation is high. if the mpx signal is noisy (low fieldstrength) the peak voltage increas es due to the higher noise, which is also rectified. with increa sing of the peak voltage the trigger threshold increases, too. this gain is programmable in 4 steps (see figure 25 ). + - rectifier am/fm integrator discharge control fm: 22 to 40 s am: 370 to 6400 s rect + + threshold generator vth peak additional threshold control monoflop holdn amif d00au1132 rectifier + 14-56khz lpf (1st. order) 140khz hpf (1st. order) 140khz hpf (2nd. order) mpx mpout
functional description of the noise blanker TDA7402 46/71 7.3 additional threshold control mechanism 7.3.1 automatic threshold contro l by the stereo blend voltage besides the noise controlled th reshold adjustment there is an additional possibility for influencing the trigger threshold which depends on the stereo blend control. the point where the mpx signal starts to become noisy is fixed by the rf part. therefore also the starting point of the normal noise-controlled trigger adjustment is fixed ( figure 27 ). in some cases the behavior of the noiseblanker can be improved by increasing the threshold even in a region of higher fieldstrength. sometimes a wrong triggering occurs for the mpx signal often shows distortion in this range which can be avoided even if using a low threshold. because of the overlap of this range and the range of the stereo/mono transition it can be controlled by stereo blend. this increase of the threshold is programmable in 3 steps or switched off. 7.3.2 over deviation detector if the system is tuned to stations with a high deviation the noiseblanker can trigger on the higher frequencies of the modulation or distor tion. to avoid this behavior, which causes audible noise in the output signal, the noiseblanker offers a deviation-dependent threshold adjustment. by rectifying the mpx signal a furt her signal representing the actual deviation is obtained. it is used to increase the peak voltage. offset and gain of this circuit are programmable in 3 steps with the bits d 6 and d 7 of the noiseblanker byte i (bit combination '00' turns off the detector, see figure 26 ). 7.3.3 multipath level to react on high repetitive spikes caused by a multipath-situation, the discharge time of the peak voltage can be decreased depending on the vo ltage-level at pin mpout. the a619 offers a linear as well as a threshold driven control. the linear influence of the multipath level on the peak-signal (d 7 of multipath control byte) gives a discharge slewrate of 1v/ms (1) . the second possibility is to activate the thre shold driven discharge which switches on the 18kohm discharge if the multipath level is below 2.5v (d 7 of noiseblanker byte ii byte). (1) the slewrate is measured with rd ischarge=infinite and vmpout=2.5v 7.3.4 am mode of the noiseblanker the a619 noiseblanker is also suitable for am noise cancelling. the de tector uses in am mode the 450khz unfiltered if output of the tuner for spike detection. a combination of programmable gain stage and lowpass filter forms an envelope detector which drives the noiseblanker's input via a 120khz 1st order highpass. in order to blank the whole spike in am mode the hold-times of the sample and hold circuit are much longer then in fm (640s to 1.2ms). all threshold controls can be used like in fm mode.
