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february 2009 rev 6 1/40 1 tda7419 3 band car audio processor features 4 stereo inputs soft-step volume bass, middle, treble and loudness direct mute and soft-mute four independent speaker outputs sub woofer output soft-step speaker/su bwoofer control 7 bands spectrum analyzer digital control: ?i 2 c bus interface description the tda7419 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 programming in a wide range of filter characteristics. by the use of bicmos-process and linear signal processing low distortion and low noise are obtained. so-28 table 1. device summary order code package packing tda7419 so-28 tube tda7419tr so-28 tape and reel www.st.com
contents tda7419 2/40 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 description of t he audio processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 audio processor features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2 input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.1 quasi-differential stereo input (qd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2.2 single-ended stereo input (se1, se2, se3/ac2in) . . . . . . . . . . . . . . . . 15 4.3 autozero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.3.1 autozero remain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.4 loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.4.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.4.2 peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.4.3 low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.4.4 flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.5 soft-mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.5.1 soft-step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.6 bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.6.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.6.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.6.3 quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.6.4 dc mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.7 middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.7.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.7.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.7.3 quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
tda7419 contents 3/40 4.8 treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.8.1 attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.8.2 center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.9 subwoofer filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.10 spectrum analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.11 ac coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.12 hpf applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.13 output selector and mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.14 audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.15 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5i 2 c bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1 interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.1 receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.2 transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.1.3 reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.2 subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5.3 data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
list of tables tda7419 4/40 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 3. supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 5. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 7. subaddress (receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 8. main selector (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 9. main loudness (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 table 10. soft-mute / clock generator (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 11. volume / speaker / mixing / subwoofer attenuation (3, 10-15) . . . . . . . . . . . . . . . . . . . . . . 32 table 12. treble filter (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 table 13. middle filter (5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 table 14. bass filter (6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 15. second source selector (7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 table 16. subwoofer /middle / bass (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 table 17. mixing / gain effect (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 table 18. spectrum analyzer / clock source / ac mode (16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 table 19. testing audio processor (17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 table 20. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
