DUAL EQ AMP WITH ALC S1A2224A01 INTRODUCTION The S1A2224A01 is a monolithic integrated circuit consisting of a dual equalizer amplifier with ALC, and it is suitable for stereo radio cassette-tape players. 14−DIP−300 FEATURES • Dual equalizer amplifier with a built-in ALC circuit • Recording amp available because of high gain characteristics (Variable monitor possible) • Good channel separation (sep = 50dB Typ) • Quick stabilization after power on • Capable of direct meter driving and ALC transistor • Good ALC response balance between channels • Wide operating supply voltage range: Vcc = 4V — 13V ORDERING INFORMATION Device Package Operating Temperature S1A2224A01-D0B0 14−DIP−300 −20°C — +70°C 1 S1A2224A01 DUAL EQ AMP WITH ALC BLOCK DIAGRAM VCC OUTPUT2 COMP2 NF2 INPUT2 ALC OUT2 DECOUPLE 14 13 12 11 10 9 8 + ALC2 ALC1 + - 1 2 3 4 5 6 7 GND OUTPUT1 COMP1 NF1 INPUT1 ALC OUT1 ALC INPUT ABSOLUTE MAXIMUM RATINGS (Ta =25°°C) Characteristic Symbol Value Unit Supply Voltage VCC 14 V Power Dissipation PD 600 mW Operating Temperature TOPR −20 — +70 °C Storage Temperature TSTG −40 — +125 °C – 3.5 mA ALC TR Maximum Current 2 DUAL EQ AMP WITH ALC S1A2224A01 ELECTRICAL CHARACTERISTICS (Ta = 25°C, Vcc = 5V, RL = 10kΩ, f = 1kHz: play, RL = 680Ω: Recording) Characteristic Symbol Quiescent Circuit Current ICCQ Open Loop Voltage Gain GVO Closed Loop Voltage Gain Output Voltage Total Harmonic Distortion Test Conditions VI = 0 − Min. Typ. Max. Unit − 4.5 10 mA − 85 − dB GVC1 Play − 40 − dB GVC2 Record − 58 − dB VO THD =1%, Play 0.9 1.2 − V THD VO = 0.5V, Play − 0.1 1.0 % 21 30 − kΩ − Input Resistance RI Equivalent Input Noise Voltage VNI BW (−3dB) = 20Hz − 20kHz − 1.0 2.0 µV Cross Talk CT RG = 2.2kΩ 40 50 − dB ALC Range VALC VI = −60dBm, Record 35 45 − dB CBALC VI = −20dBm, Record − 0 2.0 dB THDALC VI = −20dBm, Record − 0.5 2.0 % ALC Balance ALC Distortion 3 S1A2224A01 4 DUAL EQ AMP WITH ALC DUAL EQ AMP WITH ALC S1A2224A01 5 S1A2224A01 DUAL EQ AMP WITH ALC TEST CIRCUIT 680Ω 10kΩ P R 56Ω R 4.7kΩ OUT2 P IN2 0.033µF 10µF 22µF 51kΩ 4.7µF 2.2kΩ Vcc 220µF 14 13 12 11 10 8 9 220µF S1A2224A01 1 2 3 4 5 51kΩ 6 7 4.7µF R 2.2kΩ 22µF IN1 4.7kΩ OUT1 P 0.033µF 10kΩ R 4.7µF 56Ω P 300kΩ 680Ω P 680Ω 4.7µF IN60 R IN60 P 680Ω 4.7µF IN60 R IN60 6 DUAL EQ AMP WITH ALC S1A2224A01 APPLICATION INFORMATION Closed Loop Voltage Gain Z R1 51K 4 C1 22µ + R2 4.7K C2 RF 56 2 C3 + 10µ 0.033µ RL SW on: play SW off: record A. Playback amplifier 1 ) Gv = 20 log Z (dB) at f =1 kHz, GV = 42 dB (Typ) Z = R1//(R2 + RF 2πf • C2 B. Recording amplifier Gv =20 log R1 (dB) at f =1 kHz, GV = 58 dB (Typ) RF 7 S1A2224A01 DUAL EQ AMP WITH ALC ALC Circuit The ALC circuit consists of TR1, TR2 and some external components. The output level of the amplifier is recti-fied by external circuits. Since this DC level is applied to the ALC input terminal (Pin 7), the impedance between the collector and emitter of TR1 can change its value. Therefore, the pre-amplifier input level can be controlled. TR2 + INPUT R1 5 TR1 INPUT 7 R4 C1 2 6 + C4 D2 R2 + RL 8 C2 D1 D3 + R3 This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.