PB/REC PRE AMP FOR 2 DECK S1A0291X01 INTRODUTION The S1A0291X01 is a monolithic integrated circuit consisting of a dual input playback amplifier and a dual input record amplifier for double-deck or auto-reverse operation. It is suitable for 6V — 9V double-deck or auto-reverse cassette applications. 24−SDIP−300 FEATURES • Dual input two-channel playback amplifier • Two-channel record amplifier • Built-in ALC and Muting circuit • PB/REC and playback input select switch included • Power ON ALC discharge circuit included • Operating supply voltage: Vcc = 4V — 12V • REC/PB power on quick start circuit • Few external part required ORDERING INFORMATION Device Package Operating Temperature S1A0291X01-A0B0 24−SDlP−300 −25°C — +75°C 1 S1A0291X01 PB/REC PRE AMP FOR 2 DECK BLOCK DIAGRAM PB OUT(2) 24 21 A-IN B-IN 100K 22 REC MUTE MUTE IN(2) ALC OUT(2) R/P SW SW 8 19 20 PRE INPUT 9 INPUT PRE N.F A-IN 1 B-IN PB OUT(1) 100K 2 PB NF(1) 15 100K N.F PRE MODE CONTROL /BIAS CIRCUIT PLAYBACK PB.BIAS I.REF VCC 17 REC GND REC.BIAS 18 3 4 PBiN(1) INPUT 14 REC NF(2) 13 REC IN(2) 12 REC IN(1) 11 REC NF(1) ALC DET A/B SELECT SW RECORE I.REF VCC 16 ALC TIME CONSTANT 23 PB iN(2) R/P SW PB NF(2) PRE INPUT N.F 100K 5 7 6 A/B SW PB GND MUTE IN(1) 10 REC OUT(1) ABSOLUTE MAXIMUM RATINGS ( Ta = 25°C) Characteristic Symbol Value Unit Supply Voltage VCC 12 V Power Dissipation PD 1000 mW Operating Temperature TOPR −25 — +75 °C Storage Temperature TSTG −55 — + 125 °C 2 PB/REC PRE AMP FOR 2 DECK S1A0291X01 ELECTRICAL CHARACTERISTICS (Ta = 25°C, VCC = 9V, f = 1kHz, unless otherwise specified) Characteristic PLAYBACK Circuit Current Test Conditions Min. Typ. Max. Unit ICCQ VI = 0, REC MODE 10 18 26 mA Open Loop Voltage Gain GVO VI = −80dBm 60 90 − dB Output Voltage VO1 THD = 1%, NAB 0.75 1.2 − V THD1 VO = 0.2V, NAB − 0.05 0.3 % CH to CH CT1 VO = 0.5V, NAB − −55 − 45 dB Ain to Bin CT2 VO = 0.5V, NAB − −55 − 45 dB Equivalent Input Noise Voltage VNI Fiter: 20Hz − 20kHz RG = 2.2kΩ, VI = 0 − 1.2 2.2 µV Close Loop Voltage Gain GVC VI = 68dBm, ALC off 58 60 62 dB Output Voltage VO2 THD = 1%, ALC off 1.2 1.6 − V THD2 VI = 0dBm, ALC off − 0.2 1 % Total Harmonic Distortion Cross Talk Total Harmonic Distortion RECORD Symbol ALC Output Voltage VO(ALC) VI = −20dBm 0.75 0.95 1.35 V ALC THD THDALC VI = −20dBm − 0.2 1.0 % VI = −60dBm, +3dB UP 40 50 − dB CT3 VI = −50dBm − −55 −40 dB Record TO Playback Cross Talk CT4 REC input = GND PLAY output = 0.5V − −60 −40 dB Muting Range MR VI = −20dBm − −55 −40 dB ALC Range RALC (ALCR) Cross Talk (ALC) 3 S1A0291X01 PB/REC PRE AMP FOR 2 DECK TEST CIRCUIT PB OUT PB B-IN PB A-IN MUTE OUT MUTE IN REC OUT Vcc = 9V REC IN 150Ω 10kΩ OPEN = CLOSE LOOP SHORT = OPEN LOOP SW4-1 10k Ω 10kΩ 100 Ω 2.2k Ω 10 µ F 1MΩ 22µF SW3 2.2kΩ 10µF 47µF 2.2kΩ 10µ F 0.027µF 6.2kΩ 10kΩ 10 µ F 47µ F SHORT= MUTE NO 24 23 22 21 20 19 18 17 16 15 14 13 9 10 11 12 S1A0291X01 2 3 4 2.2kΩ 5 6 7 = A-IN = B-IN SW1 PB OUT 10 µ F 10k Ω 150Ω PB B-IN PB A-IN MUTE IN MUTE OUT NOTE: These specifications are subject to change without notice. 