TDA7402 functional description of the multipath detector 47/71 8 functional description of the multipath detector using the multipath detector the audible effects of a multipath condition can be minimized. a multipath condition is detected by rectifying the spectrum around 19khz in the fieldstrength signal. an external capacitor is used to de fine the attack and decay times for the stereo blend (see block diagram, figure 34 ). due to the very small charge currents this capacitor should be a low leakage current type (e.g ceramic). using this configuration an adaptation to the user's requirement is possible without effecting the "normal" fieldstrength input (level) for the stereo decoder. this application is given in figure 34 . another (internal) time constant is used to control the highcut through the multipath detector selecting the "internal influence" in the configuration byte the stereo-blend and/or the highcut is automatically invoked during a multipath condition according to the voltage appearing at the mp_out pin. figure 35. block diagram of the multipath detector 8.1 quality detector the a619 offers a quality detector output which gives a voltage representing the fm reception conditions. to calculate this voltage the mpx-noise and the multipath-detector output are summed according to the following formula : v qual = 1.6 (v noise -0.8 v)+ a (ref5v-v mpout ). the noise-signal is the peak signal without a dditional influences (see the noiseblanker description). the factor 'a' can by programmed to 0.7 .... 1.15. the output is a low impedance output able to drive external circuitry as well as simply fed to an ad converter for rds applications. int. influence charge 0.25 a/0.5 a fast charge 300 a level d00au1166 lowpass 2.2khz bandpass 19khz rectifier shift 0 ... 1.5v lowpass 100hz = = lowpass 53khz int. influence mp hold gain 2 bits gain 2 bits mp_in to hcc to sb 470nf mp_out vdd vdd = vdd high-cut-infl. attach<500 s decay=2/10ms stereoblend-infl. attach=1ms decay=4/8s
functional description of the multipath detector TDA7402 48/71 8.2 testmode during the testmode, which can be activated by setting bit d 0 and bit d 1 of the stereo decoder testing byte, several internal signals are available at the fd2r+ pin. during this mode the input resistance of 100kohm is disconnected from the pin. the internal signals available are shown in the data byte sp ecification. 8.3 dual mpx usage 8.3.1 feature description the a619 is able to support a twin tuner concept via the dual mpx mode. in this configuration the mpx pin and the md2g pin are acting as mpx1 and mpx2 inputs. the dc voltage at the md2 pin controls whether one or both mpx signals are used to decode the stereo fm signal. it is designed as a window comparator with the characteristic shown in figure 3 (please note that the thresholds have a hysteresis of 500mv). in this mode the stereo decoder high ohmic-mute mutes both inputs in parallel. figure 36. dual mpx input diagram 8.3.2 configuration the dual mpx mode can be easily configured by setting bit 3 of subaddress 30 to low (see byte 30 description and application diagram of figure 38 ). control circuitry ingain 100k 40k 40k 100k 3.5...11db step 2.5db mpx/ mpx1 d00au1167 1 md2g/ mpx2 md2/ control 1 1
TDA7402 i 2 c bus interface 49/71 9 i 2 c bus interface 9.1 interface protocol the interface protocol comprises: a start condition (s) a chip address byte (the lsb bit determines read / write transmission) a subaddress byte a sequence of data (n-bytes + acknowledge) a stop condition (p) s = start r/w = "0" -> receive-mode (chip could be programmed by p) "1" -> transmission-mode (data could be received by p) ack = acknowledge p = stop max clock speed 500kbits/s 9.2 auto increment if bit i in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled. 9.3 transmitted data (send mode) sm = soft mute activated st = stereo p = pause x = not used the transmitted data is automatically updated after each ack. transmission can be repeated without new chipaddress. a power-on-reset is invoked if the supply voltage is below than 3.5v. after that the following data is written automatically into the registers of all subaddresses : the programming after por is marked bold-face / underlined in the programming tables. with this programming all the outputs are muted to v ref (v out = v dd /2). chip address subaddress data 1....data n msb lsb msb lsb msb lsb s 1 0001 10 r/w ack c az i aaaaaack data ackp table 10. transmitted data (send mode) msb lsb xxxxxpstsm table 11. reset condition msb lsb 1 1111 110
