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TDA7420 multifunction audio processor cassette preamplifier: forward/reverse inputs ground compatible internal switches for equalization internal adjustment for traking internal adjustment for output ams: input gain control adjustable gain versus frequency audioprocessor: inputs: 1 fully differential, 1 differ- ential, 1 stereo and 1 mono input gain from 0 to 15db (1db step) volume control from +16 to -63db (1db step) bass and treble control from -18 to 18db (1db step) direct mute, soft mute and radio mute four independent output stages: - attenuation control from 0 to -79db (1db step) - beep control (on/off, front/rear) stereo decoder: roll-off adjustment selectable deemphasis 19khz cancellation high cut control stereo blend noise blanker automatic threshold control and programmable trigger threshold integrated high pass filter package: tqfp64 (14x14) description the TDA7420 i 2 c bus controlled multifunction audio processor contains all signal processing blocks of a high performance car radio, including audioprocessor, stereodecoder, noise blanker, different mute functions, cassette preamplifier and ams function. the use of bicmos technology allows the imple- mentation of several filter functions with switched capacitor techniques like fully integrated, adjust- ment free pll loop filter, pilot detector with inte- grator. this minimizes the number of external compo- nents. due to a highly linear signal processing, using cmos-switching techniques instead of standard bipolar multipliers, very low distortion and very low noise are obtained also in the stereodecoder part. very low dc stepping is obtained by use of the bicmos technology. may 1998 ? ordering number: TDA7420 tqfp 64 (14x14) 1/29
absolute maximum ratings symbol parameter value unit v s operating supply voltage 10 v t amb operating temperature range -40 to 85 c t stg storage temperature range -55 to 150 c ac_out2_r treble_r treble_l ac_out1_r ac_in1_r ac_out1_l bass1_r bass2_r ac_in2_r ac_out2_l ac_in2_l bass2_l bass1_l v cc sda diggnd scl agnd vhcc hcr hcl vsb am_c am_r r1 l1 cd_l- cd_l+ cd_r- cd_r+ vcc_pre preout_r eqro inl2(fl) eqli eqlo eqsw vr preout_l ams_out inr2(fr) inr1(rr) inl1(rl) gnd_pre d94au182 1 2 3 5 6 4 7 8 9 10 27 11 28 29 30 31 32 59 58 57 56 54 55 53 52 51 50 49 43 42 41 39 38 40 48 47 46 44 45 22 23 24 25 26 60 61 62 63 64 17 18 19 20 21 37 36 34 33 35 12 13 14 15 16 eqri beep out_rl out_fl out_fr out_rr trigger out tblank peak vco ams_lf ams_in ams_gain intp ints ac_in1_l csm cref composit am_l pin connection thermal data symbol parameter value unit r th j-pins thermal resistance junction-pins max 85 c/w TDA7420 2/29
supply volume +16 -63 1db + mute (in, out) demodulator & amplitude adj 456khz 0 -79 1db d94au106i i 2 c bus decoder vcc multiplexer + mute cd_r- dolby b/c treble -18 +18 1db bass -18 +18 1db soft mute & radio mute lf_out rr_out rf_out scl sda fm/am 25khz 19khz cancellation rectifier peak detector + pulse former level control eqro eqlo inl1 cd_l- inl2 inr2 inr1 eqsw 3.8k (nom) 5% step 0 -6db 0.5db 0 -6db 0.5db g l r 0db 0db 0 15db 1db step am_r gain 1.5 9db 2.5db l1 r1 pll noise blanker threshold control 50 - 75 m sec deemph bus latches + ams 0 -79 1db 0 -79 1db 0 -79 1db lr_out beep vhcc vr vsb 0/-20db/ -23db/ mute l1 r1 ams out -5db 0/-20db/ -23db/ mute tblank peak 14 - november - 1995 v cc_pre dig gnd am_c am_l composit radio mute mute 20k 20k 50k 20k 20k 50k 100k 25k 25k 25k 25k 25k 25k 25k comp ams_in 100k gain 0 28db 1db ams_lf 100k gnd_pre 45 51 eqli 42 43 44 39 46 47 48 53 eqri cd_r+ 52 cd_l+ 55 54 56 57 58 59 60 61 high cut control trigger_ out 18 14 62 26 agnd cref vco 27 25 24 22 19 23 20 21 hcr hcl 17 15 16 38 9 863 7 6 5 4 10 12 13 11 cs4 ac_in2_r ac_in2_l ac_out2_l ac_out2_r tr_r tr_l bass2_r bass2_l bass1_l bass1_r 33 31 30 64 32 ints intp ams_gain ac_in1_l ac_in1_r 1 29 ac_out1r 2 ac_out1l 3 28 50 40 49 41 preout_r preout_l v cc 34 35 36 37 v s 100k w rm rm block diagram TDA7420 3/29
electrical characteristics (v s = 8.5v; t amb =25 c; r l = 10k w ; all gains = 0db; f = 1khz; unless otherwise specified, refer to the test circuit.) symbol parameter test condition min. typ. max. unit input section differential input pins 52, 53, 54, 55 r i input resistance 37 50 63 k w v cl clipping level thd = 0.3% 2.0 2.5 vrms cmrr common mode rejection ratio 45 55 db g diff differential gain -1 0 1 db stereo input pins 56, 57 r i input resistance 75 100 125 k w v cl clipping level 2.0 2.5 vrms quasi differential input pins 58, 59,60 r i input resistance 18 25 32 k w v cl clipping level 2.0 2.5 vrms composite input pin 61 r i input resistance 18 25 32 k w v cl clipping level 2.0 2.5 vrms multiplexer r o output resistance (pin 2,3) 100 200 300 w g imin minimum gain -1 0 1 db g imax maximum gain 14 15 16 db g step step resolution 0.5 1 1.5 db v dc dc steps adjacent gain step -5 1 5 mv g min to g max 2mv volume control r i input resistance (1, 64) 24 33 42 k w c max max gain 15 16 17 db a max max attenuation 63 db a stepc step resolution coarse attenuation a v = 16 to -40db 0.5 1.0 1.5 db e a attenuation set error g =16 to -40db -1.5 0 1.5 db e t tracking error 2db v dc dc steps adjacent attenuation steps -3 0.1 3 mv from 0db to a max 0.5 5 mv soft mute a mute mute attenuation 40 50 db t d delay time c ext = 22nf; i = i max 0 to -20db; i = i min 1.0 ms 23 ms bass control c range control range +15 +18 +20 db a step step resolution 0.5 1 1.5 db r b internal feedback resistance 48 65 82 k w TDA7420 4/29
electrical characteristics (continued.) symbol parameter test condition min. typ. max. unit treble control c range control range +17 +18 +19 db a step step resolution 0.5 1 1.5 db r t internal feedback resistance 37 50 63 k w speaker attenuators c range control range 79 db a step step resolution a v = 0 to -40db 0.5 1 1.5 db a mute output mute attenuation 80 100 db e a attenuation set error a v = 0 to -40db 1.50 db v dc dc step adjacent attenuation steps 0.1 3 mv audio outputs v clip clipping level d = 0.3% 2.0 2.5 v rms r l output load resistance 2 k w r out output impedance 100 200 300 w v dc dc voltage level 3.35 3.6 3.85 v general e no output noise bw = 20hz to 20khz, flat output muted all gains = 0db 4.0 5.0 15 m v m v s/n signal to noise ratio all gains 0db; v o =1v rms ; 106 db d distortion v i =1v rms ; 0.01 0.08 % s c channel separation left/right 80 95 db e t total tracking error a v = 0 to -20db; 0 1 db a v = -20 to -40db; 0 2 db bus input v il input low voltage 1v v ih input high voltage 3 v i in input current v in = 0.4v -5 5 m a v o output voltage sda acknowledge i o = 1.6ma 0.1 0.4 v supply v il supply voltage 6.5 8.5 10.0 v i s supply current stereo decoder = on 25 33 41 ma stereo decoder = off 20 28 35 ma svr ripple rejection c ref =22 m f audioprocessor 80 db stereo decoder + audioprocessor 60 db TDA7420 5/29
