utc TA7784P linear integrated circuit utc unisonic technologies co., ltd. 1 qw-r110-010,a dual pre-amplifier for auto-reverse description the utc TA7784P is a dual pre-amplifier for auto-reverse type and w-cassette type tape player. this ic contains dual pre-amplifier, forward/ reverse control switches and metal/ normal tape equalizer control switches. features *high voltage gain: g vo =95db(typ) at vcc=6v f=1khz *wide operating supply voltage(v cc = 3.5v~15v) *no input coupling capacitor *low noise( vni=1 vrms(typ) at rg=600 ? , bw=20hz~20khz, nab eq) dip-16 block diagram
utc TA7784P linear integrated circuit utc unisonic technologies co., ltd. 2 qw-r110-010,a absolute maximun ratings (ta=25 c) parameter symbol value unit supply voltage vcc 16 v power dissipation pd 750 mw operating temperature topr -25~75 c storage temperature tstg -55~150 c note: de-rated above ta=25 c in the proportion of 6mw/ c. electrical characteristics (ta=25 c,vcc=6v,rg=600 ? , f=1khz, unless otherwise specified parameter symbol test circuit test conditions min typ max unit quiescent current iccq1 1 vin=0, normal eq 5.5 ma iccq1 1 vin=0, metal eq 7 11 open loop voltage gain gvo 1 cf=100 f,rf=0 95 db maximum output voltage vom 1 thd=0.5% 1.1 1.5 vrms total harmonic distortion thd 1 vout=0.5vrms 0.035 0.12 % equivalent input noise vni 1 rg=620 ? ,nab bw:20hz~20khz metal eq 1 1.7 vrms ripple rejection rr 1 f=100hz,vin=1vrms 55 db cross talk ct 1 vout=0dbm 50 60 db forward/ reverse cross talk ct(f/r) vout=0dbm 60 70 db
utc TA7784P linear integrated circuit utc unisonic technologies co., ltd. 3 qw-r110-010,a test circuit (pin configuration and dc voltage bias 15 3 8 16 14 12 11 13 9 7 5 4 2 6 1 sg 10 ch2 out f/r sw eq sw ch1 out r nf =330k ? r f =180k ? c7 0.01 f r4=18k ? r3=12k ? 100 f c f =22 f sw1-2 sw2-2 r9 620 ? x4 c5 c4 c3 r8 r7 c 1 =100 f rg r6 sw2-1 r4=18k ? r3=12k ? r nf =330k ? r f =180k ? 100 f c f =22 f sw1-1 c6 0.01 f c8 4.7 f r l =10k ? c10 100 f r l =10k ? c8 4.7 f 1 f 47k ? vcc m n f r vcc *gvo test: sw1-1, 2: off, sw2-1, 2:b a b a b amp amp pin configuration and dc voltage( vcc=6v, ta=25 c, unless otherwise specified) dc voltage pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 value (v) vcc 2.3 vcc/gnd 2.2 2.2 2.2 2.2 gnd 2.2 nc 2.2 2.2 2.2 2.2 vcc/gnd 2.2
utc TA7784P linear integrated circuit utc unisonic technologies co., ltd. 4 qw-r110-010,a application information 1.forward/reverse select switch 1 threshold voltage: pin 3 is coupled to the base of q1( pnp-tr) as fig. 1 the threshold voltage is 0~0.3v at reverse stage and is 1.1~vcc at the forward stage. 2 the recommended forward/ reverse select circuit is shown in fig. 2 3 i3(fig. 1)=12 a,ta=25 c 3 i e =100 a i 3 fig 1 2.equalizer control switch pin 15 is coupled to the base of q2( pnp tr) as shown fig. 3. the emitter potential of q2 is 2.6v. the threshold voltage is 21~vcc at metal eq stage and is 0~1.2v at the normal eq stage. 3 30~50w 1 f f r 1.5v fig 2 3.c2/c3/c4/c5 capacitor c2~c5 may be required for preventing a instability caused by the pattern layout or interference of external high frequency signal. 15 2.6v fig 3 utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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