ICs for Cassette, Cassette Deck AN78S Recording/Playback Pre-/Power Amplifier IC for V Microcassette Overview The AN78S is an integrated circuit developed for recording playback pre-/power amp., built-in VAS (Voice Activated System) function especially. Features Rec. playback pre-/power amp. IC VAS function built-in Earphone monitor at recording is possible mw BTL, OCL power amp. built-in Mic. amp built-in ALC function built-in Rec./Play switching is possible with a single circuit switch Block Diagram..±..7.±. 7 8 9. 7.±. 9.±. 9 8 7..9.±. -Lead SOP Package (SOP-P-7) GND NC / VCC VCC 9 8 7 kω Open Loop Gain 7dB db db db VAS Det. ALC R/P Cont. Power Mute db db 7 8 9 Power GND Ripple Rej. Power VCC Unit : mm includes following four Product lifecycle stage..±.
AN78S ICs for Cassette, Cassette Deck Absolute Maximum Ratings (Ta= C) Parameter Symbol Rating Unit Supply Voltage Supply Current Power Dissipation Operating Ambient Temperature V CC I CC P D T opr ~ 7 V ma mw C Storage Temperature ~ C T stg Recommended Operating Range (Ta= C) Parameter Symbol Range Operating Supply Voltage Range V CC.8V ~.V Electrical Characteristics (V CC =V, f=khz, Ta= C) Parameter Symbol Condition min. typ. max. Unit Quiescent Circuit Current <Pre-Amp.> Open Circuit Gain Total Harmonic Distortion Noise Voltage Referred to Input <Recording Amp.> Close Circuit Gain Total Harmonic Distortion Output Noise Voltage <> Closed Circuit Gain Total Harmonic Distortion Output Noise Voltage Output Offset Voltage <VAS> VAS Operation Input Voltage <ALC> Effective Voltage Effective width <Ripple Rejection> Playback System Ripple Rejection Recording System Ripple Rejection <Switching Pin> Rec./Playback Switching Pin Rec./Playback Switching Pin I tot G V V O V ni G V R V or V nr G V P O P O V O P O V n P O V DC VAS V ALC W ALC RR P RR R V PB V REC At No Input/Playback V in= 8, R g= kω V in= mvrms, R g= kω =, R g= kω R g= kω, DIN/AUDIO Filter V in= 8 V in= 8 = R g=.kω, DIN/AUDIO Filter V in= mvrms, R L= 8Ω V in= mvrms, R L= 8Ω =, R L= 8Ω R g= Ω, R L= 8Ω, DIN/AUDIO Filter R g= Ω, R L= 8Ω, Mic. input level at Piny Voltage=.V V in=, R g=.kω V in=, R g=.kω f r = 7Hz, V r = mvrms, R g= kω f r = 7Hz, V r = mvrms, R g=.kω Playback mode Recording mode. 9..8 8. 8... 7.. 7...8. 7.. 7.8 7.. 8... ma db Vrms µvrms db Vrms db mw mv µvrms V V includes following four Product lifecycle stage.
ICs for Cassette, Cassette Deck AN78S Characteristics Curve Output Voltage Vout (Vrms)..... V out, -V in VO.... VCC=V RL=kΩ freq.=khz Input Voltage Vin (mvrms).. k k 8 Frequency f (Hz) Output Voltage Vout (Vrms)... Frequency Characteristics G V, f VCC=V RL=kΩ Vout= k V out, -V in VCC=V RL=8Ω freq.=khz VO.. k Supply Voltage Characteristics V CC G V, k VO= freq.=khz RL=kΩ Input Voltage Vin (mvrms) VO max. (Vrms).....8... Output Voltage Vout (Vrms) freq.=khz RL=kΩ =... V out, -V in VCC=V freq.=khz RL=kΩ..... Input Voltage Vin (mvrms) V O max. V CC Frequency Characteristics G V, f VCC=V RL=8Ω VO=. includes following four Product lifecycle stage. k k k k k Frequency f (Hz) VO Vout.
AN78S ICs for Cassette, Cassette Deck Maximum Output Power PO max. (W)...8... 8 7 Maximum Output Power P O max. V CC = freq.=khz RL=8Ω Frequency Characteristics G V, f k k k Frequency f (Hz) 8 7 7 8 VCC=V VO= RL=kΩ Supply Voltage Characteristics G V, V CC VO=dB freq.=kω RL=kΩ Maximum Output VO max. (Vrms) Output Voltage Vout () 8.....8. Supply Voltage Characteristics G V, V CC = freq.=khz RL=kΩ VO= freq.=khz RL=8Ω V O max. V CC 8 VCC=V freq.=khz RL=kΩ ALC V out, V in Vout 8 Input Voltage Vin () includes following four Product lifecycle stage.
ICs for Cassette, Cassette Deck AN78S Application Circuit.µF.µF Mic..µF Head Pin Descriptions Pin No. 7 8 9 Pre-Amp. NF Pin.µF.7µF Rec. µf kω.kω MΩ PLAY.7µF kω µf µf µf.7µf 9 8 7 7 8 9 kω.µf.µf.7µf.µf µf.7kω.kω.µf 8Ω.µF µf VAS Speaker OFF VCC 8Ω Pin Name Pre-Amp. Output Pin Input Pin NF Pin VAS Detection MOTOR Output Pin Power Mute Pin Power Output Pin B.S. Power GND Power V CC Power Output -pin PAUSE Pin No. 7 8 9 B.S. V CC 7µF Filter Pin Center AN78S Pin Name to Motor Rec./Play Switching Pin ALC Detection NC Output Pin Mic. Amp. NF Pin Mic. Amp. Input Pin Pre. GND Input Pin includes following four Product lifecycle stage. µf VCC
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