4 47µ F 10 µ F 10kΩ OPEN = CLOSE LOOP SHORT = OPEN LOOP = PLAY = REC SW2 10µ F 10kΩ SW4-2 8 GND SHORT 47µF 6.2kΩ 10µ F 0.027µF GND SHORT 2.2kΩ 1 100 Ω REC OUT 2.2k Ω REC IN PB/REC PRE AMP FOR 2 DECK S1A0291X01 APPLICATION INFORMATION 1. R/P SWITCH Apply R/P input voltage at PIN 8. PLAY: 0V (GND) REC: 4.5V − 12V (Do not apply above 13V). Only valid A/B input select in playback mode. In record mode, the playback A-input is available and the ALC is turned on by record bias. A. Record Mode Schematic P VCC R R/P SW A/B SELECT SW 8 5 CONTROL CONTROL REC BIAS ON A/B SELECT DISABLE A-INPUT AVAILABLE PLAYBACK BIAS A-INPUT BIAS B-INPUT BIAS 5 S1A0291X01 PB/REC PRE AMP FOR 2 DECK B. Playback Mode Schematic VCC P R A/B SELECT SW R/P SW 8 5 CONTROL CONTROL A/B SELECT VALID REC BIAS OFF A-INPUT BIAS PLAYBACK BIAS B-INPUT BIAS NOTE: These specification are object to change without notice. 2. PLAYBACK A/B INPUT SELECT SWITCH(only playback mode) VCC B A A/B SELECT SW 5 CONTROL PLAY BACK BIAS A-INPUT BIAS B-INPUT BIAS 6 PB/REC PRE AMP FOR 2 DECK S1A0291X01 3. MUTE SWITCH VCC SHORT=MUTE ON 10K 20 19 6 NOTES: 1. THIS CIRCUIT IS OPERATED ON REVERSE SATURATION MODE 2. These specifications are subject to change without notice. 7 R L R L PB DECK R/P DECK ERASE HEAD . Q6 C1008 85K 85K Q1 C1008 R12 2.2kΩ R13 2.2kΩ Q2 C1008 C18 470pF R33 2.2kΩ Q4 C1008 R35 2.2kΩ 220pF D2 1N4148 C34 R32 2.2kΩ R34 2.2kΩ C4 470pF R11 10kΩ C2 100pF R2 2.2kΩ R14 2.2kΩ C17 100pF R26 10kΩ 220pF R3 5.6kΩ 3 1µF/50V R4 82Ω 4 R31 220Ω 10kΩ VR1 18 17 1kΩ R1 2.2kΩ 5 R5 4.7kΩ 6 R38 10kΩ 7 8 R30 33Ω Q7 C1008 S1A0291X01 19 R16 10kΩ 20 R15 2.2kΩ D6 1N4148 21 C3 100pF 22 C11 47µF/10V 2 23 100pF C1 C5 0.022µF 1 24 100pF C19 C22 R18 47µF/10V 5.6kΩ C20 100pF 1kΩ 1µF/50V R17 82Ω R26 C32 VR1 47kΩ C19 0.022µF VR2 47kΩ C33 1000pF BIAS OSC C37 0.015pF C38 0.022µF R23 10kΩ 10 15 12 11 100pF 13 C8 IN4148 R9 47kΩ R67 47kΩ C15 1µF/50V D5 IN4148 C27 1µF/50V R24 2.7kΩ 14 100pF C28 R28 100Ω R27 47§Ú C39 0.022µF C9 R7 R8 0.018µF 100Ω 2.7kΩ R6 10kΩ 9 16 C23 47µF/10V R20 C40 100µF/10V C24 100µF/10V 560kΩ R21 Q3 C1008 C29 100pF 100Ω R22 C7 0.022µF C30 0.018µF Q5 C1008 C25 100Ω 1µF/50V C13 1µF/50V C30 100µF/10V C14 100µF/10V C31 1000pF R59 10kΩ R68 22kΩ Q12 C945 R44 2.2kΩ R42 2.2kΩ Q11 C945 Q19 C945 R39 10kΩ C43 0.01µF R45 3.3kΩ Q14 C945 R46 2.2kΩ R48 2.2kΩ Q13 C945 R43 3.3kΩ C41 0.01µF R66 2.2kΩ 2.2kΩ R62 C45 1µF/50V C47 1µF/50V C23 1µF/50V D7 1N4148 D10 1N4148 R41 2.2kΩ C44 1µF/50V Q17 C945 R60 22kΩ R55 39kΩ D9 1N4148 HI - SPEED D11 1N4148 Q10 A733 Q9 C945 R70 2.2kΩ R37 4.7kΩ R72 220kΩ 100kΩ R43 10kΩ Q15 A733 Q8 A733 C21 1000pF C49 1000pF R65 33kΩ R57 4.7kΩ Q16 A733 VR3 5kΩ 4.7kΩ R61 D8 1N4148 Q18 C1008 R51 2.2kΩ C42 33kΩ R71 1kΩ R69 1kΩ R49 R56 10Ω 220kΩ R50 220kΩ POWER SW 100µF/16V R64 3.3kΩ R54 D3 1N4148 D4 1N4148 R GND L L GND R VCC GND M-B M-B B A REC B - PLAY A - PLAY R/P PB REC IN OUT PUT 8 C10 0.022µF S1A0291X01 PB/REC PRE AMP FOR 2 DECK APPLICATION CIRCUIT