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december 2008 rev 2 1/35 1 tda7404 car radio signal processor features 4 stereo inputs 1 mono input soft-step volume bass, treble and loudness control d i r e c t - m u t e a n d s o f t - m u t e internal beep four independent speaker outputs subwoofer stereo output digital control: ?i 2 c bus interface ? audio filter characteristics programmable description the tda7404 is a high performance signal processor specifically designed for car radio applications. the device includes a high performance audioprocessor with fully integrated audio filters. the digital control allows a programming in a wide range of all the filter characteristics. by the use of a bicmos process and a linear signal processing low distortion and low noise are obtained. so-28 table 1. device summary order code package packing tda7404d so-28 tube www.st.com
contents tda7404 2/35 contents 1 detailed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 block and pin description diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.3 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.4 esd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 description of funct ionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 autozero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2.1 autozero remain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3 mixing stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.4 loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4.3 low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.5 soft-mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.6 soft-step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7 bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.7.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.7.3 quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.7.4 dc mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.8 treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.8.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.8.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.9 external ac - coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.10 speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.11 subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
tda7404 contents 3/35 5 i2c bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.1 interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.2 transmitted data (send mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.3 reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.4 subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.5 data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
list of tables tda7404 4/35 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 3. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 5. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. others selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 7. subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 8. input selector / gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 9. loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 10. volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table 11. treble programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 12. bass programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 table 13. speaker attenuator left front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 14. speaker attenuator right front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 15. speaker attenuator left rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 16. speaker attenuator right rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 17. subwoofer attenuator (left and right) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 18. soft-mute and mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 19. others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 20. testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 21. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
