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TDA7314 digital controlled audio processor with loudness 1 stereo input selectable input gain for optimal adaption to different sources input and output for external equalizer or noise reduction sys- tem loudness function volume control in 1.25db steps treble and bass control four speaker attenuators: - 4 independent speakers control in 1.25db steps for balance and fader facilities - independent mute function all functions programmable via se- rial bus description the TDA7314 is a volume, tone (bass and treble) balance (left/right) and fader (front/rear) processor for quality audio applications in car radio and hi-fi systems. selectable input gain and internal loudness function are provided. control is accomplished by serial bus microprocessor interface. the ac signal setting is obtained by resistor networks and switches combined with operational amplifiers. thanks to the used bipolar/cmos tecnology, low distortion, low noise and dc stepping are ob- tained. november 1999 ? sdip24 ordering number: TDA7314 pin connection (top view) 1/12
thermal data symbol description value unit r th j-pins thermal resistance junction-pins max. 65 c/w quick reference data symbol parameter min. typ. max. unit v s supply voltage 6 9 10 v v cl max. input signal handling 2 vrms thd total harmonic distortion v = 1vrms f = 1khz 0.01 0.1 % s/n signal to noise ratio 106 db s c channel separation f = 1khz 103 db volume control 1.25db step -78.75 0 db bass and treble control 2db step -14 +14 db fader and balance control 1.25db step -38.75 0 db input gain 6.25db step 0 18.75 db mute attenuation 100 db absolute maximum ratings symbol parameter value unit v s operating supply voltage 10.2 v t amb operating ambient temperature -40 to 85 c t stg storage temperature range -55 to +150 c test circuit TDA7314 2/12
block diagram TDA7314 3/12
electrical characteristics (refer to the test circuit t amb = 25c, v s = 9v, r l = 10k w , r g = 600 w , all controls flat (g = 0), f = 1khz unless otherwise specified) symbol parameter test condition min. typ. max. unit supply v s supply voltage 6 9 10 v i s supply current 8 11 ma svr ripple rejection 60 80 db input stage r ii input resistance pin 9, 11 35 50 70 k w v cl clipping level 2 2.5 vrms r l output load resistance pin 7, 17 2 k w g inmin min. input gain -1 0 1 db g inmax max. input gain 18.75 db g step step resolution 6.25 db e in input noise g = 18.75db 2 m v v dc dc steps adjacent gain steps 4 20 mv g = 18.75 to mute 4 mv volume control r iv input resistance 20 33 50 k w c range control range 70 75 80 db a vmin min. attenuation -1 0 1 db a vmax max. attenuation 70 75 80 db a step step resolution 0.5 1.25 1.75 db e a attenuation set error av = 0 to -20db av = -20 to -60db -1.25 -3 0 1.25 2 db db e t tracking error 2db v dc dc steps adjacent attenuation steps from 0db to av max 0 0.5 3 7.5 mv mv speaker attenuators c range control range 35 37.5 40 db s step step resolution 0.5 1.25 1.75 db e a attenuation set error 1.5 db a mute output mute attenuation 80 100 db v dc dc steps adjacent att. steps from 0 to mute 0 1 3 10 mv mv bass control (1) gb control range max. boost/cut +12 +14 +16 db b step step resolution 1 2 3 db r b internal feedback resistance 34 44 58 k w treble control (1) gt control range max. boost/cut +13 +14 +15 db t step step resolution 1 2 3 db TDA7314 4/12
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit audio outputs v ocl clipping level d = 0.3% 2 2.5 vrms r l output load resistance 2 k w c l output load capacitance 10 nf r out output resistance 30 75 120 w v out dc voltage level 4.2 4.5 4.8 v general e no output noise bw = 20-20khz, flat output muted all gains = 0db 2.5 515 m v m v a curve all gains = 0db 3 m v s/n signal to noise ratio all gains = 0db; v o = 1vrms 106 db d distortion a v = 0, v in = 1vrms a v = -20db v in = 1vrms v in = 0.3vrms 0.01 0.09 0.04 0.1 0.3 % % % sc channel separation left/right 80 103 db total tracking error a v = 0 to -20db -20 to -60 db 0 0 1 2 db db bus inputs v il input low voltage 1 v v ih input high voltage 3 v i in input current -5 +5 m a v o output voltage sda acknowledge i o = 1.6ma 0.4 v note: (1) bass and treble response see attached diagram (fig.19). the center frequency and quality of the resonance behaviour can be choosen by the external circuitry. a standard first order bass response can be realized by a standard feedback network. figure 1: loudness versus volume attenuation figure 2: loudness versus frequency (c loud = 100nf) TDA7314 5/12