i 2 c bus interface TDA7402 50/71 9.4 subaddress (receive mode) table 12. subaddress (receive mode) msb lsb function i 2 i 1 i 0 a 4 a 3 a 2 a 1 a 0 0 1 compander hold off on 0 1 autozero remain off on 0 1 auto increment mode off on 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 subaddress main source selector main loudness volume tr e bl e bass mixing programming softmute voice-band second source selector second source loudness subwoofer config. / bass compander configuration audioprocessor i configuration audioprocessor ii subwoofer attenuator l subwoofer attenuator r speaker attenuator lf speaker attenuator rf speaker attenuator lr speaker attenuator rr mixing level control testing audioprocessor stereo decoder noise-blanker i noise-blanker ii am / am-noiseblanker high-cut control fieldstr. & quality multipath-detector stereo decoder adjustment configuration stereo decoder testing sterodecoder
TDA7402 i 2 c bus interface 51/71 9.5 data byte specification the status after power on reset is marked bold face / underlined in the programming tables. table 13. main selector (0) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 source selector fd1 / se2 se3 fd2 se1 md2 md1 / se4 stereo decoder am 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 input gain 0db 1db : 14db 15db 0 1 mute off on table 14. main loudness (1) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 0 0 : 1 : 0 0 : 1 1 : 0 : 0 0 : 1 1 : 0 : 0 0 : 1 1 : 1 : 0 1 : 0 1 : 1 : attenuation 0 db -1 db : -14 db -15 db : -19 db not allowed 0 0 1 1 0 1 0 1 center frequency 200hz 400hz 600hz 800hz 0 1 loudness order first order second order
i 2 c bus interface TDA7402 52/71 note: it is not recommended to use a gain more than 20db for system performance reason. in general, the maximum gain shou ld be limited by software to the maximum value, which is needed for the system. table 15. volume (2) msb lsb attenuation d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 0 0 0 : 0 0 0 : 1 1 0 0 : 0 0 0 : 0 1 1 : 1 1 0 0 : 0 0 0 : 1 0 0 : 0 0 0 0 : 1 1 1 : 1 0 0 : 1 1 0 0 : 1 1 1 : 1 0 0 : 1 1 0 0 : 0 0 0 : 1 0 0 : 1 1 0 0 : 0 0 1 : 1 0 0 : 1 1 0 1 : 0 1 0 : 1 0 1 : 0 1 gain/attenuation (+32.0db) (+31.5db) : +20 .0db +19.5db +19.0db : +0.5db 0.0db -0.5db : -79.0db -79.5db table 16. treble filter (3) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 treble steps -15db -14db : -1 db 0 db 0 db +1 db : +14 db +15db 0 0 1 1 0 1 0 1 treble center frequency 10.0 khz 12.5 khz 15.0 khz 17.5 khz 0 1 subwoofer + center speaker mode on off
TDA7402 i 2 c bus interface 53/71 table 17. bass filter (4) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 bass steps -15db -14db : -1 db 0 db 0 db +1 db : +14 db +15db 0 0 1 1 0 1 0 1 bass q-factor 1.0 1.25 1.5 2.0 0 1 bass dc-mode off on table 18. mixing programming (5) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 mixing mute enable 0 0 1 1 0 1 0 1 mixing source beep md1 md2 fm mono 0 1 0 1 0 1 0 1 mixing target speaker lf off speaker lf on speaker rf off speaker rf on speaker lr off speaker lr on speaker rr off speaker rr on 0 1 stereo subw. using internal highpass filter on off
i 2 c bus interface TDA7402 54/71 table 19. soft mute (6) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 1 1 0 1 0 1 0 1 softmute on (mute) off mutetime = 0.48ms mutetime = 0.96ms mutetime = 123ms mutetime = 324 ms 0 1 influence on stereo decoder highohmic mute on off 0 1 influence on pilot detector hold and mp hold on off 0 1 influence on softmute on off 0 0 1 1 0 1 0 1 beep frequencies 600 hz 780 hz 1.56 khz 2.4 khz table 20. voiceband (7) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 voice band low pass enable filter off filter on 0 1 voice band low pass frequency 3 khz 6 khz 0 1 voice band high pass enable filter off filter on
