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TDA7285 stereo cassette player and motor speed controller wide operating supply voltage (1.8v to 6v) high output power (30mw/32 w /3v) low distortion dc volume control no boucherot cell low quiescent current (15ma) no input capacitors for preamplifi- ers low motor reference voltage (200mv) description the TDA7285 is a monolithic integrated circuit designed for the portable players market and as- sembled in a plastic dip20 and so20. the inter- nal functions are: preamplifier, dc volume con- trol, headphone driver and motor speed control- ler. may 1997 block diagram dip20 so20 ordering numbers: TDA7285 TDA7285d 1/11
pin connection (top view) absolute maximum ratings symbol parameter value unit v s supply voltage 8 v i omax maximum output current 70 ma i m max maximum motor current 700 ma p tot total power dissipation t amb =90 c 0.9 w t op operating temperature -20 to +70 c t stg ,t j storage and junction temperature -40 to 150 c thermal data symbol description so20 dip20 unit r th j-amb thermal resistance junction-ambient 150 100 c/w dc characteristics (t amb =25 c; v s = 3v; r l =32 w (headphone) and r l = 10k w (preamplifier); v i = 0; vol. control = v ref ). terminal no 1234567891011121314151617181920 term. volt. (v) 0 1.5 1.5 1.5 1.5 2.7 1.4 0 2.8 0 1.6 3 3 1.4 1.5 1.5 1.5 1.5 1.5 1.5 TDA7285 2/11
electrical characteristics (v s = 3v; r l =32 w , vol. control = 2/3 v ref (pin 20) ;t amb =25 c; f = 1khz; unless otherwise specified symbol parameter test condition min. typ. max. unit v s supply range 1.8 6 v i d total quiescent drain current 15 22 ma playback amplifier g vo open loop gain 70 db g v close loop gain 33 db v o output voltage thd = 1% 600 750 mv thd total harmonic distortion v o = 330mvrms 0.05 0.25 % i b bias current 3 m a c t cross talk r s = 2.2k w ;v o = 330mvrms 74 db e n total input noise r s = 2.2k w ; b = 22hz to 22khz 1.2 m v svr1 ripple rejection r s = 2.2k w ; vr = 100mvrms f = 100hz; c svr = 100 m f 50 db headphone driver v dc output dc voltage 1.4 v p o output power thd = 10% 20 30 mw p o1 transient output power thd = 10% r l =16 w 50 mw g v close loop gain p o = 5mw 31 db volume control range 66 75 db thd total harmonic distortion p o = 5mw 0.3 1 % c t cross talk p o =5mw;r s = 10k w 50 db svr2 ripple rejection r s = 600 w ; vr = 100mv f = 100hz; c svr = 100 m f 47 db motor speed control v ref motor reference voltage (pin 12) 0.18 0.20 0.22 v k shunt ratio i m = 100ma 45 50 55 - v sat residual voltage i m = 100ma 0.13 0.30 v d v ref v ref M d v s line regulation i m = 100ma; v s = 1.8 to 6v 0.20 0.8 %/v d k k M d v s voltage characteristics of shunt ratio i m = 100ma; v s = 1.8 to 6v 0.80 3 %/v d v ref v ref M d i m load regulation i m = 30 to 200ma 0.015 0.08 %/ma d k k M d i m current characteristics of shunt ratio i m = 30 to 200ma 0.03 0.1 %/ma d v ref v ref M d t amb temperature characteristics of reference voltage i m = 100ma t amb = -20 to +60 c 0.04 %/ c d k k M d t amb temperature characteristics of shunt ratio i m = 100ma t amb = -20 to +60 c 0.02 %/ c TDA7285 3/11
figure 1: test and application circuit figure 2: p.c. board and component layout of the circuit of figure 2 (1:1 scale) TDA7285 4/11
figure 3: quiescent drain current vs. supply voltage figure 4: reference voltage v s /2 (pin 20) vs. supply voltage figure 5: closed loop gain vs. frequency (preamplifier) figure 6: distortion vs. frequency (preamplifier) figure 7: supply voltage rejection vs. frequency (preamplifier) figure 8: quiescent output voltage vs. supply voltage (driver) v s =3v v o = 330mvrms r l = 10k w v s =3v r s = 2.2k w v r = 100mvrms c svr = 100 m f TDA7285 5/11
figure 9: closed loop gain vs. frequency (driver) figure 10: output power vs. supply voltage (driver) figure 11: distortion vs. output power (driver) figure 12: distortion vs. frequency (driver) figure 13: supply voltage rejection vs. frequency (driver figure 14: volume control (0db = 10mw; v s = 3v; r vol = 50k w ;r l =32 w ; f = 1khz) (driver) v s =3v r s = 600 w v r = 100mvrms c svr = 100 m f TDA7285 6/11
figure 15: reference voltage (pin 12) vs. sup- ply voltage (motor) figure 16: shunt ratio vs. supply voltage (mo- tor) figure 17: sunt ratio vs. load current (motor) figure 18: saturation voltage vs. load current (motor) figure 19: speed variations vs. supply voltage (motor) figure 20: speed variations vs. motor current (motor) TDA7285 7/11
e g = r t i d + i m ( r t k - r m )+ v ref [1 + r b r s + r t r s ( 1 + 1 k ) ] r s has to be adjusted so that the applied voltage v m is suitable for a given motor, the speed is then linearly adjustable varing r b . the value r t is calculated so that r t (max.) >k (min.) *r m (min.) if r t (max.) >k*r m , instability may occur. the values of c15 (4.7 m f typ.) and c14 (1 m f typ.) depend on the type of motor used. c15 ad- justs wow and flutter of the system. c14 sup- presses motor spikes. application information figure 21. TDA7285 8/11
so20 package mechanical data dim. mm inch min. typ. max. min. typ. max. a 2.65 0.104 a1 0.1 0.3 0.004 0.012 a2 2.45 0.096 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 12.6 13.0 0.496 0.512 e 10 10.65 0.394 0.419 e 1.27 0.050 e3 11.43 0.450 f 7.4 7.6 0.291 0.299 l 0.5 1.27 0.020 0.050 m 0.75 0.030 s 8 (max.) TDA7285 9/11
dip20 package mechanical data dim. mm inch min. typ. max. min. typ. max. a1 0.254 0.010 b 1.39 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 d 25.4 1.000 e 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 f 7.1 0.280 i 3.93 0.155 l 3.3 0.130 z 1.34 0.053 TDA7285 10/11
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences 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 sgs-thomson microelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. sgs- thomson microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of sgs-thomson microelectronics. ? 1997 sgs-thomson microelectronics printed in italy all rights reserved sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. TDA7285 11/11

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