tda7404 list of figures 5/35 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 2. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. input stages diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 4. signal-flow of mixing-stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 5. loudness attenuation @ fc = 400 hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 6. loudness center frequencies @ attn. = 15 db . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 7. loudness attenuation, fc = 2.4 khz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 8. soft-mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 9. soft-step timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 10. bass control @ f c = 80 hz, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 11. bass center frequencies @ gain = 15 db, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 12. bass quality factors @ gain = 14 db, f c = 80 hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 13. bass normal and dc mode @ gain = 14 db, fc = 80 hz . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 14. treble control @ fc = 17.5khz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 15. treble center frequencies @ gain = 15 db . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 16. external ac coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 17. software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 18. tda7404 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 figure 19. so-28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
detailed features tda7404 6/35 1 detailed features input multiplexer ? 1 pseudo-differential stereo input (selectable single end stereo input) ? 3 single-end stereo inputs ? 1 differential mono input ? in-gain 0..14 db, 1 db steps, 14..20 db, 2 db steps ? auto zero beep ? internal beep with 3 frequencies ? 781 hz/1.56 khz/1.8 khz mixing stage ? 4 step-mixing-stage with mono or beep as mix-signals loudness ? second order frequency response ? programmable center frequency ? 15 x 1 db steps ? selectable low and high frequency boost ? selectable flat-mode (constant attenuation) volume ? 1 db attenuator ? 100 db range ? soft-step control with programmable times bass ?2 nd order frequency response ? center frequency programmable in 4 steps ? 60 hz / 80 hz / 100 hz / 200 hz ? q programmable 1.0/1.25/1.5/2.0 ? dc gain programmable ?+ 15 db x 1 db steps tr e bl e ?2 nd order frequency response ? center frequency programmable in 4 steps ? 10 khz / 12.5 khz / 15 khz / 17.5 khz ?+ 15 db x 1 db steps speaker ? 4 independent speaker controls in 1 db steps ? control range 50 db with mute ? zero crossing attenuate subwoofer ? stereo output ? attenuator range 50 db mute functions ?direct mute ? digitally controlled soft mute with 4 programmable mute-times
tda7404 block and pin description diagrams 7/35 2 block and pin description diagrams figure 1. block diagram figure 2. pin connection (top view) sw l a coutl a coutr a cinl a cinr in p ut multi p lexer mono fader mono fader digital control i 2 c-bus beep supply out lf out rf out lr out rr sw r scl sda vref gnd vcc diffinl diffinr diffgnd se1l se1r se2l se2r se3l se3r mono+ mono - gain/auto zero loudness volume soft mute treble bass mix mixing stage mono/beep mono fader mono fader mono fader mono fader mu x zero cross mute 1 2 3 4 5 6 7 8 9 10 11 12 13 14 19 18 17 16 15 24 23 22 21 20 28 27 26 25 se1l se1r mono+ mono- acoutr acoutl acinr acinl diffinr difffgnd diffinl se2l se2r cref gnd mute swr swl outrf outrr outlr outlf vdd scl sda mux se3l se3r
electrical specifications tda7404 8/35 3 electrical specifications 3.1 supply 3.2 thermal data 3.3 absolute maximum ratings 3.4 esd all pins are protected against esd according to the mil883 standard. table 2. supply symbol parameter test condition min. typ. max. unit v s supply voltage 7.5 9 10.5 v i s supply current v s = 9v 20 ma svrr ripple rejection @ 1 khz audioprocessor (all filters flat) 60 db table 3. thermal data symbol parameter value unit r th j-pins thermal resistance junction pins max 85 c/w table 4. absolute maximum ratings symbol parameter value unit v s operating supply voltage 10.8 v t amb operating temperature range -40 to 85 c t stg storage temperature range -55 to +150 c
tda7404 electrical specifications 9/35 3.5 electrical characteristics table 5. electrical characteristics (v s =9 v; t amb =25 c; r l =10 k ; all gains = 0 db; f = 1 khz; unless otherwise specified) symbol parameter test conditions min. typ. max. unit input selector r in input resistance all single ended inputs 70 100 130 k v cl clipping level 2.20 2.60 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 18 20 22 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 5 10 mv v offset remaining offset with autozero 0.5 mv p differential stereo inputs r in input resistance (see figure 3 ) differential 70 100 130 k g cd gain only at true differential input -0.75 0 0.75 db -5 -6 -7 db -11 -12 -13 db cmrr common mode rejection ratio v cm = 1 v rms @ 1 khz 40 70 db v cm = 1 v rms @ 10 khz 40 60 db e no output noise @ speaker-outputs 20 hz - 20 khz, flat; all stages 0 db 9v differential mono input r in input resistance dif ferential 395673k cmrr common mode rejection ratio v cm = 1 v rms @ 1 khz 40 70 db v cm = 1 v rms @ 10 khz 40 60 db beep control v rms beep level 250 350 500 mv f b beep frequency f b1 740 781 820 hz f b2 1.48 1.56 1.64 khz f b3 1.7 1.8 1.9 khz
