DUAL RECORDING/PLAYBACK PREAMPLIFIER CIRCUIT - I-TECH TECHNOLOGY
Description
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
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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-semiconductor.
com
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DUAL RECORDING/PLAYBACK PREAMPLIFIER CIRCUIT WITH ALC
APPLICATION CIRCUIT
IT7312
IT7312
I-TECH TECHNOLOGY LIMITED www.
it-semiconductor.
com
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DUAL RECORDING/PLAYBACK PREAMPLIFIER CIRCUIT WITH ALC
OUTLINE DRAWING
IT7312
I-TECH TECHNOLOGY LIMITED www.
it-semiconductor.
com
Page 4 of 4
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