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TDA7335 stereo preamp + ams + dolby b* noise reduction processor dual channel processor for play- back applications. stereo dolby b nr system low noise head preamplifier mute, autoreverse, ams (audio mu- sic sensor) functions internal switches for equalization dolby reference level -6dbm (388.2mv rms ) minimum number of external compo- nents low supply current (18ma) mixed bipolar/cmos technology description the TDA7335 is a monolithic bicmos ic de- signed for use in stereo cassette player systems. the device includes two separate audio channels composed by low noise preamplifier, dolby b noise reduction system and audio music sensor. the dual preamplifier contains mute, autoreverse, metal/normal facilities for amplification of low level signal in applications requiring very low noise per- formances. each channel consists of two cascaded opera- tional amplifiers. the first one, amp1, has a fixed gain of 36db, low noise forward/reverse switchable input, and allows magnetic heads connection directly to ground. the second one, amp2, is a standard op- erational amplifier whose equalizing external components fix the frequency response. the audio music sensor circuit detects the inter- program space and then the starting point of mu- sical programs (the interprogram time and pro- gram detection time are externally selectable). the device contains dolby b decoder nr chains requiring very few external components and do not require coils. * dolby b and the double-d symbol are trademarks of dolby laboratories li- censing corporation, san francisco, california 94103-4813, usa. this device is available only to licens- ing and application information may be obtained from dolby lab. november 1999 ? pin connection (top view) sdip30 ordering number: TDA7335 1/20
absolute maximum ratings symbol parameter value unit v s supply voltage 12 v p tot total power dissipation 1 w t op operating temperature range -40 to 85 c t stg storage temperature range -40 to 150 c thermal data r th j-pins thermal resistance junction-pins 85 c/w pin functions n. name v dc (v) function 1 gnd ground 2,3 in l 1 , in l 2 0 preamplifier left inputs 1,2 4,27 eqli, eqri 4.6 equalizer inputs 5, 26 eqlo, eqro 4.6 equalizer outputs 6, 25 outl, outr 4.6 preamplifier outputs 7, 24 dinl, dinr v ref dolby nr inputs 8 ams sw 5.6 audio music sensor switch (on/off) high = on 9 intp interprogram time constant ("signal detection") 10 ints interspace time constant ("blank detection") 11 mute mute switch on = low (2) 12, 19 tlc, tcr 0.4 dolby time constants 13, 18 doutl, doutr v ref dolby outputs 14 i ref 1.2 reference current source 15 f/r sw 5.6 forward/reverse switch high = forward low = reverse 16 v s positive power supply 17 v ref v s /2 reference voltage 20 nr sw noise reduction on/off: high = off (2) 21 ams gin 1.4 audio music sensor input pin 22 ams out audio music sensor output pin (open collector configuration, see fig. 2) 23 gnd dig. 0 digital ground 28, 29 in r 1 , in r 2 0 preamplifier right inputs 1,2 30 eq sw 0 equalizer switch (low = normal position high = metal position) (2) internal pull-up resistor (digital high level if pin left open) TDA7335 2/20
ams 10nf c4 6.8k r5 300k r6 1.2k r2 1k tr2 1 m f c2 0.33 m f c6(*) eqri eqro outr 27 26 rm rn 36db amp1 amp2 28 inr2 input r dinr 15 25 0.22 m f c8 r8 10k amsgin 21 23 amsout 22 r10 100k vs dolby 19 tcr 0.68 m f (*) c11 doutr outr 4.7 m f c13 bias 4.7 m f c14 r13 100k 0.22 m f c18 vs gnd v s 0.68 m f c19 nrsw v s 18 20 17 16 1 rn rm amp1 amp2 36db 3 input l inl2 1.2k 1.2k 4 5 30 6 300k r4 6.8k r3 1.2k r1 1k tr1 1 m f c1 10nf c3 eqli eqlo dolby 0.33 m f c5(*) 30k 0.68 m f c20 vs gnd outl dinl 7 470k r7 9 intp c7 0.1 m f 12 c9 1 m f v s 100k r9 tcl 10 ints 0.68 m f (*) 13 doutl c16 100nf outl gnd vref r11 43k 2% d94au095b 14 iref eq sw c10 (*) capacitor tolerance is 10% inr1 29 inl1 2 0.68 m f c17 30k v s gnd f/r sw 24 r15 30k vs gnd 11 c12 4.7 m f mute c15 10nf amssw 8 r12 r14 figure 1: application circuit TDA7335 3/20