electrical specifications tda7404 10/35 mixing control m level mixing level main / mix-source 0/00 db main / mix-source -8.5/- 10.6 -3.5/- 9.6 -2.5/- 8.6 db main / mix-source -5/-5 -6/-6 -7/-7 db main / mix-source -11/- 1.5 -12/- 2.5 -13/- 3.5 db volume control g max max. gain 283032 db a max max. attenuation -83 -79 -75 db a step step resolution 0.5 1 1.5 db e a attenuation set error g = -20 to +20 db -1 0 1 db g = -80 to -20 db -4 0 3 db e t tracking error 2 db v dc dc steps adjacent steps 0.1 3 mv from 0 db to g min 0.5 5 mv loudness control a step step resolution -0.5 1 1.5 db a max max. attenuation 13 15 17 db f c center frequency 360 400 440 hz 720 800 880 hz 2.3 2.4 (1) 2.5 khz soft-mute a mute mute attenuation 80 100 db t d delay time t1 0.48 1 ms t2 0.96 2 ms t3 20 30.7 50 ms t4 70 123 170 ms v th low low threshold for sm pin (2) 1v v th high high threshold for sm pin 2.50 v r pu internal pull-up resistor 70 100 130 k v pu pull-up voltage 5 v table 5. electrical characteristics (continued) (v s =9 v; t amb =25 c; r l =10 k ; all gains = 0 db; f = 1 khz; unless otherwise specified) symbol parameter test conditions min. typ. max. unit
tda7404 electrical specifications 11/35 soft-step t sw switch time t sw1 0.68 ms t sw2 1.26 ms t sw3 2.52 ms t sw4 5.04 ms 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 72 80 88 hz f c3 90 100 110 hz f c4 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 speaker attenuator c range control range -53 50 -47 db a step step resolution only for attenuation up to 24 db 0.5 1 1.5 db a mute output mute attenuation 80 90 db e e attenuation set error -2 2 db v dc dc steps adjacent attenuation steps 0.10 5 mv t zc zero cross timer data bit d1=1, d2=1 29 37 45 ms v th zero cross threshold + 20 mv table 5. electrical characteristics (continued) (v s =9 v; t amb =25 c; r l =10 k ; all gains = 0 db; f = 1 khz; unless otherwise specified) symbol parameter test conditions min. typ. max. unit
electrical specifications tda7404 12/35 fader outputs v clip clipping level d = 0.3% 2.20 2.60 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 subwoofer attenuator c range control range -53 50 -47 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 0.10 5 mv general e no output noise bw = 20 hz - 20 khz all gains = 0 db single ended inputs 10 15 v s/n signal to noise ratio all gains = 0 db flat; v o = 2v rms 106 db bass, treble at +12 db; a-weighted; v o = 2.6 v rms 100 db d distortion v in = 1 v rms ; all stages 0 db internal pass only 0.005 0.1 % v out = 1 v rms ; bass and treble = 12 db 0.05 0.1 % s c channel separation left/right 80 100 db e t total tracking error a v = 0 to -20 db -1 0 1 db a v = -20 to -60 db -2 0 2 db 1. the sm-pin is active low (mute = 0). 2. center frequency 2.4 khz makes 1khz bottom frequency at low and high frequency boost condition. table 5. electrical characteristics (continued) (v s =9 v; t amb =25 c; r l =10 k ; all gains = 0 db; f = 1 khz; unless otherwise specified) symbol parameter test conditions min. typ. max. unit
tda7404 description of functionality 13/35 4 description of functionality 4.1 input stages most of the input stages have remained the same as in preceding st-audioprocessors with exception of the cd-inputs (see figure 3 ). in the meantime there are some cd-players in the market which have a significant high source-impedance which effects strongly the common-mode-rejection of the normal differential input stage. the additional buffer of the tda7404 diff: input avoids this drawback and offers the full common-mode-rejection even with those cd-players. figure 3. input stages diagram 1. it is possible that the differential input is switched a single ended input (se4) like se1.. 3. diffin+ / (se 4) ingain 28k 28k 28k 28k diffgnd mono+ mono - se1 se2 se3 100k 100k 100k 100k 100k