tda7419 list of figures 5/40 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 4. loudness attenuation @ fp = 400 hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 5. loudness center frequencies @ attn. = 15 db . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 6. loudness attenuation, fc = 2.4 khz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 7. soft-mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 8. soft-step timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 9. bass control @ fc = 80 hz, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 10. bass center frequencies @ gain = 15 db, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 11. bass quality factors @ gain = 14 db, fc = 80 hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 12. bass normal and dc mode @ gain = 14 db, fc = 80 hz . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 13. middle control @ fc = 1 khz, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 14. middle center frequencies @ gain = 14 db, q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 15. middle quality factors @ gain = 14 db, fc = 1 khz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 16. treble control @ fc = 17.5 khz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 17. treble center frequencies @ gain = 15 db . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 18. subwoofer control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 figure 19. spectrum analyzer block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 figure 20. timing of the spectrum analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 figure 21. diagram of ac coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 figure 22. hpf diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 figure 23. output selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 figure 24. test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 25. so-28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
block diagram tda7419 6/40 1 block diagram figure 1. block diagram outlf outrf outlr outrr input multiplexer ingain autozero i 2 c bus digital control outsw/ outlr2 mute loudness middle treble bass softmute softstep volume softstep monofader softstep monofader softstep monofader supply vdd cref gnd sda scl diffg diffl se1r se1l diffr se2l se2r spectrum analyzer softstep monofader subwoofer lpf mix mix mix/ outsw/ outrr2 hpf hpf softstep monofader softstep monofader ac2inl/ se3l ac2inr/ se3r acoutl/ ac2outl acoutr/ ac2outr acinl/ filol acinr/ filor vrefoutf saout saclk ingain outlf outrf outlr outrr input multiplexer ingain autozero i 2 c bus digital control i 2 c bus digital control outsw/ outlr2 mute loudness middle treble bass softmute softstep volume softstep monofader softstep monofader softstep monofader supply vdd cref gnd sda scl diffg diffl se1r se1l diffr se2l se2r spectrum analyzer softstep monofader subwoofer lpf mix mix mix/ outsw/ outrr2 hpf hpf softstep monofader softstep monofader ac2inl/ se3l ac2inr/ se3r acoutl/ ac2outl acoutr/ ac2outr acinl/ filol acinr/ filor vrefoutf saout saclk ingain
tda7419 pin description 7/40 2 pin description figure 2. pin connection (top view) table 2. pin description pin n# pin name function i/o 1 acoutr / ac2outr ac coupling right output / hpf filter ac2out right channel o 2 acinr / filor ac coupling right input / hpf filter filo right channel i/o 3 acinl / filol ac coupling left input / hpf filter filo left channel i/o 4 acoutl / ac2outl ac coupling left output / hpf filter ac2out left channel o 5 se3l / acinl single-ended input 3 left channel / ac coupling left input i 6 se3r / acinr single-ended input 3 right channel / ac coupling right input i 7 se2l single-ended input 2 left channel i 8 se2r single-ended input 2 right channel i 9 se1l single-ended input 1 left channel i 10 se1r single-ended input 1 right channel i 11 diffl pseudo differential stereo input left i 12 diffg pseudo differential stereo input common i 13 diffr pseudo differential stereo input right i 14 cref reference capacitor o 15 gnd ground s 16 outsw / outlr2 subwoofer output / 2 nd rear left output o 17 outrf front right output o acoutr/ac2outr acinr/filor acinl/filol acoutl/ac2outl se3l/acinl se2l se3r/acinr se2r se1l outlf mute scl vdd sda sain saout vref mix/outsw/outrr2 1 3 2 4 5 6 7 8 9 26 25 24 23 22 20 21 19 27 10 28 se1r outlr d04au1569 diffl diffg diffr outsw/outlr2 outrf outrr 11 12 13 18 16 17 15 14 cref gnd
