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TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 1 (15) multistandard video-if and quasi parallel sound processing description the tda4471 is an integrated bipolar circuit for full multistandard video/sound if (vif/sif) signal processing in tv/vcr and multimedia applications. the circuit processes all tv video if signals with negative modulation (e.g., b/g standard), positive modulation (e.g., l standard) and the am, fm/nicam sound if signals. specially two video if inputs (2 vif) in combination with one sound if input (1 sif) and the common pinning with the tda4474 gives flexibility to design a universal if module for various applications. features 5 v supply voltage; low power consumption active carrier generation by fpll principle (frequency-phase-locked-loop) for true synchronous demodulation very linear video demodulation, good pulse response and excellent intermodulation figures vco circuit is operating on picture carrier frequency, the vco frequency is switchable for the l' mode alignment-free afc without external reference cir- cuit, polarity of the afc curve is switchable vif-agc for negative modulated signals (peak sync. detection) and for positive modulation (peak white/ black level detector) tuner agc with adjustable take over point alignment-free quasi parallel sound (qps) mixer for fm/nicam sound if signals intercarrier output signal is gain controlled (necessary for digital sound processing) complete alignment-free am demodulator with gain controlled af output separate sif-agc with average detection parallel operation of the am demodulator and qps mixer (for nicam-l stereo sound) two video if inputs (2 vifin) one sound if input (1 sifin) package and relevant pinning is compatible with the tda4474; simplifies the design of an universal if module package: sdip30 ordering information extended type number package remarks TDA4471-Msd sdip30
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 2 (15) ? ? ? ? ? ? ?? ?? agc (vif) tuner agc ?? ?? ? ? ?? ?? ?? agc (sif) ? ? ? ? ? ? ? ? 13 12 tuner ? ? 5 sif 1 vco + phase shift afc standard supply ?? ?? ?? l' switch vco 23 22 20 loop filter 16 offset comp. (optional) 28 fpll 0 90 vif amp 6 7 8 17 vif 1 c agc c bl take over point c agc 24 14 4,9,18 15 standard switch 25 v s ? 19 c re f intercarrier (fm / nicam) 26 fm det. am det. sif amp 27 af (am) afc video 95 9702 ?? ?? video det. control and vif input switch ?? ?? 21 afc switch ? ? ? 10 11 vif 2 ? ? ? ? ? 2 1 ?? ?? 29 30 ?? ?? 3 n.c. n.c. n.c. ?? ?? ?? ?? figure 1. block diagram
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 3 (15) pin description 1 2 3 4 5 6 7 8 10 9 29 24 23 22 20 21 19 12 11 30 27 28 25 26 v i,vif1 v i,vif1 c agc gnd v i,vif2 v i,vif2 gnd c agc r top n.c. v i,sif1 v i,sif1 v s v afc v vco v vco v sw lf v o,am v o,fm c ref r comp n.c. n.c. 18 17 14 13 95 9703 i tun v o,vid gnd c bl 16 15 v sw (stand.) v sw (l') figure 2. pinning pin symbol function 1, 2 v i,sif1 sif1 input (symmetrical) 3 n.c. not connected 4 gnd ground 5 c agc sif-agc (time constant) 6, 7 v i,vif1 vif1 input (symmetrical) 8 c agc vif-agc (time constant) 9 gnd ground 10, 11 v i,vif2 vif2 input (symmetrical) 12 r top take over point, tuner agc 13 i tun tuner agc output current 14 v o,vid video output 15 v sw standard switch 16 v sw l'-/vif input selector switch 17 c bl capacitor black level detector 18 gnd ground 19 c ref internal reference voltage 20 lf loop filter 21 v sw afc switch 22, 23 v vco vco circuit 24 v afc afc output 25 v s supply voltage 26 v o,fm intercarrier output 27 v o,am af output am sound 28 r comp offset compensation 29 n.c. not connected 30 n.c. not connected