preamplifier (v s = 8.5v; t amb =25 c; r in = 600 w ; unless otherwise specified (see test circuit) symbol parameter test condition min. typ. max. unit r i input resistance 100 k w v out dc output voltage dc (pin 40, 50) 3.2 3.5 3.9 v r o output resistance (pins 40, 50) 100 200 300 w i i input bias current 10 m a g vo open loop gain f = 400hz 110 db g v closed loop gain nab short 31 32.5 34 db r n resistance normal position 50 250 500 w r mlr resistance metal position (left ,right) 2.85 3.8 4.75 k w r mr step resolution (versus r m )5% r mmax maximum value for r m 3.42 4.56 5.7 k w r mmin minimum value for rm 2.28 3.04 3.8 k w dolby level control control range 5.5 6.0 6.5 db step resolution 0.25 0.5 0.75 db s r slew rate nab short 1 v/ m s e n total input noise r in =600 w ; unweighted 0.8 m v r in =600 w ; ccir warn 0.5 m v r in =0 ; unweighted 0.45 m v output attenuation control d1, d0 = 00 -0.75 0 0.75 db d1, d0 = 01 -20 db d1, d0 = 10 -23 db d1, d0 = 11 -80 db thd total harmonic distortion v o = 1v; f = 1khz metal 0.02 % v o = 1v; f = 1khz normal 0.02 0.1 % v o = 1v; f = 10khz metal 0.05 % v o = 1v; f = 10khz normal 0.04 % v o = 2v; f = 1khz % svr 1 ripple rejection 75 db c s channel separation (l to r) 45 60 db c ct channel cross talk (f to r) 60 80 db s/n signal to noise v o = 388mv; metal; ccir arm 65 db audio music sensor iams out ams output current 5 ma vams out ams output low level iam out = 2ma 500 800 mv r i - 29 input resistance ams gain (pin 23) 75 100 125 k w v th1 interprogram threshold voltage 1.2 1.45 1.7 v v th2 interspace threshold voltage 4.8 5.2 5.6 v ams th ams threshold level 2.0 2.8 3.6 v v intp intp output voltage i out = 2ma 0.2 0.8 mv v ints ints output voltage i out = 2ma 0.2 0.8 mv intp charge current 50 70 150 m a ints charge current 50 70 150 m a s g gain sensitivity min gain v 30 vs v 29 11 db max gain v 30 vs v 29 42 db r i-30 ams gain resistance d6, d5 = 00 13 17.5 22 k w d6, d5 = 01 16.5 22 27.5 k w d6, d5 = 11 75 100 125 k w TDA7420 6/29
stereo decoder part electrical characteristics (v s = 8.5v; de-emphasis time: t = 50 m s; nominal mpx input volt- age on pin 61 (composite): v mpx = 0.5v rms (75khz deviation); modulation frequency = 1khz; g i = 1.5db; t amb =27 c; unless otherwise specified) symbol parameter test condition min. typ. max. unit svrr supply voltage ripple rejection v ripple = 100mv; f = 1khz 50 65 db v o dc output voltage (hcl, hcr) 3.95 4.25 4.55 v a channel separation v sb -v r = 100mv dc 50 db thd total harmonic distortion 0.02 0.3 % s + n n signal plus noise to noise ratio f = 20hz to 16khz; s=2v rms 91 db mono/ stereo switch v inth pilot threshold voltage for stereo oono p th =1 p th =0 12 19 16 26 22 34 mv rms mv rms v inth pilot threshold voltage for stereo ooffo p th =1 p th =0 8 16 14 22 20 28 mv rms mv rms stereo blend v sb-vr control voltage for channel separation a = 6db; (note 5) -300 -250 -200 mv a = 26db; -80 mv high cut control t deemp de-emphasis time constant c l ,c r = 1nf; stdds = 0 v hcc -v r = 100mv 43 50 57 m s c l ,c r = 1nf; stdds = 1 v hcc -v r = 100mv 64 75 86 m s r hcc high cut control resistance v hcc -v r = 100mv; stdds = 0 43 50 57 k w v hcc -v r = -0.5v (note 5) 115 150 185 k w vco f osc oscillator frequency 456 khz d f/f