figure 1a: components & top copper layer of the fig. 1 (1:1 scale). figure 1b: bottom copper layer of the fig. 1 (1:1 scale). TDA7335 4/20
ams 10nf c4 6.8k r5 300k r6 1.8k r2 1 m f c2 0.33 m f c6(*) eqri eqro outr 27 26 rm rn 36db amp1 amp2 28 inr2 dinr 15 25 0.22 m f c8 r8 10k amsgin 21 23 amsout 22 r10 100k v s dolby 19 tcr 0.68 m f (*) c11 doutr outr 4.7 m f c13 bias 4.7 m f c14 0.22 m f c18 v s gnd v s nrsw v s 18 20 17 16 1 rn rm amp1 amp2 36db 3 inl2 1.2k 1.2k 4 5 30 6 300k r4 6.8k r3 1.8k r1 1 m f c1 10nf c3 eqli eqlo dolby 0.33 m f c5(*) v s gnd outl dinl 7 470k r7 9 intp c7 0.1 m f 12 c9 1 m f v s 100k r9 tcl 10 ints 0.68 m f (*) 13 doutl outl gnd vref r11 43k d94au097a 14 iref eq sw c10 (*) capacitor tolerance is 10% inr1 29 inl1 2 f/r sw 24 11 c12 4.7 m f mute c15 10nf amssw 8 300pf input r 600 w 300pf 600 w 300pf 600 w 300pf 600 w input l test circuit TDA7335 5/20
electrical characteristics (v s = 8.5v; f = 1khz; r g = 600 w ; t amb = 25 c; r 11 = 43k w ; all level referenced to -6dbm/400hz, at d out with nr sw off; unless otherwise specified see application circuit of fig. 1) nab metal position. supply symbol parameter test condition min. typ. max. unit v s supply voltage 8 8.5 10.5 v i s supply current 11 18 26 ma v ref reference voltage (pin 17) 4 4.3 4.6 v v dc dc voltage pin 14 (r11 = 43k) 1.15 1.25 1.35 v svr ripple rejection (input referred) v ripple = 0.3vrms dolby off f ripple = 1khz dolby on 80 85 90 95 db db mute th mute threshold pin11 on off 0 2.0 0.8 v s v v i mute mute current 10 20 m a mute a mute attenuation 55 65 db preamplifier symbol parameter test condition min. typ. max. unit r i input resistance (pin 2, 3, 28, 29) 30 50 70 k w i i input bias current 10 m a g v closed loop gain pin 4, 5 and 26, 27 shorted 32.5 35.5 38.5 db d g v closed loop gain match -1 1 db r m resistance metal position 4.35 5.8 7.25 k w d r m metal resistance matching -2 0 2 db r n resistance normal position 50 160 300 w e n total input noise unw. b = 20hz to 20khz; r g = 0 w r g = 600 w a weighted; r g = 600 w 0.45 0.8 0.5 m v m v m v r o output impedance (pin 6, 25) 0.9 1.2 1.7 k w f/r l reverse low level (pin 15) in 2 = on; in 1 = off 0 0.8 v f/r h forward high level (pin 15) in 2 = off; in 1 = on 2 v s v eq l normal low level (pin 30) 0 1.5 v eq h metal high level (pin 30) 3.5 v s v audio music sensor symbol parameter test condition min. typ. max. unit iams out ams output current 5 ma vams out ams output low level iam out = 2ma 200 800 mv r p 21 input impedance 0.8 1.1 1.4 k w ams swl ams off low level 0 0.8 v ams swh ams on high level 2 v s v v th1 interprogram threshold voltage (pin 9) 1.2 1.45 1.7 v vth 2 interspace threshold voltage (pin 10) 4 4.3 4.6 v ams th ams threshold level see note (3) 0.6 1 1.4 v iams sw ams switch pin current 5 10 15 m a dolby section symbol parameter test condition dolby min. typ. max. unit g v voltage gain f = 1khz; off -1 0 1 db d g v gain matching off -0.5 0.5 db rd i dolby input res. (pin 7, 24) 46 63 k w TDA7335 6/20
audio music sensor (see figure 2) aim of this section is to detect interprogram spaces present on a recorded tape. both the blanks (interprogram spaces) and the programs minimum detectable durations can be easily set by means of 2 external and inde- pendent time constants. also the minimum detectable input signal level can be externally adjusted, by a dedicated gain network. main blocks are: variable gain limiter amplifier signal detector circuitry logic blocks able to avoid unproper operations. operations description (refer to the simplified schematic of figure 2). a)the two channels left and right mean signal coming from the preamp chain (ac coupled) are added (current) at the ams input and pre- sented to the limiter amplifier. the