s ilicore shaoxing silicore technology co.,ltd www. silicore. com. cn chmc 1/5 dual channel pre-amp. with alc D7312CP description outline drawing the D7312CP is a monolithic integrated circuit designed for dual pre-amplifier circuit with alc for record /playback amplifier of cassette tape recorder. feature z high open loop gain z incorporates alc detector circuit z no input coupling condenser z low noise and current consumption z wide alc range z wide operating voltage range: vcc=5v ~ 12v low power on shock noise dip-14 block diagram and pin connection ripple filter alc ch2 amp 1 14 2 3 4 5 6 7 8 9 10 11 12 13 gnd alc time alc input output1 phase nf of ch1 input of ch1 of ch1 constant compensa- ripple vcc tion of ch1 filter ch1 amp alc inpu t of ch2 phase nf of ch2 input of ch2 compensa- tion of ch2 output2
silicore D7312CP shaoxing silicore technology co.,ltd www. silicore. com. cn chmc 2/5 absolute maximum ratings (ta=25 c) characteristic symbol value unit supply voltage vcc 14 v supply current icc 50 ma power dissipation p d 700 mw operating temperature topr -55~125 c storage temperature tstg -65~150 c electrical characteristics (unless otherwise specified: ta=25 c, vcc=6v; f=1khz ? r l =5.1k ? ) characteristics test conditions symbol test circuit min. typ. max. unit quiescent current vin=0v i cq 1 2.5 4.5 8.0 ma operating voltage vcc 1 5.0 12.0 v closed-loop voltage gain vo=0.5v gv 2 66 69 72 db total harmonic distortion vo=0.5v thd 2 0.5 1.0 % output voltage thd=1% vomax 2 1.2 1.6 v output noise voltage rg=0 ? v no 1 2.0 5.0 mv alc voltage vin=400 v v alc 3 0.55 0.63 0.7 v alc width beginning 0db to 3db w alc 3 35 47 db channel valance vo = 0 . 5 v, cb=gv1-gv2 cb 2 -1.0 0 +1.0 db
silicore D7312CP shaoxing silicore technology co.,ltd www. silicore. com. cn chmc 3/5 test circuit 1 14 2 3 4 5 6 7 8 9 10 11 12 13 10uf 5.1k 100uf/6v 18 out 10uf 5.1k 100uf/6v 18 out 10uf 220uf vcc 6v D7312CP input input test circuit 1 ? i cq ? vcc ? v no ? test circuit 2 ? gv ? thd ? vo m a x ? cb ? 1 14 2 3 4 5 6 7 8 9 10 11 12 13 10uf 5.1k 100uf/6v 18 out 10uf 5.1k 100uf/6v 18 out 10uf 220uf vcc 6v D7312CP input input 82nf 4m 22uf 82nf test circuit 3 ? v alc ? w alc ? 1 14 2 3 4 5 6 7 8 9 10 11 12 13 10uf 5.1k 100uf/6v 18 out 10uf 5.1k 100uf/6v 18 out 10uf 220uf vcc 6v D7312CP
silicore D7312CP shaoxing silicore technology co.,ltd www. silicore. com. cn chmc 4/5 application circuit 1 14 2 3 4 5 6 7 8 9 10 11 12 13 10uf rl=5k 100uf/6v 18 out 2 10uf 220uf vcc 6v D7312CP input 2 4m 22uf 0.022uf 1000pf 82nf 1.8k rec playback 10uf rl=5k 100uf/6v 18 out 1 input 1 0.022uf 1000pf 82nf 1.8k rec playback 39k 39k rec playback characteristic curves
silicore D7312CP shaoxing silicore technology co.,ltd www. silicore. com. cn chmc 5/5
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