capture and hold range 0.5 1 % carrier and harmonic suppression at the output a 19 pilot signal f = 19khz 40 55 db a 38 subcarrier f = 38khz 75 db a 57 subcarrier f = 57khz 62 db a 76 subcarrier f = 76khz 90 db intermodulation (note 1) a 2f mod = 10khz; f spur = 1khz 65 db a 3f mod = 13khz; f spur = 1khz 75 db traffic radio (note 2) a 57 signal f = 57khz 70 db sca - subsidiary communications authorization (note 3) a 67 signal f = 67khz 75 db aci - adjacent channel interference (note4) a 114 signal f = 114khz 95 db a 190 signal f = 190khz 84 db TDA7420 7/29
notes to the characteristics 1 intermodulation suppression a 2 = v o ( signal )( at1khz ) v o ( spurious )( at1khz ) ;f s = (2 x 10khz) - 19khz a 3 = v o ( signal )( at1khz ) v o ( spurious )( at1khz ) ;f s = (3 x 13khz) - 38khz measured with : 91% mono signal; 9% pilot signal; fm=10khz or 13khz. 2. traffic radio (v.f.) suppression a 57 ( v.w.f. )= v o ( signal ) ( at1khz ) v o ( spurious )( at1khz 23hz ) measured with : 91% stereo signal; 9% pilot signal; fm=1khz; 5% subcarrier (f=57khz, fm = 23hz am, m = 60%) 3. sca (subsidiary communications authorization) a 67 = v o ( signal ) ( at1khz ) v o ( spurious )( at9khz ) ;f s = (2 x 38khz) - 67khz measured with : 81% mono signal; 9% pilot signal; fm=1khz; 10% sca - subcarrier (f s = 67khz, unmodulated). 4. aci (adjacent channel interference) a 114 = v o ( signal ) ( at1khz ) v o ( spurious )( at4khz ) ;f s = 110khz - (3 x 38khz) a 190 = v o ( signal ) ( at1khz ) v o ( spurious )( at4khz ) ;f s = 186khz - (5 x 38khz) - measured with 90% mono signal; 9% pilot signal; fm = 1khz; 1% spurious signal (f s = 110khz or 186khz, unmodulated). 5: control range for high cut control and stereo blend is v r - 400mv v sb ,v hcc v r -500 -400 -300 -200 -100 0 v hcc -v r 0 1 2 3 f c (khz) d94au183 figure : high cut control -400 -300 -200 -100 v sb -v r 0 10 20 30 40 sep (db) d94au184 figure : stereo blend TDA7420 8/29
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit v trmin trigger threshold (*) 1) minimum measured with nbt = 000 v peak = 1.2v d2 on byte 2 = 1 d2 on byte 2 = 0 100 150 30 200 mvp v trmin trigger threshold 1) maximum measured with nbt = 111 v peak = 1.2v d2 on byte 2 = 1 d2 on byte 2 = 0 130 185 65 250 mvp v trstep trigger threshold step size 5 mvp v trnoise noise adjusted trigger threshold 2) measured with v peak = 1.4v d2 on byte 2 = 0 nat = 00 nat = 01 nat = 10 nat = 11 140 180 240 280 mvp mvp mvp mvp v peak rectifier voltage d2 on byte 2 = 1 v mpx = 0mv 0.9 v v mpx = 50mv f = 200khz 1.5 v v mpx = 100mv f = 200khz 2.0 v v rectdev deviation dependent rectifier voltage 3) measured with v mpx = 500mv (75khz dev.) ovd = 00(off) ovd = 01 ovd = 10 ovd = 11 0.9 1.2 2.0 2.8 v v v v v rectfs field strength controlled rectifier voltage 4) measured with v mpx = 0mv v sb -v r = -500mv (fully mono.) fsc = 00(off) fsc = 01 fsc = 10 fsc = 11 0.9 1.3 1.9 2.4 v v v v t s suppression pulse duration cblank = 330pf 40 m s i os input offset current during suppression time 10 pa (*) all thresholds are measured by using a pulse with t r =2 m s, t high =2 m s and t f =10 m s. the repetition rate must not increase the peak voltage. 1) ntb represents bits d0 - d2 of nb byte 1 2) nat represents bits d3 - d4 of nb byte 1 3) ovd represents bits d5 - d6 of nb byte 1 4) fsc represents bits d0 - d1 of nb byte 2 noise blanker part features: internal 2nd order 140khz high-pass filter noise rectifier output for signal quality detection programmable trigger threshold trigger threshold dependent on high frequency noise with pro- grammable gain additional circuits for deviation and field strength -dependent trig- ger adjustment blanking time programmable by ex- ternal capacitor very low offset current during hold time due to opamps with mos inputs v th v mpx dc-level t r t high t f time d94au185 TDA7420 9/29