description of functionality tda7404 14/35 4.2 autozero in order to reduce the number of pins there is no ac coupling between the in-gain and the following stage, so that any offset generated by or before the in-gain-stage would be transferred or even amplified to the output. to avoid that effect a special offset-cancellation- stage called autozero is implemented. this stage is located before the mixing-block to eliminate all offsets generated by the input-stages and the in-gain (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 (input selector/gain) is selected and takes a time of max. 0.3ms . to avoid audible clicks the audioprocessor is muted before the loudness stage during this time. 4.2.1 autozero remain in some cases, for example if the p is executing a refresh cycle of the iic-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 tda7404 could be switched in the autozero-remain-mode (i2 bit of the subaddress-byte). if this bit is set to high, the databyte 0 coul d be loaded without in voking the autozero and the old adjustment-value remains. 4.3 mixing stage the 4 step mixing stage offers the possibility to mix the rear selector signal or the phone signal to any other source. due to the fact that the mixing-stage is located behind the in- gain-stage fine adjustments of the main source level could be done in this way. figure 4. signal-flow of mixing-stage diffin loudness se1 se2 se3 mono 25k beep input selector in-gain mixing mixing level input / beep or mono 0db / -100db -3.5db / - 9.6db - 6db / - 6db - 12db / - 2.5db
tda7404 description of functionality 15/35 4.4 loudness there are four parameters programmable in the loudness stage: 4.4.1 attenuation figure 5 shows the attenuation as a function of frequency at f c = 400 hz. figure 5. loudness attenuation @ f c = 400 hz 4.4.2 center frequency figure 6 shows the three possible peak-frequencies 400 hz, 800 hz and 2.4 khz. figure 6. loudness center frequencies @ attn. = 15 db -20 -15 -10 -5 0 5 10 100 1k 10k -20 -15 -10 -5 0 5 10 100 1k 10k
description of functionality tda7404 16/35 4.4.3 low and high frequency boost figure 7 shows the different loudness-shapes in low & high frequency boost. figure 7. loudness attenuation, f c = 2.4 khz 4.5 soft-mute the digitally controlled soft-mute stage allows muting/demuting the signal with a i 2 c bus programmable slope. the mute process can either be activated by the mute 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 6 ). for timing purposes the bit 0 of the i 2 c bus output register is set to 1 from the start of muting until the end of de-muting. figure 8. soft-mute timing 1. please notice that a started mute-action is always terminated and could not be interrupted by a change of the mute -signal. -20 -15 -10 -5 0 5 10 100 1k 10k
tda7404 description of functionality 17/35 4.6 soft-step 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 soft-step feature both kinds of clicks could be reduced to a minimum and are no more audible. four programmable soft step time from one step to the next, are user selectable. figure 9. soft-step timing 1. for steps more than 1 db the soft-step mode shoul d be deactivated because it c ould generate a 1 db error during the blend-time. 4.7 bass there are three parameters programmable in the bass stage: 4.7.1 attenuation figure 10 shows the attenuation as a function of frequency at a center frequency of 80hz. figure 10. bass control @ f c = 80 hz, q = 1 time ss time -1db -2db vou t 2db 1db -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k db hz
description of functionality tda7404 18/35 4.7.2 center frequency figure 11 shows the four possible center frequencies 60, 80,100 and 200 hz. figure 11. bass center frequencies @ gain = 15 db, q = 1 4.7.3 quality factors figure 12 shows the four possible quality factors 1, 1.25, 1.5 and 2. figure 12. bass quality factors @ gain = 14 db, f c = 80 hz -4 0 4 8 12 16 10 100 1k 10k 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k
tda7404 description of functionality 19/35 4.7.4 dc mode in this mode the dc-gain is increased by 4.4 db. 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 13. bass normal and dc mode @ gain = 14 db, f c = 80 hz 1. 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
description of functionality tda7404 20/35 4.8 treble there are two parameters programmable in the treble stage: 4.8.1 attenuation figure 14 shows the attenuation as a function of frequency at a center frequency of 17.5 khz. figure 14. treble control @ f c = 17.5khz 4.8.2 center frequency figure 15 shows the four possible center frequencies 10 k, 12.5 k, 15 k and 17.5 khz. figure 15. treble center frequencies @ gain = 15 db -20 -15 -10 -5 0 5 10 15 20 10 100 1k 10k -5 0 5 10 15 20 10 100 1k 10k