TDA7402 i 2 c bus interface 55/71 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 high pass cut off frequency 90hz 135hz 180hz 215hz 300hz 450hz 600hz 750hz 0 1 anti clipping enable on off 0 1 anti clipping input mp-in am table 21. second source selector (8) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 source selector fd1 / se2 se3 fd2 se1 md2 md1 / se4 stereo decoder am 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 input gain 0db 1db : 14db 15db 0 1 mute off on table 20. voiceband (7) (continued) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0
i 2 c bus interface TDA7402 56/71 table 22. second loudness (9) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 0 0 : 1 : 0 0 : 1 1 : 0 : 0 0 : 1 1 : 0 : 0 0 : 1 1 : 1 : 0 1 : 0 1 : 1 : attenuation 0 db -1 db : -14 db -15 db : -19 db not allowed 0 0 1 1 0 1 0 1 center frequency 200hz 400hz 600hz 800hz 0 1 loudness order first order second order table 23. subwoofer configuration / bass (10) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 1 1 0 1 0 1 subwoofer filter off 80hz 120hz 160hz 0 1 subwoofer outputs differential (mono) single ended (stereo) 0 1 subwoofer source second source main source 0 1 subwoofer phase 180 0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 bass center frequency 60hz 80hz 70hz 90hz 100hz 130hz 150hz 200hz
TDA7402 i 2 c bus interface 57/71 note: the softstep times are only programmable while the compander is not in use. table 24. compander (11) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 1 1 0 1 0 1 activity / reference level off 0.5v rms 1v rms 2v rms 0 0 1 1 0 1 0 1 attack-times 6ms 12ms 24ms 49ms 0 0 1 1 0 1 0 1 release-times 390ms 780ms 1.17s 1.56s 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 0 0 1 1 0 1 0 1 softstep-time 1) 160s 320s 640s 1.28ms 2.56ms 5.12ms 10.2ms 20.4ms 0 1 compander max. gain 29db 19db table 25. configuration audioprocessor i (12) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 compander source main selector second source selector 0 1 softstep off on
i 2 c bus interface TDA7402 58/71 0 1 main loudness flat filter on 0 1 second loudness flat filter on 0 0 1 1 0 1 0 1 front speaker not allowed second source internal coupled main source ac coupled main source internal coupled 0 0 1 1 0 1 0 1 rear speaker not allowed second source internal coupled main source ac coupled main source internal coupled table 26. configuration audioprocessor ii (13) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 pause detector off on 0 0 1 1 0 1 0 1 pause zc window 160mv 80mv 40mv not allowed 0 1 fd1 mode single ended differential 0 0 1 1 0 1 0 1 fd1 attenuation -12db -6db -6db 0db table 25. configuration audioprocessor i (12) (continued) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0
TDA7402 i 2 c bus interface 59/71 the programming of all speaker, subwoofer and mixing level controls are the same. 0 1 fd2 attenuation -6db 0db 0 1 md1 mode single ended differential table 27. speaker, subwoofer and mixer level-control (14-20) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 1 : 1 1 0 0 : 0 0 : 0 0 x 0 : 0 0 0 0 : 0 0 : 1 1 1 0 : 0 0 0 0 : 0 0 : 0 0 1 0 : 0 0 0 0 : 0 1 : 0 0 x 1 : 0 0 0 0 : 1 0 : 1 1 x 1 : 0 0 0 0 : 1 0 : 1 1 x 1 : 0 0 0 0 : 1 0 : 1 1 x 1 : 1 0 0 1 : 1 0 : 0 1 x +15 db : +1 db 0 db 0 db -1 db : -15 db -16 db : -78 db -79 db mute table 26. configuration audioprocessor ii (13) (continued) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0
i 2 c bus interface TDA7402 60/71 note: this byte is used for testing or evaluation purposes only an d must not set to other values than " 11101110 " in the application! table 28. testing audioprocessor (21) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 audioprocessor testmode off on 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 test-multiplexer compander log amp. output compander low pass output compander dac output 200khz oscillator not allowed not allowed nb-hold internal reference 0 1 compander testmode off on 0 1 clock external internal 0 1 az function off on 0 1 sc-clock fast mode normal mode table 29. stereo decoder (22) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 std unmuted std muted 0 0 1 1 0 1 0 1 in-gain 11 db in-gain 8.5 db in-gain 6 db in-gain 3.5 db 0 1 input am pin input mpx pin