description description of the noiseblanker in the normal automotive environment the mpx signal is disturbed by ignition spikes, motors and high frequency switches etc. the aim of the noiseblanker part is to cancel the influence of the spikes produced by these compo- nents. therefore the output of the stereodecoder is switched off for a time of 40 m s (average spike du- ration). in a first stage the spikes must be detected but to avoid a wrong triggering on high frequency noise a complex trigger control is implemented. behind the triggerstage a pulse former generates the 40 m s oblankingo pulse. in the following section all of these circuits are de- scribed in their function and their programming, too (see fig.1). 1.1 normal trigger path (rect-peak, act, peak-comp, blank-comp, bias-mono) the incoming mpx signal is highpass-filtered, amplified and rectified (block rect-peak). the second order highpass-filter has a corner-fre- quency of 140khz. the gain of the rectifier can be controlled by the bit d2 of the noiseblanker byte2. if programming bit d2 to zero the gain is only half of the nominal value. all trigger thresholds must be roughly doubled in this case. the rectified signal, rect, is used to generate by peak-rectification a signal called peak, which is available at the peak pin. also noise with a frequency >100khz increases the peak voltage. the value of the peak voltage influences the trigger threshold voltage vth (block atc). both signals, rect and peak+vth are fed to a comparator (block peak-comp) which outputs a sawtooth-sharped waveform at the tblank pin, it is triggered. a second comparator (block blank-comp) forms the internal blanking duration of 40 m s. the noiseblanker is supplied by his own biasing circuit (block bias-mono). 1.2 automatic threshold control (atc) there are two independent possibilities for pro- gramming the trigger threshold: a)the minimum threshold in 8 steps (bits d0-d2, nb-byte 1) b)the maximum threshold in 4 steps (bits d3- d4, nb-byte 1) (see fig.2) the low threshold is used in combination with a good mpx signal without any noise. the sensitivity in this operation is high, depending only on the programmed olow trigger thresholdo, bits d0-d2 of the noiseblanker byte 1. it is independent of the peak voltage. the mpx signal is noisy (low fieldstrength) the peak signal increases due to the higher noise, which is also rectified (see part 1.1). with increasing of the peak voltage the trigger threshold voltage increases, too. this particular gain is programmable in 4 steps (see fig.2). 