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 4 (15) circuit description vision if amplifier the video if signal (vif) is fed through a saw filter to one of the two vif inputs (pins 67 or 1011). the selection of vif input is controlled by pin 16 in combina- tion with the standard switch. with a minimal external expense it is possible to switch between two different saw filters. both vif inputs features excellent cross-talk attenuation and an input impedance which is independent from the switching condition. the vif amplifier consists of three ac-coupled amplifier stages. each differential amplifier is gain controlled by the automatic gain control (vif-agc). output signal of the vif amplifier is applied to the fpll carrier generation and the video demodu- lator. tuner and vif-agc at pin 8 the vif-agc charges/discharges the agc capacitor to generate a control voltage for setting gain of vif amplifier and tuner in order to keep the video output signal at a constant level. therefore in case of negative modulated signals (e.g., b/g standard) the sync. level of the demodulated video signal is the criterion for a fast charge/discharge of the agc capacitor. for positive modulation (e.g., l standard) the peak white level of video signal controls the charge current. in order to reduce reaction time for positive modulation, where a very large time constant is needed, an additional black level detector (pin 17) controls the discharge current in the event of decreasing vif input signal. the agc voltage is transferred to an internal control signal, and is fed to the tuner agc to generate the tuner agc current at pin 13 (open collector output). take over point of the tuner agc can be adjusted at pin 12 by a potentiometer or an external dc voltage (from interface circuit or microprocessor). fpll, vco and afc the fpll circuit (frequency phase locked loop) consists of a frequency and phase detector to generate control voltage for the vco tuning. in the locked mode the vco is controlled by the phase detector and in unlocked mode the frequency detector is superimposed. the vco operates with an external resonance circuit (l and c parallel) and is controlled by internal varicaps. the vco control voltage is also converted to a current and represents the afc output signal at pin 24. with the afc switch (pin 21) three operating conditions of the afc are possible: afc curve arisingo or afallingo and afc aoffo. a practicable vco alignment of the external coil is the adjustment to zero afc output current at pin 24. at center frequency the afc output current is equal to zero. furthermore, at pin 16, the vco center frequency can be switched for setting to the required l' value this function is active when al modeo is selected by the standard switch. the optional potentiometer at pin 28 allows an offset compensation of the vco phase for improved sound quality (fine adjustment). without a potentiometer (open circuit at pin 28) this offset compensation is not active. the oscillator signal passes a phase shifter and supplies the in-phase signal (0 ) and the quadrature signal (90 ) of the generated picture carrier. video demodulation and amplifier the video if signal, which is applied from the gain controlled if amplifier, is multiplied with the inphase component of the vco signal. the video demodulator is designed for low distortion and large bandwidth. the demodulator output signal passes an integrated low pass filter for attenuation of the residual vision carrier and is fed to the video amplifier. the video amplifier is realized by an operational amplifier with internal feedback and 8 mhz bandwidth (3 db). a standard dependent dc level shift in this stage delivers the same sync. level for positive and negative modulation. an additional noise clipping is provided. the video signal is fed to vif-agc and to the video output buffer. this amplifier with 6db gain offers easy adaption of the sound trap. for nominal video if modulation the video output signal at pin 14 is 2 v (peak- to-peak value). sound if amplifier and sifagc the sif amplifier is nearly identical with the 3-stage vif amplifier. each differential amplifier is gain controlled by the automatic gain control for the sound if path (sif- agc). output signal of the sif amplifier is applied to the mixer for fm/nicam signals and the limiter/ demodulator for am signals. the sif-agc is related to the average level of am- or fm-carrier and controls the sif amplifier to provide a constant sif signal to the am demodulator and qps mixer. am demodulator the alignment-free am demodulator is realized by a syn- chronous detector. the modulated sif signal from the sif amplifier output is multiplied in phase with the limited sif signal (am is removed). the af signal of the demodulator output is fed to the output amplifier and to the sif-agc. for all tv standards with negative video modulation (e.g. b/g standard) the af output signal (pin 27) is switched off by the standard switch.
