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DUAL CHANNEL PRE-AMP. WITH ALC D7312CP
DESCRIPTION
The D7312CP is a monolithic integrated
circuit designed for dual pre-amplifier circuit
with ALC for record /playback amplifier of
cassette tape recorder.
Outline Drawing
F E AT U R E
z High open loop gain
z Incorporates ALC detector circuit
z No input coupling condenser
z Low noise and current consumption
z Wide ALC range
z Wide operating voltage range: Vcc=5V ~ 12V
Low Power ON shock noise DIP-14
BLOCK DIAGRAM AND PIN CONNECTION
Vcc
14 13 12 11
Ripple Filter
Input of ch2
10 9 8
Ch2
Amp
ALC
12
GND
34
Ch1
Amp
5 67
Input of ch1
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D7312CP
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
Characteristic
Supply Voltage
Supply Current
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
Vcc
Icc
PD
Topr
Tstg
Va l u e
14
50
700
-55~125
-65~150
Unit
V
mA
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(unless otherwise specified: Ta=25°C, Vcc=6V; f=1kHz RL=5.1k)
Characteristics
Quiescent Current
Test
conditions
Vin=0V
Symbol
Test
Circuit
Min.
Typ.
Max. Unit
ICQ 1 2.5 4.5 8.0 mA
Operating Vo ltage
Vcc 1 5.0
12.0 V
Closed-loop Vo ltage Gain Vo =0.5V
Gv 2 66 69 72 dB
Total Harmonic Distortion Vo =0.5V
THD
2
0.5 1.0 %
Output Voltage
THD=1%
Vo max 2
1.2 1.6
V
Output noise Vo ltage
Rg=0
VNO
1
2.0 5.0 mV
ALC Vo ltage
ALC Width
Channel Valance
Vin=400µV
Beginning
0dB to 3dB
Vo=0.5 V,
CB=Gv1-Gv2
VALC
WALC
CB
3 0.55 0.63 0.7 V
3 35 47
dB
2 -1.0 0 +1.0 dB
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TEST CIRCUIT
D7312CP
5.1K 18
Vcc OUT
6V 10uF
14 13 12 11 10 9 8
D7312CP
123 45 6 7
10uF
OUT
5.1K
18
5.1K 18
Vcc OUT
6V
10uF
INPUT
14 13 12 11 10 9 8
D7312CP
123 45 6 7
10uF
INPUT
OUT
5.1K
18
Test circuit 1 ICQ Vcc VNO
Test circuit 2 Gv T HD Vo ma x C B
5.1K 18
Vcc OUT
6V
INPUT
14 13 12 11 10 9 8
D7312CP
123 45 6 7
10uF
INPUT
4M
OUT 5.1K 18
Test circuit 3 VALC WALC
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APPLICATION CIRCUIT
REC 18
RL=5K
82nF
Vcc OUT 2
6V
39K
14 13 12 11 10 9 8
D7312CP
1234 5 6 7
10uF
39K
OUT 1
82nF
REC REC 18
CHARACTERISTIC CURVES
D7312CP
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D7312CP
SHAOXING SILICORE TECHNOLOGY CO.,LTD
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