1.3 automatic threshold control by the stereoblend voltage (atc-sb) besides the noise controlled threshold adjustment there is an additional possibility for influencing the trigger. it is controlled by the difference between vsb and vr, similar to the stereoblend. the reason for implementing such a second con- trol will be explained in the following: 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 (fig.3). but in some cases the behaviour of the noise- blanker can be improved by increasing the threshold even in a region of higher fieldstrength, for the mpx signal often shows distortion in this range. because of the overlap of this range and the range of the stereo/mono transition it can be con- trolled by vsb and vr. this threshold increase is programmable in 3 steps or switched off (see fig.3). 1.4 over deviation detector (mpx-rect) sometimes when listening to stations with a higher deviation than 75khz the noiseblanker triggers on the high frequency modulation. to avoid this blanking, which causes noise in the output signal, the noiseblanker offers a deviation- dependent threshold adjustment. by rectifying the mpx signal a further signal rep- resenting the actual deviation is obtained. it is used to increase the peak voltage. offset and gain of this circuit are programmable in 3 steps (the first step turns off the detector, see fig.4). TDA7420 10/29
80khz lp signal path atc automatic threshold control peak+vth rect-peak buf peak amp rect - + peak comp ref. blank comp 1 4 5 i 2 c-bus additional threshold control (atc-sb, mpx_rect) 40 m s left right to input selector of audioproc. cmos output stage mpx in v r v sb c peak 47nf r peak 82k w c blank 330pf trigger out 40 m s d94au189a figure 1: block diagram of the noise blanker 65mv 30mv 8 steps noise adjusted trig. threshold trig. threshold 280mv 240mv 180mv 140mv 0.9v vth 1.4v v peak(v) d94au186b figure 2: trigger threshold vs. v peak TDA7420 11/29
sub address lsb msb lsb msb lsb msb v peak (v) d94au188 20 deviation(khz) 0.9 1.2 2.0 2.8 detector off (00) 32.5 45 75 ovm =01 ovm =10 ovm =11 figure 4: behaviour of the deviation dependent threshold adjust (over deviation detector) i 2 c bus interface 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) s1000100r/wackxxt ia 3 a 2 a 1 a 0 ack data ack p ack = acknowledge s = start p = stop i = autoincrement max clock speed 500kbits/s autoincrement if bit i in the subaddress byte is set to o1o, the autoincrement of subaddress is enabled. chip address data 1...data n 2.4v(11) trig. threshold 0.9v v peak e' d94au187b 1.9v(10) 1.3v(01) mono stereo noisy signal good signal atc_sb off (00) noise 3g figure 3: behaviour of the field strength controlled threshold adjustment TDA7420 12/29
msb lsb function xxx id 3 d 2 d 1 d 0 0000mux 0001 volume 0010 treble 0011 bass 0100 speaker attenuator lf 0101 speaker attenuator rf 0110 speaker attenuator lr 0111 speaker attenuator rr 1000 mute & beep 1001 stereodecoder 1010 noise blanker 1 1011 noise blanker 2 1100ams 1101 dolby level control 1110 metal resistance control 1111 preamplifier attenuation if bit in the subaddress byte is set to o 1o, the autoincrement of subaddress is enabled subaddress (receive mode) transmitted data (send mode) msb lsb x x x x x st sm ams high = active ams = true blank detected sm = soft mute activated st = stereo (high = active) TDA7420 13/29
msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 input gain 00000db 00011db 00102db 00113db 01004db 01015db 01106db 01117db 10008db 10019db 1010 10db 1011 11db 1100 12db 1101 13db 1110 14db 1111 15db 0 0 0 full diff cd 0 0 1 stereo 0 1 0 stereo decoder 0 1 1 am quasi diff input 1 0 0 quasi diff cd 1 0 1 not allowed 1 1 0 not allowed 1 1 1 am mono (am r input) input selector TDA7420 14/29