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 5 (15) quasi-parallel-sound (qps) mixer the qps mixer is realized by a multiplier. the sif signal (fm or nicam carrier) is converted to the intercarrier frequency by the regenerated picture carrier (quadrature signal) which is provided from the vco. the intercarrier signal is fed via an output amplifier to pin 26. standard switch to have equal polarity of the video output signal the polarity can be switched in the demodulation stage in accordance with the tv standard. additional a standard dependent dc level shift in the video amplifier delievers the same sync. level. parallel the correct vif-agc is selected for positive or negative modulated vif signals. in case of negative modulation (e.g., b/g standard) the am output signal is switched off. if the standard for positive modulation (l standard) is selected the am demodulator and qps mixer is active. this condition allows a parallel operation of the am sound signal and the nicam-l stereo sound. l' switch and vif input selection for positive modulated if signals (l/l' standard) pin 16 works as l' switch. with a control voltage at pin 16 the vco frequency can be switched for setting to the required l' value (l' standard). also a fine adjustment of the l'- vco center frequency is possible by a potentiometer. the l' switch is only active for positive modulated video if signals (standard switch in l mode). in this mode the video if input 2 (vif2) is forced by the standard switch. the possibility to select vif1 input is given by connect- ing vif2 input (pins 10 or 11) via 10 k resistor to ground. if negative modulation (b/g mode) is selected pin 16 op- erates as an input selection switch for the two vif inputs. afc switch the afc output signal at pin 24 can be controlled by a switching voltage at pin 21. it is possible to select an afc output signal with rising or falling afc curve and to switch off the afc. internal voltage stabilizer the internal bandgap reference ensures constant perfor- mance independant of supply voltage and temperature. absolute maximum ratings reference point pin 4 (9, 18), unless otherwise specified parameters symbol value unit supply voltage pin 25 v s 9.0 v supply current pin 25 i s 93 ma power dissipation, v s = + 9 v p 840 mw output currents pin 14, 26, 27 i out 5 ma external voltages pins 1, 2, 58, 1012, 14, 16, 19, 20, 2628 + 4.5 v pins 17, 22, 23 v ext + 3.5 v pins 13 + 13.5 v pins 15, 21, 24 v s v junction temperature t j +125 c storage temperature t stg 25 to +125 c electrostatic handling *) all pins v esd 300 v *) equivalent to discharging a 200 pf capacitor through a 0 resistor operating range parameters symbol value unit supply voltage range25 v s 4.5 to 9.0 v ambient temperature t amb 10 to +85 c
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 6 (15) thermal resistance parameters symbol value unit junction ambient when soldered to pcb r thja 55 k/w electrical characteristics v s = +5 v, t amb = +25 c; reference point pin 4 (9, 18), measurements are taken in test circuit according to figure 3 unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit dcsupply pin 25 supply voltage v s 4.5 5.0 9.0 v supply current i s 85 93 ma vifinputs pin 67, 1011 input sensitivity, rms value for fpll locked v in 80 120 m v rms input impedance see note 1 r in 1.2 k input capacitance see note 1 c in 2 pf vifagc pin 8, 17 if gain control range video output: 2 v pp g v 60 65 db agc capacitor at pin 8 c agc 2.2 m f black level capacitor at pin 17 c bl 100 nf tuneragc pin 12, 13, see note 2 available tuner-agc current i tun 1 2 4 ma allowable output voltage v out 0.3 13.5 v if slip tuner agc current i tun : 10% to 90% g if 8 10 db if input signal for minimum take over point r top = 10 k (v top = 4.5 v) v in 4 mv if input signal for maximum take over point r top = 0 (v top = 0.8 v) v in 40 mv variation of the take over point by temperature t amb = 55 c vifagc: g v = 46 db v in 2 3 db fpll and vco pin 20, 22, 23, 28, see note 3 max. oscillator frequency for carrier generation f vco 70 mhz vision carrier capture range f vco = 38.9 mhz c vco = 8.2 pf f cap 1.5 2 mhz oscillator drift (free runing) as function of temperature see note 4 t amb = 55 c, c vco = 8.2 pf, f vco = 38.9 mhz f/ t 0.3 %