tda7404 description of functionality 21/35 4.9 external ac - coupling tda7404 has external ac coupling terminals which can be selected one of two positions behind the mixing stage or bass filter. figure 16. external ac coupling the external ac coupling is selected in position of four switches controlled by the lower 2bit in the others selection (see ta bl e 6 ). 4.10 speaker attenuator due to practical aspects the steps in the speaker-attenuator are not linear over the full range. at attenuations more than 24 db the steps increase from 1.5 db to 10 db (please see data byte specification). 4.11 subwoofer attenuator the subwoofer output is a single ended stereo output. the attenuator is exactly the same like the other speakers. table 6. others selection d1 d0 switch position x 0 sw3 = on, sw4 = on (selected internal pass), sw1 = b, sw2 = open 0 1 sw3 = off, sw4 = on , sw1 = a, sw2 = a 1 1 sw3 = on, sw4 = off, sw1 = b, sw2 = b b a b a sw2 sw1 sound effects vo l u m e & f i l t e r acc select or i nput speaker acout acin mixing stage sw3 sw4
i2c bus interface tda7404 22/35 5 i 2 c bus interface 5.1 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) the max. clock speed is 500 kbits/s figure 17. software specification 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 5.2 transmitted data (send mode) sm = soft mute activated x = not used the transmitted data is automatic updated after each ack. transmission can be repeated without new chipaddress. 5.3 reset condition 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. s 1 0 0 0 1 0 0 r/w ack ack ack ack p msb lsb msb lsb msb lsb chip address d99au1044 i 3 i 0 subaddress data 1 to data n i 2 i 1 a 3 a 2 a 1 a 0 msb lsb xxxxxxxsm msb lsb 1 1111 110
tda7404 i2c bus interface 23/35 with this programming all the outputs are muted to v ref (v out = v dd /2). note: all the blank bits in the following tables are "don't care"-bits. 5.4 subaddress (receive mode) table 7. subaddress (receive mode) msb lsb function i 3 i 2 i 1 i 0 a 3 a 2 a 1 a 0 0 1 zero cross / soft mute (1) zero cross available soft mute available 1. for more information see section 4.5: soft-mute . 0 1 autozero remain (2) off on 2. for more information see section 4.2: autozero 0 1 testmode (3) off on 3. for more information see test programming block 0 1 auto-increment mode (4) off on 4. if this bit is set to "1", the subaddress is automat ically increased after the tr ansmission of a data-byte. therefore a transmission of more than one byte without sending the new subaddress is possible. 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 input selector / gain loudness volume tr e b l e bass speaker attenuator lf / bass fc select speaker attenuator rf speaker attenuator lr speaker attenuator rr subwoofer attenuator lsw subwoofer attenuator rsw soft-mute / mixing others selection te s t i n g
i2c bus interface tda7404 24/35 5.5 data byte specification table 8. input selector / gain 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 mono differential single ended 1 mute single ended 2 pseudo differential / single ended 4 single ended 3 mute beep 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 x x 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 x x 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 x x 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 input gain 0 db 1 db 2 db 3 db 4 db 5 db 6 db 7 db 8 db 9 db 10 db 11 db 12 db 13 db 14 db 16 db 18 db 20 db
tda7404 i2c bus interface 25/35 note 1: the attenuation is specified at high frequenc ies. around the center frequency the value is different depending on the programmed attenuation (see section 4.4: loudness ). note 2: it is not recommended to use a gain more t han 20 db for system performance reason. in general, the max. gain should be limited by software to the maximum value, which is needed for the system. table 9. loudness msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 attenuation 0 db -1 db : -14 db -15 db 0 0 0 1 1 0 1 0 1 filter / center frequency off (flat) 'd6 must be = 0' 400 hz 800 hz 2.4 khz 0 1 shape low boost low and high boost 0 1 soft-step-volume off on table 10. volume 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 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 1 0 0 0 1 1 x 0 0 0 0 1 0 0 0 1 1 x 0 0 1 1 1 0 0 1 1 1 x 0 1 0 1 1 0 1 0 1 0 1 x gain/attenuation not allow not allow +30.0 db +29.0 db : +1.0 db 0.0 db - 1.0 db - 2.0 db : -78.0 db -79.0 db mute 0 1 diffin - mode single ended stereo differential stereo
i2c bus interface tda7404 26/35 table 11. treble programming 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 treble step s 15 db 14 db 13 db 12 db 11 db 10 db 9 db 8 db 7 db 6 db 5 db 4 db 3 db 2 db 1 db 0 db 0 1 mode cut boost x x x x 0 0 1 1 0 1 0 1 treble center frequency 10 khz 12.5 khz 15 khz 17.5 khz