volume msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 -1 db steps 0 0 0 -0db 0 0 1 -1db 0 1 0 -2db 0 1 1 -3db 1 0 0 -4db 1 0 1 -5db 1 1 0 -6db 1 1 1 -7db -8 db steps 0000 16db 0001 8db 010 0db 0 1 1 -8db 1 0 0 -16db 1 0 1 -24db 1 1 0 -32db 1 1 1 -40db 1000 -48db 1001 -56db 1 mute TDA7420 15/29
treble msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 110010 -18db 110001 -17db 110000 -16db 101111 -15db 101110 -14db 101101 -13db 101100 -12db 101011 -11db 101010 -10db 101001 -9db 101000 -8db 100111 -7db 100110 -6db 100101 -5db 100100 -4db 100011 -3db 100010 -2db 100001 -1db 1000000db 0000000db 0000011db 0000102db 0000113db 0001004db 0001015db 0001106db 0001117db 0010008db 0010019db 001010 10db 001011 11db 001100 12db 001101 13db 001110 14db 001111 15db 010000 16db 010001 17db 010010 18db TDA7420 16/29
bass msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 110010 -18db 110001 -17db 110000 -16db 101111 -15db 101110 -14db 101101 -13db 101100 -12db 101011 -11db 101010 -10db 101001 -9db 101000 -8db 100111 -7db 100110 -6db 100101 -5db 100100 -4db 100011 -3db 100010 -2db 100001 -1db 1000000db 0000000db 0000011db 0000102db 0000113db 0001004db 0001015db 0001106db 0001117db 0010008db 0010019db 001010 10db 001011 11db 001100 12db 001101 13db 001110 14db 001111 15db 010000 16db 010001 17db 010010 18db 1 non dc extended bass 0 dc extended bass TDA7420 17/29
mute & beep msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 1 soft mute - fast slope 0 soft mute - slow slope 1 soft mute off 0 soft mute on 0 0 direct input mute on 1 0 direct input mute off 0 0 radio mute on 1 0 radio mute off 1 composit input enabled 0 composit mute enabled 1 beep on - front 1 beep on - rear 1 vco off 0 vco on speakers attenuators msb lsb lf, lr, rf, rr d7 d6 d5 d4 d3 d2 d1 d0 -1db steps 0000db 0 0 1 -1db 0 1 0 -2db 0 1 1 -3db 100-4b 1 0 1 -5db 1 1 0 -6db 1 1 1 -7db 8db steps 0000 0db 0001 -8db 0010 -16db 0011 -24db 0100 -32db 0101 -40db 0110 -48db 0111 -56db 1000 -64db 1001 -72db 110 mute 101 111 TDA7420 18/29
noise blanker 1 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 noise blanker threshold vpeak = 0.9v 000v th = 30mv 001v th = 35mv 010v th = 40mv 011v th = 45mv 100v th = 50mv 101v th = 55mv 110v th = 60mv 111v th = 65mv noise blanker noise adjusted threshold vpeak = 1.4v 00 v th = 140mv 01 v th = 180mv 10 v th = 240mv 11 v th = 280mv gain of overdeviation detector vpeak with mpx of 75khz deviation 0 0 detector off 0 1 vpeak = 1.2vop 1 0 vpeak = 2.0vop 1 1 vpeak = 2.8vop stereo decoder msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 input gain 0 0 1.5db input gain 0 1 4.0db input gain 1 0 6.5db input gain 1 1 9db input gain roll off adjustement 0 0 1 20.2% 0 1 0 21.9% 0 1 1 23.7% 1 0 0 25.5% 1 0 1 27.3% 1 1 0 29.2% 111 31% 0 deemph. time constant 75 m s 1 deemph. time constant 50 m s 1 forced mono 0 stereo enabled 0 pilot threshold high 1 pilot threshold low TDA7420 19/29
noise blanker 2 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 field strenght controlled rectifier voltage (control by vsb-vr) vpeak at vsb-vr = -500mv (fully mono) 0 0 control off 0 1 vpeak = 1.3v 1 0 vpeak = 1.9v 1 1 vpeak = 2.4v noise blanker gain 1 low 0 high msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 att. sensitivity tuning 0 0 0db 0 1 -1db 1 0 -2db 1 1 -3db gain sensitivity tuning 000 0db 0 0 1 10db 0 1 0 14db 0 1 1 18db 1 0 0 22db 1 0 1 26db 1 1 0 30db 1 1 1 34db ac sensitivity tuning 0 0 22db f = 1.1khz sw1 = sw2 = sw3 0 1 34db f = 1.1khz 1 0 not allowed 1 1 21db f = 160hz 0amson 1 ams off ams TDA7420 20/29