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 7 (15) unit max. typ. min. symbol test conditions / pins parameters video output pin 14 output current source sink i out 2 5 3 ma ma output resistance see note 1 r out 100 video output signal peak-to-peak value v o,vid 1.8 2.0 2.2 v pp difference of the video signals between b/g and l v o,vid 10 % sync. level v sync 1.2 v zero carrier level for neg. modolation (ultra white level) v 8 = 3 v v dc 3.4 v zero carrier level for pos. modulation (ultra black level) v 8 = 3 v v dc 1.15 v supply voltage influence on the ultra black and ultra white level v/ v 1 %/v video bandwidth (3 db) r l 1 k , c l 50 pf b 6 8 mhz video frequency response over the agc range b 2.0 db differential gain error dg 2 5 % differential phase error dp 2 5 deg intermodulation 1.07 mhz see note 5 im 52 60 db video signal to noise ratio weighted , ccir567 s/ n 56 60 db residual vision carrier fundamental wave 38.9 mhz and second harmonic 77.8 mhz v res1 2 10 mv lower limiting level below sync level v lim1 400 mv upper limiting level above ultra white level v lim2 600 mv ripple rejection pins 25, 14 see note 1 rr 35 db standard switch pin 15 control voltage for mode 1: neg. modulated video-if signals and fm/ nicam sound see note 6 v sw1 2.0 v s v control voltage for mode 2: pos. modulated video-if signals and am/ l-nicam sound v sw2 0 0.8 v switching current i sw 100 a afc output pin 24 control slope i/ f 0.7 a/khz frequency drift by temperature related to the picture carrier frequency 0.25 0.6 % output voltage upper limit v afc v s 0.4 v lower limit 0.4 v output current i afc 0.2 ma
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 8 (15) unit max. typ. min. symbol test conditions / pins parameters afc switch pin 21 control voltage: afc aoffo afc curve rising afc curve falling see note 7 v sw 0 1.5 3.5 0.8 2.5 v s v switching current i sw 100 a l'/vif input selector switch pin 16, see note 8 control voltage: l'-vco frequency l'-vco frequency standard switch in mode 2 (l standard) v sw2 0 3.4 3.0 4.5 v control voltage: vif input 2 active vif input 1 active standard switch in mode 1 (b/g standard) v sw1 0 3.4 3.0 4.5 v switching current v sw = 0 i sw 700 a sif input pin 12 input sensitivity, rms value output signal: 3 db v in 80 120 v rms input impedance see note 1 r in 1.2 k input capacitance see note 1 c in 2 pf sif agc pin 5 if gain control range g v 60 65 db agc capacitor c agc 10 f intercarrier outpu-fm pin 26, see note 9 dc output voltage v dc 2 v output resistance see note 1 r out 150 intercarrier output voltage, rms value 5.5 mhz output voltage v in = 10 mv v out 180 250 350 mv rms weighted signal to noise ra- tio: (ccir 468) black screen: channel 1/2 grid pattern: channel 1/2 grey screen 50%: channel 1/2 ref .signal: v in =10 mv; fm dev. = 27 khz f mod = 1 khz; tested with the double fm demod. u2860b; b/g modulated if signal s/n s/n s/n 60/58 54/52 60/57 db db db ripple rejection pins 25, 26, see note 1 rr 35 db af output am pin 27, see note 10 dc output voltage v dc 2.2 v output resistance see note 1 r out 150 af output voltage, rms value m = 54 % v oaf 400 500 630 mv rms total harmonic distortion m = 54% f mod = 1khz, 12.5khz thd 1 2 % signal to noise ratio reference: m = 54%, f mod = 1 khz, 22 khz low pass filter s/n 65 db ripple rejection pin 25, 27, see note 1 rr 28 db
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 9 (15) notes: 1.) this parameter is given as an application information and not tested during production. 2.) adjustment of turn over point (delayed tuner agc) with external resistor r top or external voltage v top . 