TDA7402 i 2 c bus interface 61/71 note: if de-emphasis-shift enabled (subaddr.26/bit7 = 0) 0 1 forced mono mono/stereo switch automatically 0 1 pilot threshold high pilot threshold low 0 0 1 1 0 1 0 1 de-emphasis 50s (37.5s 1 ) de-emphasis 62.5s (46.9s 1 ) de-emphasis 75s (56.3s 1 ) de-emphasis 100s (75s 1 ) table 29. stereo decoder (22) (continued) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 table 30. noise blanker i (23) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 noise blanker off noise blanker on 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 low threshold 65mv low threshold 60mv low threshold 55mv low threshold 50mv low threshold 45mv low threshold 40mv low threshold 35mv low threshold 30mv 0 0 1 1 0 1 0 1 noise controlled threshold 320mv noise controlled threshold 260mv noise controlled threshold 200mv noise controlled threshold 140mv 0 0 1 1 0 1 0 1 overdeviation adjust 2.8v overdeviation adjust 2.0v overdeviation adjust 1.2v overdeviation detector off
i 2 c bus interface TDA7402 62/71 table 31. noiseblanker ii (24) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 peak charge current low high 0 0 1 1 0 1 0 1 fieldstrength adjust 2.3v 1.8v 1.3v off 0 0 1 1 0 1 0 1 blank time fm / am 38s / 1.2ms 25.5s / 800s 32s / 1.0s 22s / 640s 0 0 1 1 0 1 0 1 noise rectifier discharge resistor r = infinite r dc = 56k r dc = 33k r dc = 18k 0 1 strong multipath influence on peak 18k off on (18k discharge if v mpout < 2.5v) table 32. am / fm noiseblanker (25) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 stereo decoder mode fm am 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 am rectifier gain 6db 8db 10db 12db 14db 16db 18db 20db
TDA7402 i 2 c bus interface 63/71 0 0 1 1 0 1 0 1 rectifier cut off frequency 14.0khz 18.5khz 28.0khz 56.0khz 1 1 must be "1" table 33. high cut (26) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 high cut off on 0 0 1 1 0 1 0 1 max. high cut 2db 5db 7db 10db 0 0 1 1 0 1 0 1 vhch to be at 42% ref5v 50% ref5v 58% ref5v 66% ref5v 0 0 1 1 0 1 0 1 vhcl to be at 16.7% vhch 22.2% vhch 27.8% vhch 33.3% vhch 0 1 de-emphasis shift on off table 32. am / fm noiseblanker (25) (continued) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0
i 2 c bus interface TDA7402 64/71 table 34. fieldstrength control (27) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 vsbl to be at 20.0% ref5v 23.3% ref5v 26.6% ref5v 30.0% ref5v 33.3% ref5v 36.6% ref5v 40.0% ref5v 43.3% ref5v 46.6% ref5v 50.0% ref5v 53.3% ref5v 56.6% ref5v 60.0% ref5v 63.3% ref5v 66.6% ref5v 70.0% ref5v 0 0 1 1 0 1 0 1 quality detector co-efficient a=0.7 a=0.85 a=1.0 a=1.15 0 0 1 1 0 1 0 1 hcc level shift (only level through mpd) 0.0v 500mv 1.0 v 1.5 v table 35. multipath detector (28) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 fast load on off 0 0 1 1 0 1 0 1 bandpass gain 6db 12db 16db 18db
TDA7402 i 2 c bus interface 65/71 0 0 1 1 0 1 0 1 rectifier gain gain = 7.6db gain = 4.6db gain = 0db disabled 0 1 charge current at mp out 0.25a 0.50a 0 1 multipath on high cut decay time 2ms 10ms 0 1 multipath influence on peak discharge off -1v/ms table 36. stereo decoder adjustment (29) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 : 0 : 0 1 1 1 : 1 : 1 0 0 0 : 1 : 1 0 0 0 : 1 : 1 0 0 1 : 0 : 1 0 0 1 : 0 : 1 0 1 0 : 0 : 1 0 1 0 : 0 : 1 roll off compensation not allowed 7.2% 9.4% : 13.7% : 20.2% not allowed 19.6% 21.5% : 25.3% : 31.0% 0 0 0 : 1 0 0 0 : 1 0 0 1 : 1 0 1 0 : 1 level gain 0db 0.4db 0.8db : 6db table 35. multipath detector (28) (continued) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0