figure 6: distortion & noise vs. frequency figure 7: distortion & noise vs. frequency figure 8: distortion vs. load resistance figure 4: noise vs. volume/gain settings figure 5: signal to noise ratio vs. volume setting figure 3: loudness versus external capacitors loudness v s = 9v volume = -40db all other control flat c in = 2.2 m f c loud = 220nf, 100nf, 33nf, 10nf, open, shorter to vref TDA7314 6/12
figure 11: output clipping level vs. supply voltage figure 13: supply current vs. temperature figure 12: quiescent current vs. supply voltage figure 9: channel separation (l ? r) vs. frequency figure 10: supply voltage rejection vs. frequency figure 14: bass resistance vs. temperature TDA7314 7/12
software specification interface protocol the interface protocol comprises: a start condition (s) a chip address byte, containing the TDA7314 address (the 8th bit of the byte must be 0). the TDA7314 must always acknowledge at the end of each transmitted byte. a sequence of data (n-bytes + acknowledge) a stop condition (p) TDA7314 address msb first byte lsb msb lsb msb lsb s10001000 ack data ack data ack p data transferred (n-bytes + acknowledge) ack = acknowledge s = start p = stop max clock speed 100kbits/s software specification chip address 1 msb 0001000 lsb data bytes msb lsb function 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 1 b2 0 1 0 1 0 1 1 b1 b1 b1 b1 b1 g1 0 1 b0 b0 b0 b0 b0 g0 c3 c3 a2 a2 a2 a2 a2 s2 c2 c2 a1 a1 a1 a1 a1 s1 c1 c1 a0 a0 a0 a0 a0 s0 c0 c0 volume control speaker att lr speaker att rr speaker att lf speaker att rf audio switch bass control treble control ax = 1.25db steps; bx = 10db steps; cx = 2db steps; gx = 6.25db steps figure 15: typical tone response (with the ext. components indicated in the test circuit) TDA7314 8/12
software specification (continued) data bytes (detailed description) volume msb lsb function 0 0 b2 b1 b0 a2 a1 a0 volume 1.25db steps 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 -1.25 -2.5 -3.75 -5 -6.25 -7.5 -8.75 0 0 b2 b1 b0 a2 a1 a0 volume 10db steps 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 -10 -20 -30 -40 -50 -60 -70 for example a volume of -45db is given by: 0 0 1 0 0 1 0 0 speaker attenuators msb lsb function 1 1 1 1 0 0 1 1 0 1 0 1 b1 b1 b1 b1 b0 b0 b0 b0 a2 a2 a2 a2 a1 a1 a1 a1 a0 a0 a0 a0 speaker lf speaker rf speaker lr speaker rr 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 -1.25 -2.5 -3.75 -5 -6.25 -7.5 -8.75 0 0 1 1 0 1 0 1 0 -10 -20 -30 11111 mute for example attenuation of 25db on speaker rf is given by: 1 0 1 1 0 1 0 0 TDA7314 9/12
audio switch msb lsb function 0 1 0 g1 g0 s2 s1 s0 audio switch 0 1 0 0 1 1 0 1 0 1 stereo 1 stereo 2 (mute) (*) stereo 3 (mute) (*) stereo 4 (mute) (*) loudness on loudness off 0 0 1 1 0 1 0 1 +18.75db +12.5db +6.25db 0db for example to select the stereo 1 input with a gain of +12.5db, loudness on, the 8 bit string is: 0 1 0 0 1 0 0 0 (*) stereo 2, 3, 4 are connected internally but not available on pins. bass and treble 0 0 1 1 1 1 0 1 c3 c3 c2 c2 c1 c1 c0 c0 bass treble 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 1 0 1 0 1 0 1 0 -14 -12 -10 -8 -6 -4 -2 0 0 2 4 6 8 10 12 14 c3 = sign for example bass at -10db is obtained by the following 8 bit string: 0 1 1 0 0 0 1 0 TDA7314 10/12
dim. mm inch min. typ. max. min. typ. max. a 5.08 0.20 a1 0.51 0.020 a2 3.05 3.30 4.57 0.120 0.130 0.180 b 0.36 0.46 0.56 0.0142 0.0181 0.0220 b1 0.76 1.02 1.14 0.030 0.040 0.045 c 0.23 0.25 0.38 0.009 0.0098 0.0150 d 22.61 22.86 23.11 0.890 0.90 0.910 e 7.62 8.64 0.30 0.340 e1 6.10 6.40 6.86 0.240 0.252 0.270 e 1.778 0.070 e1 7.62 0.30 e2 10.92 0.430 e3 1.52 0.060 l 2.54 3.30 3.81 0.10 0.130 0.150 sdip24 (0.300") stand-off a1 b e b1 d 13 12 24 1 f la e1 a2 c e1 e e2 gage plane .015 0,38 e2 e3 e sdip24 outline and mechanical data TDA7314 11/12
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsib ility for the cons equences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this pu blication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectron ics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicr oelectronics. the st logo is a registered trademark of stmicroelectronics ? 1999 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com TDA7314 12/12

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