3.) resonance circuit of the vco: f = 38.9 mhz capacitor c vco = 8.2 10 pf, coil l vco with unloaded q-factor q o 60 for an oscillator voltage 100 mv rms (pin 2223); e.g. toko coil 7km, 292xns4051z 4.) the oscillator drift is related to picture carrier frequency, at external temperature-compensated lc circuit 5.) (1.07) = 20 log (4.43 mhz component/1.07 mhz component); (1.07) value related to blackwhite signal input signal conditions: picture carrier 0 db colour carrier 6 db sound carrier 24 db 6.) without external control voltage at pin 15 (open circuit) the ic automatically operates in mode 1: negative modulated video if and fm/nicam sound signals voltage at pin 15 (standard switch) 0 0.8 v 2 v vs (or pin 15 open) selected standard (mode) mode 2 (l standard) vif: pos. modulation sif: am + nicam mode 1 (b/g standard) vif: neg. modulation sif: fm/ nicam 7.) without control voltage at pin 21 (open circuit) the falling afc curve is automatically selected voltage at pin 21 (afc switch) 0 0.8 v 1.5 2.5 v 3.5 v vs (or pin 21 open) afc function afc switched aoffo afc curve arisingo afc curve afallingo 8.) without control voltage at pin 16 (open circuit) the l' switch is not active. standard switch, pin 15 mode 1: neg. modulation (b/g) 2.0 v v s mode 2: pos. modulation (l) 0 0.8 v l'/vif input switch, pin 16 3.4 v 4.5 v (or pin 16 open) 0 3.1 v 3.4 v 4.5 v (or pin 16 open) 0 3.1 v ext. voltage at vif input 2, pin 10 or 11 open 1 v open 1 v open 1 v open 1 v modulation neg. neg. neg. *) neg. neg. neg. neg. standard b/g,... b/g,... b/g,... *) l l l' l' active vif input vif1 vif1 vif2 *) vif2 vif1 vif2 vif1 *) condition not useful 9.) picture carrier pc = 38.9 mhz; sound carrier sc 1 = 33.4 mhz, sc 2 = 33.16 mhz; pc/sc 1 =13 db; pc/sc 2 = 20 db; pc unmodulated (equivalent to sync peak level) 10.) sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54 %; v in = 10 mv
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 10 (15) 29 28 27 25 24 23 22 21 20 19 18 17 16 15 2 35 46789 10 11 12 13 14 8.2 pf l vco c vco loop filter 150 470 nf afc switch afc +v s intercarrier (fm/nicam) af (am) 10 k loop comp. c ref 2.2 f black level 470 nf 10 k tuner delay tuner agc video standard switch (neg/pos) agc (vif) vif 1 agc (sif) sif 1 94 9294 30 1 26 l' and vif input switch vif 2 n.c. n.c. n.c. 10 f 2.2 f *) external l/c circuit (vco: 38.9 mhz) e.g. with toko coil 7km, 292 xns-4051z, 8 turns, 0.12 mm *) 22 k figure 3. test circuit
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 11 (15) 30 29 28 27 26 25 24 23 22 21 20 19 18 17 12 3 4 5 6789 10 11 12 13 14 8.2 pf 10 nf 22 10 nf 51 k 51 k +5 v afc intercarrier (fm/nicam) af(am) offset comp. 10 k loop filter 470 nf 150 2.2 c ref c bl 100 nf afc switch agc (sif) 10 k l vco c vco saw: fm agc (vif) saw: vif s4 standard switch +12 v 95 9839 *) 10 2.2 16 10 k video saw: vif 15 tuner from saw driver l' / vif input switch f f f f *) vco circuit: f = 38.9 mhz e.g. toko coil 7 km, 292 xns4051z, 8 turns, 0.12 mm 270 10 nf figure 4. basic application circuit
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 12 (15) internal pin configuration 1 2 2 k 2 k 20 k 3 v 95 9835 figure 5. sound if inputs (pin12) 94 8523 5 figure 6. sif-agc time constant (pin 5) 95 9831 2 k 2 k 2.3 v 4.2 v 6 7 figure 7. video if input (pin 67) 94 8525 8 figure 8. vif-agc time constant (pin 8) 900 14 k 95 9832 + 3.5 v 12 7 k 7 k figure 9. tuner agc take over point (pin 12) 13 95 9817 figure 10. tuner agc output (pin 13)
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 13 (15) 95 9818 14 2.6 ma figure 11. video output (pin 14) 15.5 k 17 k 95 9819 3.5 v 15 23 k figure 12. standard switch (pin 15) 3.5 v 5 k 500 16 3.2 v 95 9820 figure 13. l'/vif input switch (pin 16) 95 9821 17 2.7 v 5 k figure 14. black level capacitor (pin 17) 95 9822 19 3.5 v figure 15. internal reference voltage (pin 19) 95 9823 20 2.75 v figure 16. loop filter (pin 20) 10.5 k 30 k 95 9824 3.5 v 21 figure 17. afc switch (pin 21) 95 9825 7 k 7 k 22 23 figure 18. vco (pin 2223)
TDA4471-M telefunken semiconductors rev. a2, 15-oct-96 preliminary information 14 (15) 95 9826 24 figure 19. afc output (pin 24) 95 9827 1 ma 26 100 figure 20. intercarrier output (pin 26) 95 9828 27 100 1.4 ma figure 21. af-am output (pin 27) 95 9829 28 10 k 10 k 3.5 v figure 22. vco offset compensation (pin 28) dimensions in mm package: sdip30 94 9183
TDA4471-M preliminary information telefunken semiconductors rev. a2, 15-oct-96 15 (15) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423

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