tda7404 i2c bus interface 27/35 note 3: for more information please refer to section 4.7: bass . table 12. bass programming 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 bass steps 15 db 14 db 13 db 12 db 11 db 10 db 9 db 8 db 7 db 6 db 5 db 4 db 3 db 2 db 1 db 0 db 0 1 mode cut boost 0 0 1 1 0 1 0 1 quality factor 1 1.25 1.5 2 0 1 dc - mode off on
i2c bus interface tda7404 28/35 table 13. speaker attenuator left front 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 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 x 0 0 : 0 1 1 1 1 1 1 1 1 x 0 0 : 1 0 0 0 0 1 1 1 1 x 0 0 : 1 0 0 1 1 0 0 1 1 x 0 1 : 1 0 1 0 1 0 1 0 1 x attenuation 0 db -1 db : -23 db -24.5 db -26 db -28 db -30 db -32 db -35 db -40 db -50 db speaker mute 0 0 1 1 0 1 0 1 bass center-frequency 60 hz 80 hz 100 hz 200 hz table 14. speaker attenuator right front msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 xx 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 x 0 0 : 0 1 1 1 1 1 1 1 1 x 0 0 : 1 0 0 0 0 1 1 1 1 x 0 0 : 1 0 0 1 1 0 0 1 1 x 0 1 : 1 0 1 0 1 0 1 0 1 x attenuation 0 db -1 db : -23 db -24.5 db -26 db -28 db -30 db -32 db -35 db -40 db -50 db speaker mute
tda7404 i2c bus interface 29/35 table 15. speaker attenuator left rear msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 xx 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 x 0 0 : 0 1 1 1 1 1 1 1 1 x 0 0 : 1 0 0 0 0 1 1 1 1 x 0 0 : 1 0 0 1 1 0 0 1 1 x 0 1 : 1 0 1 0 1 0 1 0 1 x attenuation 0 db -1 db : -23 db -24.5 db -26 db -28 db -30 db -32 db -35 db -40 db -50 db speaker mute table 16. speaker attenuator right rear msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 xx 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 x 0 0 : 0 1 1 1 1 1 1 1 1 x 0 0 : 1 0 0 0 0 1 1 1 1 x 0 0 : 1 0 0 1 1 0 0 1 1 x 0 1 : 1 0 1 0 1 0 1 0 1 x attenuation 0 db -1 db : -23 db -24.5 db -26 db -28 db -30 db -32 db -35 db -40 db -50 db speaker mute
i2c bus interface tda7404 30/35 table 17. subwoofer attenuator (left and right) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 xx 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 x 0 0 : 0 1 1 1 1 1 1 1 1 x 0 0 : 1 0 0 0 0 1 1 1 1 x 0 0 : 1 0 0 1 1 0 0 1 1 x 0 1 : 1 0 1 0 1 0 1 0 1 x attenuation 0 db -1 db : -23 db -24.5 db -26 db -28 db -30 db -32 db -35 db -40 db -50 db speaker mute table 18. soft-mute and mixing msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 mute enable soft-mute disable soft-mute 0 0 1 1 0 1 0 1 mute/zero cross-times 0.48 ms 0.96 ms 30.7 ms / 9 ms 122.8 ms / 37 ms 0 1 mixing-source beep phone 0 0 1 1 0 1 0 1 mixing-level (main / mix-source) -12 / -2.5 db -6 / -6 db -3.5 / -9.6 db 0 / 0 0 1 1 0 1 0 1 beep frequency 781 hz 1.56 khz not allow 1.8 khz
tda7404 i2c bus interface 31/35 table 19. others msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 x 0 1 0 1 1 ac coupling internal pass coupling between mixing stage and volume coupling between bass filter and speaker attenuator 1 1 must be "1" for make up must be "1" for make up 0 0 1 1 0 1 0 1 soft step time 0.68ms 1.26ms 2.52ms 5.04ms 1 must be "1" for autozero 0 1 i nternal beep off on table 20. testing msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 x x x x x x 0 1 main-testmode off on x x x x x x 0 1 test-multiplexer internal 200khz clock internal bandgap voltage x x x x x x 0 1 clock external internal 1 1 must be "1"
application circuit tda7404 32/35 6 application circuit figure 18. tda7404 application circuit se1l se1r se2l se2r se3l se3r mono+ mono - diffinl diffingnd diffinr outlf outlr outrr outrf swl swr gnd vdd a coutl a coutr a cinl a cinr mute mux cref sda scl 100n 100n 100n 100n 100n 100n 100n 100n 100n 100n 100n 4.7u 4.7u 4.7u 4.7u 4.7u 4.7u 9v 100n 10u + sound effects tapel taper fm_l fm_r a m_l a m_ r phone phonegnd cd_l cdgnd cd_r outlf outlr outrr outrf swl swr mute sda scl aj39 spectrum analyzer 10u tda7404
tda7404 package information 33/35 7 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 19. so-28 mechanical data and package dimensions so-28 dim. mm inch min. typ. max. min. typ. max. a 2.65 0.104 a1 0.1 0.3 0.004 0.012 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.013 c 0.5 0.020 c1 45 (typ.) d 17.7 18.1 0.697 0.713 e 10 10.65 0.394 0.419 e 1.27 0.050 e3 16.51 0.65 f 7.4 7.6 0.291 0.299 l 0.4 1.27 0.016 0.050 s8 (max.) outline and mechanical data
revision history tda7404 34/35 8 revision history table 21. document revision history date revision changes 15-jul-2003 1 initial release. 16-dec-2008 document reformatted. added table 1: device summary on page 1 . updated section 7: package information .
tda7404 35/35 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. ? 2008 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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