pin description tda7419 8/40 18 outrr rear right output o 19 outlr rear left output o 20 outlf front left output o 21 mute external mute pin i 22 scl i2c bus clock i 23 sda i2c bus data i/o 24 vdd supply s 25 sain spectrum analyzer clock input i 26 saout spectrum analyzer output o 27 vref vref output o 28 mix / outsw / outrr2 mix input / additional subwoofer output / 2 nd rear right output i/o table 2. pin description (continued) pin n# pin name function i/o
tda7419 electrical specifications 9/40 3 electrical specifications 3.1 supply 3.2 thermal data 3.3 absolute maximum ratings table 3. supply symbol parameter test condition min. typ. max. unit v s supply voltage 8.0 8.5 10 v i s supply current v s = 8.5 v 30 35 40 ma svrr ripple rejection @ 1 khz audioprocessor (all filters flat) 60 db table 4. thermal data symbol parameter value unit r th j-pins thermal resistance junction to pinsmax 85 c/w table 5. 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 withstand voltage human body model 1750 v machine model 150 charged device model 1500
electrical specifications tda7419 10/40 3.4 electrical characteristics table 6. electrical characteristics v s = 8.5v; t amb = 25c; r l = 10k ; all gains = 0 db; f = 1 khz; unless otherwise specified symbol parameter test condition min. typ. max. unit supply v s supply voltage 8 8.5 10 v i s supply current 27 37 47 ma input selector r in input resistance all single ended inputs 70 100 130 k v cl clipping level all input 1.8 2 v rms qd input 1.7 2 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 -20 4 20 mv v offset remaining offset with autozero 0.5 mv differential stereo inputs r in input resistance dif ferential 70 100 130 k cmrr common mode rejection ratio v cm =1 vrms @ 1 khz 46 70 db v cm =1 vrms @ 10 khz 46 60 db e no output noise @ speaker outputs 20 hz to 20 khz, flat; all stages 0 db 12 v mixing control m level mixing ratio main / mix source -6/-6 db g max max gain 13 15 17 db a max max attenuation -83 -79 -75 db a step step resolution 0.5 1 1.5 db loudness control a max max attenuation -17 -15 -13 db a step step resolution 0.5 1 1.5 db f peak peak frequency f p1 360 400 440 hz f p2 720 800 880 hz f p3 2200 2400 2600 hz
tda7419 electrical specifications 11/40 volume control g max max gain 13 15 17 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 -0.75 0 +0.75 db g = -79 to -20 db -4 0 3 db e t tracking error 2db v dc dc steps adjacent attenuation steps -3 0.1 3 mv from 0db to g min -5 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 v th low low threshold for sm pin 1 v 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 fc 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 c range control range 14 15 16 db a step step resolution 0.5 1 1.5 db dc gain bass-dc-gain dc = off -1 0 +1 db dc = on (shelving filter, use for cut only) -4.4 db table 6. electrical characteristics (continued) v s = 8.5v; t amb = 25c; r l = 10k ; all gains = 0 db; f = 1 khz; unless otherwise specified symbol parameter test condition min. typ. max. unit
electrical specifications tda7419 12/40 middle 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 400 500 600 hz f c2 0.811.2khz f c3 1.2 1.5 1.8 khz f c4 22.53khz q bass quality factor q 1 0.45 0.5 0.55 q 2 0.65 0.75 0.85 q 3 0.911.1 q 4 1.11.251.4 treble control c range clipping level 14 15 16 db a step step resolution 0.5 1 1.5 db fc 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 attenuators g max max gain 14 15 16 db a max max attenuation -83 -79 -75 db a step step resolution 0.5 1 1.5 db a mute mute attenuation 80 90 db e e attenuation set error 2 db v dc dc steps adjacent attenuation steps -5 0.1 5 mv audio outputs v cl clipping level d = 0.3% 1.8 2 v rms r out output impedance 30 100 w r l output load resistance 2 k c l output load capacitor 10 nf v dc dc voltage level 3.8 4.0 4.2 v subwoofer attenuator g max max gain 14 15 16 db a max max attenuation -83 -79 -75 db table 6. electrical characteristics (continued) v s = 8.5v; t amb = 25c; r l = 10k ; all gains = 0 db; f = 1 khz; unless otherwise specified symbol parameter test condition min. typ. max. unit
