YOUDA INTEGRATED CIRCUIT
YD7312
DUAL RECORDING/PLAYBACK PREAMPLIFIER
CIRCUIT WITH ALC----YD7312
DESCRIPTION
The YD7312 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=5~12 V
*Low power on shock noise
BLICK DIAGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
RIPPLE
ALC
AMP
CH1
AMP
CH2
FILTER
WuXi YouDa Electronics Co., Ltd
Add: No.5 Xijin Road, National Hi-Tech Industrial Development Zone, Wuxi Jiangsu China
Tel: 86-510-85205117 86-510-85205106 Fax: 86-510-85205110 Website: www.e-youda.com
SHENZHEN OFFICE Tel 86-755-83740369 Fax 86-755-83741418
Ver 5. 0 1 of 3 2006-07-30
YOUDA INTEGRATED CIRCUIT
YD7312
OUTLINE FUNCTION
PIN
Name
Function
PIN
Name
Function
1 GND
GND
8 IN2
Input
2
2 T.C.
ALC
ALC Time Parameter
9
NF2
Feedback 2
3 IN
ALC
1 ALC
Input
1 10
P.
COM
Phase Compensation 2
4
OUT1
Output 1
11
OUT2
Output 2
5 P.
COM
Phase Compensation 1
12
IN
ALC
2 ALC
Input
2
6
NF1
Feedback 1
13
R.F.
Ripple Filter
7
IN1
Input 1
14
Vcc
Voltage Supply
ABSOLUTE MAXIMUM RATINGS (Tamb=25)
CHARACTERISTIC SYMBOL
VALUE
UNIT
Supply Voltage
Vcc
14 V
Supply Current
Icc
50 mA
Power Dissipation
P
D
700 mW
Operating Temperature
Topr
-55 to +125
Storage Temperature
Tstr
-65 to +150
ELECTRICAL CHARACTERISTICS
(Tamb=25, Vcc=6V, f=1kHz, unless otherwise specified)
CHARACTERISTIC SYMBOL
TEST
CONDITION MIN
TYP
MAX
UNIT
Quiescent Current
Iccq
Vin=0 2.5
4.5
8.0
mA
Operating Voltage
Vcc
5.0
12.0
V
Closed Loop Voltage Gain
Gv
Vo=0.5V
66
69
72
dB
Total Harmonic Distortion
THD
Vo=0.5V
0.5
1.0
%
Output Voltage
Vo
THD=1%
1.2
1.6
V
Output Noise Voltage
V
NO
Rg=0(internal resistance
1.5k DIN/Audio)
2.0
5.0
mV
ALC Voltage
V
ALC
Vin=400V 0.55
0.63
0.7
V
ALC Width
W
ALC
Beginning 0dB to 3dB
35
47
dB
ALC Balance
Gv Vo=0.5V -1
0
+1
dB
WuXi YouDa Electronics Co., Ltd 2 of 3 Website: www.e-youda.com
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