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UTC7312 S w w aDUAL RECORDING/PLAYBACK D PRE-AMPLIFIER CIRCUIT WITH . ALC w DESCRIPTION The UTC7312 is a monolithic integrated circuit designed for dual pre-amplifier circuit with ALC for record /playback amplifier of cassette tape recorder. ta ee h 4U t om .c LI NEAR I NTEGRATED CI RCUI T 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 Rippli filter ALC input Ch 2 Vcc 14 Ripple Filter Phase compensat ion of ch1 ALC Time constant NFof CH1 ALC input Ch 1 Output 1 Input of Ch1 w w w t a .D 13 ALC 2 12 S a 11 4 e h Phase compensat ion of ch2 U t4 e NFof CH2 .c m o DIP-14 Output 2 10 9 Ch2 Amp Ch1 Amp 1 GND 3 5 6 Input of Ch2 8 7 YOUW ANG ELECTRONI CO. CS LTD w w w .D a aS t ee h 1 4U t om .c UTC7312 Characteristic Supply Voltage Supply Current Power Dissipation Operating Temperature Storage Temperature LI NEAR I NTEGRATED CI RCUI T Symbol Vcc Icc PD Topr Tstr ABSOLUTE MAXIMUM RATINGS(Ta=25C ) Value 14 50 700 -55 to 125 -65 to 150 Unit V mA mW C C ELECTRICAL CHARACTERISTICS ( Ta=25C ,Vcc=6V,f=1kHz,,RL=5.1k,unless otherwise specified) Characteristic Quiescent current Operating voltage Closed-llop Voltage Gain Total Harmonic Distortion Output Voltage Output noise Voltage ALC Voltage ALC Width Channel Balance Symbol ICCQ Vcc Gvc THD Vo Vno VALC WALC CB Test Condition Vi=0 Vo=0.5V Vo=0.5V THD=1% Rg=0(internal resistance 1.5k) DIN/Audio) Vin=400V Beginning 0dB to 3dB Vo=0.5V,CB=Gv1-Gv2 Min 2.5 5.0 66 1.2 Typ. 4.5 69 0.5 1.6 2.0 0.63 47 0 Max 8.0 12.0 72 1.0 5.0 0.7 +1 Unit mA V dB % V mV V dB dB 0.55 35 -1 TYPICAL APPLICATION CIRCUIT REC RL=5k Playback 1.8k Output of CH2 220F 100F 1000pF 82nF input2 Vcc=6V 0.022F 10F 10F 39k 14 13 12 11 10 9 8 UTC7312 1 2 3 Playback 4 0.022F 10F 5 39k 6 7 100F 22F 4M 82nF REC 1.8k RL=5k Output of CH1 Playback REC YOUW ANG ELECTRONI CO. CS LTD 1000pF Input1 2 UTC7312 Vomax,Gv vs. Supply Voltage 5 10 LI NEAR I NTEGRATED CI RCUI T ICCQ THD vs. Supply Voltage 80 TYPICAL PERFORMANCE CHARACTERISTICS Gv, THD vs. Frequency Maximum Output Voltage (V) Total Harmonic Distortion (%) Quiescent current (mA) 4 8 70 3 71 Voltage Gain (dB) 6 Voltage Gain (dB) ICCQ GV Vcc=6V Vo=0.5V RL=5.1k FLAT THD 60 Gv 2 70 4 2 50 2 1 69 2 1 THD 0 0 3 6 9 12 15 40 1 0 0 3 6 9 12 15 68 0 30 10 100 1k 10k 100k 0 Supply Voltage (V) Supply Voltage (V) Frequency (Hz) Gv, THD vs. Frequency 80 100 Vo, THD vs. Input Voltage 100 Vo, THD vs. Input Voltage Vcc=6V f=1kHz RL=5.1k FLAT the dot line is measured at Vcc=12V Total Harmonic Distortion (%) Total Harmonic Distortion (%) 70 Voltage Gain (dB) Output Voltage (V) 60 GV 50 2 1 Vo Output Voltage (V) 10 10 10 10 1 1 1 THD Vo 0.1 0.1 40 1 0.1 0.1 THD 0.01 0.01 0.1 1 10 THD 30 10 100 1k 10k 100k 0 0.01 0.01 0.1 1 10 Frequency (Hz) Input Voltage (mV) Input Voltage (mV) Gvo vs. Frequency 10 VALC THDvs. Input Voltgae Open Circuit Volatge Gain (dB) 120 100 ALC Voltage (dBV) Pin 6.9 100F 5 Vcc=6V f=1kHz 0 80 -5 1.5 -10 1.0 0.5 60 40 10 100 1k 10k 100k -15 -80 -60 -40 -20 0 0 Frequency (Hz) Input Voltage (mV) YOUW ANG ELECTRONI CO. CS LTD Total Harmonics Distortion (%) Vcc=6V Vo=1V Total Harmonic Distortion (%) Vcc=6V Vo=0.5V RL=5.1k NAB Total Harmonic Distortion (%) f=1kHz Vcc=0.5V RL=5.1k THD=1% Vomax 3 |
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