tda7419 electrical specifications 13/40 a step step resolution 0.5 1 1.5 db a mute mute attenuation 80 90 db e e attenuation set error 2 db v dc dc steps adjacent attenuation steps -5 1 5 mv 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 hpf effect g max max gain 21 22 23 db g min min gain 3 4 5 db a step step resolution 1.5 2 2.5 db spectrum analyzer control v saout output voltage range 0 3.3 v f c1 center frequency band 1 5.5 62 69 hz f c2 center frequency band 2 141 157 173 hz f c3 center frequency band 3 356 392 436 hz f c4 center frequency band 4 0.9 1 1.1 khz f c5 center frequency band 5 2.26 2.51 2.76 khz f c6 center frequency band 6 5.70 6.34 6.98 khz f c7 center frequency band 7 14.4 16 17.6 khz q quality factor q1 1.62 1.8 1.98 q2 3.15 3.5 3.85 f saclk clock frequency 3 100 khz t sadel analog output delay time 2 s t repeat spectrum analyzer repeat time 50 ms t intres internal reset time 4.5 ms general e no output noise bw = 20 hz to 20 khz all gain = 0db 12 20 v bw = 20 hz to 20 khz output muted 615 v s/n signal to noise ratio all gain = 0 db flat; v o = 2 v rms 100 db d distortion v in = 1 v rms ; all stages 0 db 0.01 0.1 % s c channel separation left/right 80 90 db table 6. electrical characteristics (continued) v s = 8.5v; t amb = 25c; r l = 10k ; all gains = 0 db; f = 1 khz; unless otherwise specified symbol parameter test condition min. typ. max. unit
description of the audio processor tda7419 14/40 4 description of the audio processor 4.1 audio processor features input multiplexer ? qd / se: quasi-differential stereo inputs, with selectable single-ended mode ? se1: stereo single-ended input ? se2: stereo single-ended input ? se3 / ac2in: stereo single-ended input / hpf filter input ? in-gain 0 to 15db, 1db steps ? internal offset-cancellation (autozero) ? separate second source-selector mixing stage ? mixable to front speaker-outputs loudness ?2 nd order frequency response ? programmable center frequency (400hz/800hz/2400hz) ? 15 db with 1 db steps ? selectable low and high frequency boost ? selectable flat-mode (constant attenuation) volume ? +15 db to -79 db with 1 db step resolution ? soft-step control with programmable blend 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 to 15 db range with 1 db resolution middle ?2 nd order frequency response ? center frequency programmable in 4 steps (500hz/1khz/1.5khz/2.5khz) ? q programmable 0.5/0.75/1.0/1.25 ? dc gain programmable ? -15 to 15db range with 1db resolution tr e bl e ?2 nd order frequency response ? center frequency programmable in 4 steps (10khz/12.5khz/15khz/17.5khz) ? -15 to 15db range with 1db resolution spectrum analyzer ? seven bandpass filters ?2 nd order frequency response
tda7419 description of the audio processor 15/40 ? programmable q factor for different visual appearance ? analog output ? controlled by external serial clock speaker ? 4 independent soft-step speaker controls, +15db to -79db with 1db steps ? independent programmable mix input with 50% mixing ratio for front speakers ?direct mute subwoofer ? 2nd order low pass filter with programmable cut off frequency ? single-ended mono output independent soft-step level control, +15db to -79db with 1db steps mute functions ?direct mute ? digitally controlled soft-mute with 3 programmable mute- times(0.48ms/0.96ms/123ms) effect ? gain effect, or high pass effect with fixed external components 4.2 input stages in the basic configuration, one stereo quasi-differential and three (two in case of hps applications) single ended stereo inputs are available. 4.2.1 quasi-differential stereo input (qd) the qd input is implemented as a buffered quasi-differential stereo stage with 100 k input- impedance at each input. the attenuation is fixed to -3 db in order to adapt the incoming signal level. 4.2.2 single-ended stereo i nput (se1, se2, se3/ac2in) the input impedance at each input is 100 k and the attenuation is fixed to -3db for incoming signals. the input for se3 is also conf igurable as part of the interface for external filters in hps applications (ac2in)
description of the audio processor tda7419 16/40 figure 3. input stage 4.3 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 input source is changed and needs max. 0.3ms for the alignment. to avoid audible clicks the audio processor is muted before the loudness stage during this time. the autozero feature is only present in the main signal-path. 4.3.1 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, it can be switched in the autozero remain mode (bit 6 of the subaddress byte). if this bit is set to high, the autozero will not be invoked and the old ad justment-value remains. 4.4 loudness there are four parameters programmable in the loudness stage: 4.4.1 attenuation figure 4 shows the attenuation as a function of frequency at f p = 400 hz output stage qd qd_l qd_r qd_g se3 se2 se2_l se2_r qd se1 se2 se3 main source second source in gain se1 se1_l se1_r ac2in_l/se3l ac2in_r/se3r se4