limiter am- plifier gain is internally fixed to 40db, and it could be reduced by the r8 external resistor. the amsvth threshold is fixed at 1v. the fol- lowing signal detector comparator informs of the presence of music signal (high level out) and avoids the erroneous detection of very low signal (like noise) as real program. b)the system moves in blank detection mode everytime the supply is turned on or, with power supplied, the ams on/off pin (to be driven by an open collector output) is turned off (t 1 open). once this condition has hap- pened, the capacitor c 15 charges, defining a minimum reset time, long enough to reset the flip-flops ff 1 and ff 2 and to descharge the program detector external c 7 capacitor. the charging current at the ams sw pin is about 10 m a. it follows that the reset time (c 15 x v pin8 )/i c15 is given approximately by 0.122 x c 15 ns where c 15 is in m f. electrical characteristics (continued) dolby section symbol parameter test condition dolby min. typ. max. unit rd o dolby output impedance (pin 13, 18) 100 200 300 w s/h signal handling v s = 8v; thd = 1% off 12 13 db b dec 1 decode out f = 10khz; v i = 0.4db on -1.5 0 1.5 db b dec 2 decode out f = 500hz; v i = -22.1db on -26.5 -25 -23.5 db b dec 3 decode out f = 2khz; v i = -18db on -26.5 -25 -23.5 db b dec 4 decode out f = 5khz; v i = -29.7db on -41.5 -40 -38.5 db b dec 5 decode out f = 10khz; v i = -29.6db on -41.5 -40 -38.5 db nr l dolby on low level pin 20 0 0.8 v nr h dolby off high level pin 20 2 v s v general (preamplifier + dolby) symbol parameter test condition min. typ. max. unit thd total harmonic dist. v o = 0db; f = 1khz dolby off 0.02 0.1 % v o = 0db; f = 1khz dolby on 0.05 0.1 % v o = 0db; f = 10khz dolby off 0.03 % v o = 0db; f = 10khz dolby on 0.08 % s/n signal to noise ratio r g = 600 w ; v o = 0db; unweighted; dolby off 63 db r g = 600 w ; v o = 0db; unweighted; dolby on 70 db r g = 600 w ; v o = 0db; ccir/arm; dolby off 54 63 db r g = 600 w ; v o = 0db; ccir/arm; dolby on 56 72 db c s channel separation r g = 600 w ; f = 1khz dolby off 50 64 db r g = 600 w ; f = 1khz dolby on 70 db c t channel cross talk r g = 600 w ; f = 1khz dolby off 56 70 db r g = 600 w ; f = 1khz dolby on 75 db TDA7335 7/20
c)from now on where the sum input signal (left- right) amplified by the limiter exceeds the sig- nal detector threshold (3) the capacitor c 7 is forced to charge. when the voltage across this capacitor reaches the comparator comp 1 threshold voltage v th1 (approx. 2 v be ) ff 1 is set and ff 2 is reset. (4) it follows that q 1 is turned on discharging the program de- tection capacitor (c 7 ). d)always when there is a recorded zone, q 1 is on; it becomes off only if a blank section is reached. when, with a time constant control- led by the r 9 , c 9 network the voltage at space detection time pin reaches v th2 thresh- old (comparator comp 2 ) a true blank section is detected and the ff 2 is set. (the minimum charging time is approximately given by: 0.69 x c 9 x r 9 [sec] in this condition q 2 is on, forcing the open collector ams output to go low, informing the user that a true blank section has been detected. the state is then able to start from the above point c). figures 3-4 show the sig- nal behaviour. the device is able to prevent false interspace de- tection and the end of the tape. (see fig. 4). note : (3): minimum rms input signal is given by: v in = amsvth = 1k + r 8 101k + r 8 0.6 where v in is the mean of left and right channels: v in = v right + v left 2 (4): the charging current at pin 9 is about 20 m a (half input signal) so program detection time constant is given by: c 7 x 2v be 20 m a = 70 x c 7 [ m f] = [msec] it is recommended to insert a resistor (r7) high enough to prevent fast c7 capacitor discharging. ams gin rb 0.22 m f c8 in-l 21 1k 100k rp21 r9 + vs 6 25 in-r limiter amplifier vth0 - + signal detect. comparator vs power-on reset ams th nor1 q1 vth1 - + 22 ams out q ff2 s r - + comp1 comp2 vth2 q2 q ff1 r s q 0.1 m f c7 r7 500k program detection time t2 t1 c15 c9 r9 space detection time vs ints ams sw intp 23 9 d93au098 10 8 figure 2: audio music sensor TDA7335 8/20
