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tda7334 low noise stereo preamplifier dual channel processor for play- back applications. low noise head preamplifier ground compatible mute, autoreverse metal/normal functions internal switches for equalization low supply current mixed bipolar/cmos technology description the tda7334 is a monolithic bicmos ic de- signed for use in stereo cassette player systems. the dual preamplifier contains mute, autoreverse, metal/normal facilities for amplification of low level signal in applications requiring very low noise per- formance. each channel consists of two cascaded opera- tional amplifiers. the first one, amp1, has a fixed gain of 32db, 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. november 1999 ? r12 300k r13 6.8k c4 10nf r11 1.2k c11 1 m f r15 6.2k eqro eqri c6 300pf inr2 input r r10 600 w c5 300pf r9 600 w inr1 12 13 14 15 c3 300pf r1 600 w c2 300pf r2 600 w inl1 inl2 2 3 r4 6.8k r5 300k c8 10nf r3 1.2k c1 1 m f eqli eqlo r14 6.2k 4 5 amp1 amp1 amp2 amp2 32db 32db rn rn 9 v s 1 gnd outr +v s c12 100nf c13 0.22 m f 20k +v s r7 10k f/rsw 11 8 7 mute c9 100nf 20k c14 0.22 m f outl eqsw 6 16 r8 10k gnd +v s d94au079 input l test circuit ordering number: tda7334 (dip16) tda7334d (so16) dip16 so16 1/11
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 dip 16 so16 r th j-pins thermal resistance junction-pins 100 200 c/w pin connection (top view) tda7334 2/11
r12 300k r13 6.8k c7 10nf r11 1.2k c11 1 m f r15 6.2k eqro eqri inr2 input r inr1 12 13 14 15 inl1 inl2 2 3 r4 6.8k r5 300k c8 10nf r3 1.2k c1 1 m f eqli eqlo r14 6.2k 4 5 amp1 amp1 amp2 amp2 32db 32db rn rn 9 v s 1 gnd outr +v s c12 100nf c13 0.22 m f v s r7 30k f/rsw 11 8 7 mute c9 0.68 m f c14 0.22 m f outl eqsw 6 16 d94au080 input l tr2 1k tr1 1k c10 0.68 m f gnd r6 30k r8 30k v s gnd c4 0.68 m f application circuit pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 dc (v) gnd 0 0 3.6 3.6 3.6 8.0 n.c. 3.6 3.6 3.6 0 0 p.c. board and component layout of the application circuit (1:1 scale) tda7334 3/11
electrical characteristics (v s = 8v;r in = 600 w ; f = 1khz; t amb = 25 c; unless other- wise specified (see figure 2) symbol parameter test condition min. typ. max. unit v s supply voltage 6 8 11 v i s supply current 7.5 9.0 ma svr ripple rejection input referred (ripple = 1v) 105 db mute th mute (pin 7) off on 0 3.5 0.8 v s v v mute a mute attenuation 60 80 db r i input resistance 100 k w v out dc output voltage dc 3.2 3.6 4.2 v i i input bias current 10 m a g vo open loop gain f = 400hz 110 db g v closed loop gain nab short 30 31 32.5 db d g v closed loop gain match nab short -1 1 db v om signal handling thd = 1%, v cc = 7.6v 1.8 2.0 vrms r n resistance normal position 100 300 w s r slew rate nab short 1 v/ m s e n total input noise r in = 600 w ; unweighted 0.8 m v r in = 600 w ; a weighted 0.5 m v r in = 0 ; unweighted 0.45 m v r o output resistance 1 k w f/r l rev. low level (pin 8) in2 = on; in1 = off 0 0.8 v f/r h forward high level (pin 8) in2 = off; in1 = on 3.5 v s v eq l normal low level (pin 16) 0 0.8 v eq h metal high level (pin 16) 3.5 v s v thd total harmonic distortion v o = 1v; f = 1khz metal 0.02 % v o = 1v; f = 1khz normal 0.02 0.1 % v o = 1v; f = 10khz metal 0.05 % v o = 1v; f = 10khz normal 0.04 % svr 1 ripple rejection nab short 75 db c s channel separation (l to r) 45 60 db c ct channel cross talk (f to r) 60 80 db s/n signal to noise v o = 388mv; metal 63 db tda7334 4/11
figure 1: quiescent current vs. supply figure 2: d.c. output vs. supply voltage figure 3: forward/reverse threshold figure 4: metal/normal threshold figure 5: mute threshold figure 6: mute attenuation vs. frequency tda7334 5/11
figure 7: mute attenuation vs. output level figure 8: thd vs. frequency figure 9: thd + n vs. frequency figure 10: thd vs. supply voltage figure 11: load characteristic figure 12: signal handling vs. supply voltage tda7334 6/11
figure 13: total input noise vs. input resistance figure 14: cross channel vs. frequency figure 15: cross talk vs. frequency figure 16: svr vs. frequency figure 17: svr vs. frequency figure 18: power bandwidth tda7334 7/11
figure 19: voltage gain vs. input voltage figure 20: nab network tda7334 8/11
dip16 dim. mm inch min. typ. max. min. typ. max. a1 0.51 0.020 b 0.77 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 d 20 0.787 e 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 f 7.1 0.280 i 5.1 0.201 l 3.3 0.130 z 1.27 0.050 outline and mechanical data tda7334 9/11
so16 narrow dim. mm inch min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.25 0.004 0.009 a2 1.6 0.063 b 0.35 0.46 0.014 0.018 b1 0.19 0.25 0.007 0.010 c 0.5 0.020 c1 45? (typ.) d (1) 9.8 10 0.386 0.394 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 f (1) 3.8 4 0.150 0.157 g 4.6 5.3 0.181 0.209 l 0.4 1.27 0.016 0.050 m 0.62 0.024 s (1) d and f do not include mold flash or protrusions. mold flash or potrusions shall not exceed 0.15mm (.006inch). outline and mechanical data 8?(max.) tda7334 10/11
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 tda7334 11/11

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