tda7419 description of the audio processor 17/40 figure 4. loudness attenuation @ f p = 400 hz. 4.4.2 peak frequency figure 5 shows the three possible peak frequencies 400 hz, 800 hz and 2.4 khz. figure 5. 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 the audio processor tda7419 18/40 4.4.3 low and high frequency boost figure 6 shows the different loudness shapes in low and high frequency boost. figure 6. loudness attenuation, f c = 2.4 khz 4.4.4 flat mode in flat mode the loudness stage works as a 0 db to -15 db attenuator. 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 soft-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 7 ). 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 demuting. -20 -15 -10 -5 0 5 10 100 1k 10k
tda7419 description of the audio processor 19/40 figure 7. 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 4.5.1 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 featur e 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. soft-step timing 1. for steps more than 0.5db the soft-step 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: 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
description of the audio processor tda7419 20/40 4.6.1 attenuation figure 9 shows the attenuation as a function of frequency at a center frequency of 80 hz. figure 9. bass control @ f c = 80 hz, 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
tda7419 description of the audio processor 21/40 4.6.2 center frequency figure 10 shows the four possible center frequencies 60, 80, 100 and 200 hz. figure 10. bass center frequencies @ gain = 15 db, q = 1 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 = 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
description of the audio processor tda7419 22/40 4.6.4 dc mode it is used for cut only for shelving filter. 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 12. 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. 4.7 middle there are three parameters programmable in the middle stage: 4.7.1 attenuation figure 13 shows the attenuation as a function of frequency at a center frequency of 1 khz. figure 13. middle control @ f c = 1 khz, q = 1 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k
tda7419 description of the audio processor 23/40 4.7.2 center frequency figure 14 shows the four possible center frequencies 500 hz, 1 khz, 1.5 khz and 2.5 khz. figure 14. middle center frequencies @ gain = 14 db, q = 1 4.7.3 quality factors figure 15 shows the four possible quality factors 0.5, 0.75, 1 and 1.25. figure 15. middle quality factors @ gain = 14 db, fc = 1 khz
description of the audio processor tda7419 24/40 4.8 treble there are two parameters programmable in the treble stage: 4.8.1 attenuation figure 16 shows the attenuation as a function of frequency at a center frequency of 17.5 khz. figure 16. treble control @ f c = 17.5 khz 4.8.2 center frequency figure 17 shows the four possible center fre quencies 10k, 12.5k, 15k and 17.5 khz. figure 17. 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
tda7419 description of the audio processor 25/40 4.9 subwoofer filter the subwoofer lowpass filter has butterworth characteristics with programmable cut-off frequency (80/120/160 hz) figure 18. subwoofer control 4.10 spectrum analyzer a fully integrated seven-band spectrum analyzer with programmable quality factor is present. the spectrum analyzer consists of seven band pass filters with rectifier and sample capacitor that stores the maximum peak signal level since the last read cycle. this peak signal level can be read by a microprocessor at the saout pin. to allow easy interfacing to an analog port of the microprocessor, the output voltage at this pin is referred to device ground. the microprocessor starts a read cycle with the negative going clock edge at the saclk input. on the following positive clock edges, the peak signal level for the band pass filters is subsequently switched to saout. each analog output data is valid after the time t sadel . a reset of the sample capacitors is induced whenever saclk remains high for the time t intres . note that a proper reset requires the clock signal saclk to be held at high potential. figure 20 shows the block diagram and figure 21 illust rates the read cycle ti ming of the spectrum analyzer. figure 19. spectrum analyzer block diagram