figure 4 figure 3: ams timing diagram TDA7335 9/20
pins description : internal configuration electrical component description (see figure 1) component recommended value purpose p r e a m p tr 1 ,tr 2 c 1 , c 2 c 3 , c 4 r 1 , r 2 r 3 , r 5 r 4 , r 6 1k w 1 m f 10nf 1.2k w 6.8k w 300k w left/right channel in/out equalizer filter tr fixes the gain 150msec normal 70 m sec metal c 5 , c 6 0.33 m f 10% preamplifier out to dolby b input coupling capacitor a m s r 8 c 8 10k w 0.22 m f define the ams input threshold level v in 101k + r 8 1k + r 8 1.5 > 1v where v in = (v right + v left )/2 r 7 c 7 470k w 0.1 m f set the interprogram detection time: intp = 70 x 10 -3 x c 7 [ m f] = [sec] r 9 c 9 100k w 1 m f set the interspace detection time: ints = 0.69 x c 9 x r 9 sec c 15 0.1 m f it fixes music search reset time; tres = 0.122 x c 15 [ m f] = [sec] if c 15 expressed in m f d o l b y c 10 , c 11 0.68 m f 10% dolby output coupling capacitors c 12 , c 13 4.7 m f 10% dolby time constants c 14 4.7 m f reference voltage external capacitor r 11 43k w it fixes the i ref current c 16 r 16 0.1 m f 30k w if fixes the mute time (typ 10msec). figure 5: pins: 2 - 3 - 28 - 29 figure 6: pins: 7 - 24 TDA7335 10/20
pins description : internal configuration figure 9: pins: 4 - 27 figure 12: pins: 8 - 15 figure 11: pins: 6 - 25 figure 10: pins: 5 - 26 figure 7: pins: 13 - 18 figure 8: pin: 9 TDA7335 11/20
pins description : internal configuration figure 15: pin: 10 figure 18: pin: 30 figure 17: pin: 21 figure 16: pin: 22 figure 13: pins: 12 - 19 figure 14: pin: 14 TDA7335 12/20
pins description : internal configuration device characteristics figure 20: pin: 17 figure 19: pin: 20 - 11 figure 22: quiescent current vs. temperature figure 21: quiescent current vs. supply voltage figure 24: thd vs frequency figure 23: thd vs supply voltage TDA7335 13/20
device characteristics (continued) figure 28: cross talk vs. frequency figure 27: channel separation vs. frequency figure 30: ripple rejection vs. frequency figure 29: ripple rejection vs. frequency figure 26: thd + n vs. frequency figure 25: thd vs. output signal TDA7335 14/20
device characteristics (continued) figure 34: v ref. & i ref. vs. v supply figure 33: mute threshold figure 36: d.c. voltage pin 14 vs. v supply figure 35: v ref. & i ref. vs. temperature figure 32: mute attenuation vs. frequency figure 31: ripple rejection vs. frequency TDA7335 15/20
figure 40: load characteristcs figure 39: noise reduction threshold figure 42: signal handling vs. temperature figure 41: signal handling vs. v supply figire 38: forward/reverse threshold figure 37: equalizer threshold device characteristics (continued) TDA7335 16/20
figure 46: ams interprogram vs. c7 figure 45: ams reset time vs. c ex figure 48: interspace vs. c9 figure 47: interprogram charging current figure 44: ams threshold vs. r ex figure 43: ams threshold vs. frequency device characteristics (continued) TDA7335 17/20
device characteristics (continued) figure 50: dolby-b table figure 49: nab network normal metal TDA7335 18/20
sdip30 (0.400") dim. mm inch min. typ. max. min. typ. max. a 5.08 0.20 a1 0.51 0.020 a2 3.05 3.81 4.57 0.12 0.15 0.18 b 0.36 0.46 0.56 0.014 0.018 0.022 b1 0.76 0.99 1.40 0.030 0.039 0.055 c 0.20 0.25 0.36 0.008 0.01 0.014 d 27.43 27.94 28.45 1.08 1.10 1.12 e 10.16 10.41 11.05 0.400 0.410 0.435 e1 8.38 8.64 9.40 0.330 0.340 0.370 e 1.778 0.070 e1 10.16 0.400 l 2.54 3.30 3.81 0.10 0.13 0.15 m0 (min.), 15 (max.) s 0.31 0.012 outline and mechanical data TDA7335 19/20
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 TDA7335 20/20

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