dolby level control msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 right channel 00000db 0001 -0.5db 0010 -1.0db 0011 -1.5db 0100 -2.0db 0101 -2.5db 0110 -3.0db 0111 -3.5db 1000 -4.0db 1001 -4.5db 1010 -5.0db 1011 -5.5db 1 1 x x -6.0db left channel 0000 -0db 0001 -0.5db 0010 -1.0db 0011 -1.5db 0100 -2.0db 0101 -2.5db 0110 -3.0db 0111 -3.5db 1000 -4.0db 1001 -4.5db 1010 -5.0db 1011 -5.5db 1 1 x x -6.0db TDA7420 21/29
metal resistance control msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 right channel 1000r metal +20% 0000r metal +15% 0001r metal +10% 0010r metal +5% 0011r metal =3.8k w typical 0100r metal - 5% 0101r metal - 10% 0110r metal - 15% 0111r metal - 20% left channel 1000 r metal +20% 0000 r metal +15% 0001 r metal +10% 0010 r metal +5% 0011 r metal =3.8k w typical 0100 r metal - 5% 0101 r metal - 10% 0110 r metal - 15% 0111 r metal - 20% preamplifier msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 attenuation control 0 0 0db 0 1 -20db 1 0 -23db 1 1 mute 0 reverse mode on 1 forward mode on TDA7420 22/29
20 m a v cc 33k vcc/2 d95au267 gnd pins: 1, 64 50k v cc d95au268 20 m a v cc/2 v cc gnd gnd pins: 2, 3,6, 7, 20 m a v cc 33k vcc/2 d95au270 gnd pins: 8, 9 v cc d95au269 20 m a v cc gnd gnd 205 pins: 40, 50 65k v s bass-rb d95au272 20 m a bass-lb pins: 11, 13 65k v cc pin 13 d95au271a 20 m a pin 11 gnd gnd pins: 10, 12 TDA7420 23/29
d95au273 20 m a gnd gnd pin: 15 d95au274 20 m a gnd pin: 16 v cc d95au276 gnd v cc gnd 25k 75k pins: 20, 21 40 m a v cc 4k d95au275 gnd 205 20 m a v cc gnd gnd gnd pin: 19 v cc gnd 205 20 m a gnd d95au278 pin: 23 40 m a v cc d95au277 gnd 205 20 m a gnd gnd 40 m a v cc 16k pin: 22 TDA7420 24/29
v cc gnd 205 gnd d95au279 v cc pin: 24 v cc gnd 205 d95au280 35 m a gnd 40 m a pin: 25 v cc gnd d95au282 100 m a v cc 56k 6k 4k 50 m a2k gnd pin: 27 v cc gnd 280 d95au281 40 m a v cc v cc v cc 500 500 pin: 26 20 m a v cc 100k v cc /2 d95au284 gnd pins: 29, 56, 57 v cc gnd d95au283 20 m a gnd v cc 12k 20 m a gnd v cc 12k pin: 28 TDA7420 25/29
100k v cc d95au285 10k v cc gnd gnd pin: 30 v cc d95au286 gnd gnd gnd pin: 31 v cc d95au288 gnd v cc gnd 29k gnd pin: 33 v cc gnd gnd gnd gnd d95au287 pin: 32 20 m a v cc 50k v cc /2 d95au290 gnd 50k pins: 38 v cc d95au289 20 m a gnd gnd 205 24 gnd pins: 34, 35, 36, 37 TDA7420 26/29
v cc d95au291 gnd gnd 205 v cc pins: 39 v cc d95au292 gnd 4.56k 224k v cc gnd pins: 41,49 v cc d95au294 pin 43, 44 gnd pin 46, 47 pins: 43, 44, 46, 47 v cc d95au293 20 m a gnd gnd 205 pins: 42, 48 v cc d95au296 gnd 20k 50k v cc/2 20k pin 55 pin 54 pins: 54, 55 v cc d95au295 gnd 20k 50k v cc/2 20k 20 m a pin 53 pin 52 pins: 52, 53 TDA7420 27/29
25k v cc d95au297 25k v cc gnd gnd 20 m a pins: 58, 60 v cc d95au298 gnd 25k v cc/2 25k 20 m a 20 m a pin: 59 20k 20k gnd v cc d95au300 gnd v cc pin: 62 v cc d95au299 gnd 25k v cc/2 20 m a pin: 61 1.7k v cc d95au301 10k gnd gnd 20 m a gnd gnd pin: 63 TDA7420 28/29
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a trademark of stmicroelectronics ? 1998 stmicroelectronics printed in italy all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. TDA7420 29/29

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