description of the audio processor tda7419 26/40 figure 20. timing of the spectrum analyzer 4.11 ac coupling in some applications additional signal manipulations are desired, such as additional band equalizations. for this purpose, an ac coupling can be placed before the loudness attenuator or speaker-attenuators, which can be activated or internally shorted by 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 50 k . figure 21. diagram of ac coupling to output acinl acinr acoutr acoutl from input mux filters ingain speakers
tda7419 description of the audio processor 27/40 4.12 hpf applications for hpf applications, hpf filter is available for additional processing after the speaker control. it is a 2 nd order butterworth highpass filter with selectable flat mode. figure 22 shows the diagram of the hpf that includes an external rc network. figure 22. hpf diagram 4.13 output selector and mixing the output-selector allows the front and rear speakers to connect to different sources. the setup of the output selector is shown in figure 24. a mixing-stage is placed after the front speaker-attenuator and can be set to mixing-mode. having a full volume-attenuator for the mix-signal, the stage offers a wide fl exibility to adapt the mixing levels. figure 23. output selector acin /filo se3in /ac2in acout /ac2out external rc network to output gain control from speaker bassl+bassr subwoofe r output rear front second main mix_in attenuator attenuator attenuator subwoofer filter attenuator
description of the audio processor tda7419 28/40 4.14 audioprocessor testing in the test mode, which can be activated by setting bit d7 of the iic subaddress byte and bit d0 of the testing audioprocessor byte, several internal signals are available at the se1r pin. in this mode, the input resistance of 100kohm is disconnected from the pin. internal signals available for testing are listed in the data-byte specification. 4.15 test circuit figure 24. test circuit
tda7419 i 2 c bus specification 29/40 5 i 2 c bus specification 5.1 interface protocol the interface protocol comprises: a start condition (s) a chip address byte (the lsb 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 3.3 v logic compatible 5.1.1 receive mode s = start r/w = "0" -> receive mode (chip can be programmed by p) "1" -> transmission mode (data could be received by p) ack = acknowledge p = stop ts = testing mode az = autozero remain ai = auto increment 5.1.2 transmission mode sm = soft-mute activated for main channel x = not used the transmitted data is automatic updated after each ack. transmission can be repeated without new chip address. 5.1.3 reset condition a power on reset is invoked if the supply volta ge is below than 3.5 v. after that the following data is written automatically into the registers of all subaddresses: s 1 0 0 0 1 0 0 r/w ack ts az ai a4 a3 a2 a1 a0 ack data ack p s1000100r/wackxxxxxxxsmackp msb lsb 11111110
i 2 c bus specification tda7419 30/40 5.2 subaddress (receive mode) table 7. subaddress (receive mode msb lsb function i2 i1 i0 a4 a3 a2 a1 a0 0 1 testing mode off on 0 1 autozero remain off on 0 1 auto increment mode off on 0 0 0 0 0 main source selector 0 0 0 0 1 main loudness 0 0 0 1 0 soft-mute / clock generator 000 1 1volume 001 0 0treble 001 0 1middle 001 1 0bass 0 0 1 1 1 second source selector 0 1 0 0 0 subwoofer / middle / bass 0 1 0 0 1 mixing / gain effect 0 1 0 1 0 speaker attenuator left front 0 1 0 1 1 speaker attenuator right front 0 1 1 0 0 speaker attenuator left rear 0 1 1 0 1 speaker attenuator right rear 0 1 1 1 0 mixing level control 0 1 1 1 1 subwoofer attenuator 1 0 0 0 0 spectrum analyzer / clock source / ac mode 1 0 0 0 1 testing audio processor
tda7419 i 2 c bus specification 31/40 5.3 data byte specification table 8. main selector (0) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 x source selector qd/se: qd se1 se2 se3 qd/se: se mute mute 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 input gain 0 db 1 db : 14 db 15 db 0 1 autozero on off table 9. main loudness (1) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 attenuation 0 db -1 db : -14 db -1 5db 0 0 1 1 0 1 0 1 center frequency flat 400 hz 800 hz 2400 hz 0 1 high boost on off 0 1 loudness soft-step on off
