IT7312

DUAL RECORDING/PLAYBACK PREAMPLIFIER CIRCUIT WITH ALC IT7312 DESCRIPTION The IT7312 is a monolithic integrated circuit designed for dual pre-amplifier circuit with ALC for recording/playback amplifier of cassette tape recorder. FEATURES *High open loop gain *Incorporates ALC detector circuit *No input coupling condenser *Low noise and current consumption *Wide ALC range *Wide operating voltage range: Vcc=5V~12V *Low power on shock noise BLOCK DIAGRAM 14 13 12 11 10 9 RIPPLE FILTER AMP CH1 ALC AMP CH2 1 234 56 8 7 I-TECH TECHNOLOGY LIMITED www.it-semiconductor.com Page 1 of 4 DUAL RECORDING/PLAYBACK PREAMPLIFIER CIRCUIT WITH ALC IT7312 ABSOLUTE MAXIMUM RATINGS (Tamb=25 ) CHARACTERISTIC Supply Voltage Supply Current Power Dissipation Operating Temperature Storage Temperature SYMBOL Vcc Icc PD Topr Tstr VALUE 14 50 700 -55 to +125 -65 to +150 UNIT V mA mW ELECTRICAL CHARACTERISTICS (Tamb=25 , Vcc=6V, f=1KHz, unless otherwise specified) CHARACTERISTIC SYMBOL TEST CONDITION Quiescent Current Iccq Vin=0 Operating Voltage Vcc Closed Loop Voltage Gain Gv Vo=0.5V Total Harmonic Distortion THD Vo=0.5V Output Voltage Output Noise Voltage ALC Voltage Vo VNO VALC THD=1% Rg=0(internal resistance 1.5k DIN/Audio) Vin=400 V ALC Width WALC Beginning 0dB to 3dB ALC Balance Gv Vo=0.5V MIN TYP MAX UNIT 2.5 4.5 8.0 mA 5.0 12.0 V 66 69 72 dB 0.5 1.0 % 1.2 1.6 V 2.0 5.0 mV 0.55 0.63 0.7 V 35 47 dB -1 0 +1 dB I-TECH TECHNOLOGY LIMITED www.it-semi...