i 2 c bus interface TDA7402 66/71 note: using the multipath time-constants for stereo bland and high cut table 37. stereo decoder configuration (30) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 multipath influence on high cut on off 0 1 multipath influence on stereo blend on off 0 1 1 x 1 x level input over multipath detector 1 on off 0 1 dual mpx mode on off 1 1 1 1 1 must be "1" table 38. testing stereo decoder (31) msb ls b function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 main testmode off on 0 1 stereo decoder testmode off on
TDA7402 i 2 c bus interface 67/71 note: this byte is used for testing or evaluation purposes only an d must not set to other values than " 11111100 " in the application! 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 test signals f228 nb threshold level for stereo blend pilot magnitude vhccl pilot threshold vhcch ref5v holdn nb peak am rectifier vcocon; vco control voltage vsbl pilot threshold level for high cut ref5v 0 1 audioprocessor oscillator off on 1 must be "1" table 38. testing stereo decoder (31) (continued) msb ls b function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0
application information TDA7402 68/71 10 application information figure 37. application diagram (standard configuration) figure 38. application diagram (dual mpx mode) 220nf 1 2 3 4 5 6 7 8 9 10 11 sel ser fd1l+ fd1l- fd1r+ fd1r- fd2l+ fd2l- fd2r+ fd2r- am sel ser fd1l+ fd1l- fd1r+ fd1r- fd2l+ fd2l- fd2r+ fd2r- vdd am 220nf 220nf 220nf 220nf 220nf 220nf 220nf 470nf 470nf 220nf 220nf 220nf 220nf 220nf 13 mpx1 mpx 220nf 100nf vb1 9 16 mpout 470nf outssr outssr d00au1161 22 12 23 amif amif 220nf 14 level level 15 mpin mpin qual gnd qual 18 sm smute 20 sda sda 21 scl scl 17 = + - outssl outssl 24 outswr outswr 25 outswl outswl 26 outrr outrr 27 outrf outrf 28 outlr outlr 29 outlf acinrr acinrf acinlr acinlf swinl swinr outlf 30 acoutr acoutr 37 36 35 10 f cref 39 220nf md1 41 220nf md1g md1 md1g 42 47nf mux 40 33 31 32 acoutl mux pause md2 220nf 220nf md2g md2g 44 md2 43 acoutl 38 19 34 100nf 1 2 3 4 5 6 7 8 9 10 11 sel ser fd1l+ fd1l- fd1r+ fd1r- fd2l+ fd2l- fd2r+ fd2r- am sel ser fd1l+ fd1l- fd1r+ fd1r- fd2l+ fd2l- fd2r+ fd2r- vdd am 100nf 220nf 220nf 220nf 220nf 220nf 220nf 470nf 470nf 220nf 220nf 220nf 220nf 100nf 13 mpx1 mpx 100nf 100nf vb1 9 16 mpout 470nf outssr outssr d00au1158 22 12 23 amif amif 14 level level 15 mpin mpin qual gnd qual 18 sm smute 20 sda sda 21 scl scl 17 = + - outssl outssl 24 outswr outswr 25 outswl outswl 26 outrr outrr 27 outrf outlr 28 outlr outrf 29 outlf acinrr acinrf acinlr acinlf swinl swinr outlf 30 acoutr acoutr 37 36 35 10 f cref 39 220nf md1 41 220nf md1g md1 md1g 42 47nf mux 40 33 31 32 acoutl mux pause vpx control 100nf md2g mpx2 44 md2 43 acoutl 38 19 34
TDA7402 package information 69/71 11 package information in order to meet environmental requirements, st offers these devices in ecopack? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. figure 39. lqfp44 (10x10) mechanical data and package dimensions outline and mechanical data note: 1. the size of exposed pad is variable depending of lead- frame design pad size. end user should verify ?d2? and ?e2? dimensions for each device application. dim. mm inch min. typ. max. min. typ. max. a 1.60 0.0630 a1 0.05 0.15 0.0020 0.0059 a2 1.35 1.40 1.45 0.0531 0.0551 0.0571 b 0.30 0.37 0.45 0.0118 0.0146 0.0177 c 0.09 0.20 0.0035 0.0079 d 11.80 12.00 12.20 0.4646 0.4724 0.4803 d1 9.80 10.00 10.20 0.3858 0.3937 0.4016 d2 2.00 0.0787 d3 8.00 0.3150 e 11.80 12.00 12.20 0.4646 0.4724 0.4803 e1 9.80 10.00 10.20 0.3858 0.3937 0.4016 e2 2.00 0.0787 e3 8.00 0.3150 e 0.80 0.0315 l 0.45 0.60 0.75 0.0177 0.0295 l1 1.00 0.0394 k 3.5?(min.),7?(max.) ccc 0.10 0.0039 lqfp44 (10 x 10 x 1.40mm) exposed pad down 7278839 c
revision history TDA7402 70/71 12 revision history table 39. document revision history date revision changes 26-apr-02 1 initial release 21-jun-04 2 technical migration from st-press to edocs 26-apr-04 3 revalidation 26-apr-06 4 repair document of typographical errors 23-mar-07 5 package change, layout change, text modifications.
TDA7402 71/71 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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