i 2 c bus specification tda7419 32/40 table 10. soft-mute / clock generator (2) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 soft-mute on off 0 1 pin influence for mute pin and iic iic 0 0 1 0 1 x soft-mute time 0.48 ms 0.96 ms 123 ms 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 soft-step time 0.160 ms 0.321 ms 0. 642 ms 1.2 8ms 2.56 ms 5.12 ms 10.24 ms 20.48 ms 0 1 clock fast mode on off table 11. volume / speaker / mixing / subwoofer attenuation (3, 10-15) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 0 : 1 1 1 0 0 : 0 0 0 : 0 0 1 0 0 : 0 1 1 : 1 1 x 0 0 : 1 0 0 : 1 1 x 0 0 : 1 0 0 : 1 1 x 0 0 : 1 0 0 : 1 1 x 0 1 : 1 0 1 : 0 1 x gain/attenuation +0 db +1 db : +15 db -0 db -1 db : -78 db -79 db mute 0 1 soft-step on off
tda7419 i 2 c bus specification 33/40 table 12. treble filter (4) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 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 0 : 1 0 0 1 : 0 1 gain/attenuation -15 db -14 db : -1 db 0 db 0 db +1 db : +14 db +15 db 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 reference output select external vref (4 v) internal vref (3.3 v) table 13. middle filter (5) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 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 0 : 1 0 0 1 : 0 1 gain/attenuation -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 middle q factor 0.5 0.75 1 1.25 0 1 middle soft-step on off
i 2 c bus specification tda7419 34/40 table 14. bass filter (6) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 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 0 : 1 0 0 1 : 0 1 gain/attenuation -15 db -14 db : -1 db 0 db 0 db +1 db : +14 db +15 db 0 0 1 1 0 1 0 1 bass q factor 1.0 1.25 1.5 2.0 0 1 bass soft-step on off table 15. second source selector (7) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 x source selector qd/se: qd se1 se2 se3 qd/se: se mute mute 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 input gain 0db 1db : 14db 15db 0 1 rear speaker source main source second source
tda7419 i 2 c bus specification 35/40 table 16. subwoofer /middle / bass (8) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 1 1 0 1 0 1 subwoofer cut-off frequency flat 80 hz 120 hz 160 hz 0 0 1 1 0 1 0 1 middle center frequency 500 hz 1000 hz 1500 hz 2500 hz 0 0 1 1 0 1 0 1 bass center frequency 60 hz 80 hz 100 hz 200 hz 0 1 bass dc mode on off 0 1 smoothing filter on off (bypass)
i 2 c bus specification tda7419 36/40 table 17. mixing / gain effect (9) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 mixing to left front speaker on off 0 1 mixing to right front speaker on off 0 1 mixing enable on off 0 1 s ubwoofer enable (outlr2 & outrr2) on off 0 0 : 1 1 1 1 0 0 : 0 0 0 1 0 0 : 0 0 1 x 0 1 : 0 1 x x gain effect for hpf filter 4 db 6 db : 20 db 22 db 0 db 0 db table 18. spectrum analyzer / clock source / ac mode (16) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 spectrum analyzer filter q factor 3.5 1.75 0 1 reset mode iic auto 0 1 spectrum analyzer source bass in gain 0 1 spectrum analyzer run on off 0 1 reset on off
tda7419 i 2 c bus specification 37/40 0 1 clock source internal external 0 0 1 1 0 1 0 1 coupling mode dc coupling (without hpf) ac coupling after in gain dc coupling (with hpf) ac coupling after bass table 18. spectrum analyzer / clock source / ac mode (16) (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 19. testing audio processor (17) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 audio processor testing 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 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 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 x x x x x x x x test multiplexer left in gain left in gain left loudness left loudness left volume left volume left treble left treble left middle smclk left bass vrefscr vgb1.26 ssclk clock200 mon ref5v5 bpout<1> bpout<2> bpout<3> bpout<4> bpout<5> bpout<6> bpout<7> xx not used
package information tda7419 38/40 6 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 25. 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
tda7419 revision history 39/40 7 revision history table 20. document revision history date revision changes 20-nov-2004 1 initial release. 16-mar-2005 2 inserted new values in electrical characteristics table. 10-jun-2005 3 modified the figure 2 block diagram. 08-oct-2005 4 minor correction 13-dec-2005 5 updated ?absolute maximum ratings? table 3 and ?supply? table 2. 13-feb-2009 6 document reformatted. updated section 6: package information on page 38 .
tda7419 40/40 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. ? 2009 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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