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TA7738P LINEAR INTEGRATED CIRCUIT
AMPLIFIER SYSTEM FOR
CASSETTE TAPE RECORDER
DESCRIPTION
The Contek TA7738P is an amplifier system, designed for a
stereo set and a radio cassette tape recorder.
FEATURES
*Recorder play balk for pre-amplifier
*Buffer amplifier( recorder amplifier)
*Power amplifier
*Wide operating voltage range( 3.5V to 9V)
DIP-16
BLOCK DIAGRAM
Pre
Pre
GND
16 15 14 13 12 11 10 9
ALC
1 2 3 4 5 6 7 8
ALC
Input
Input
Pre AMP
Buffer
Output
Pre NF
Buffer NF GND
Pre
Output
Buffer
AMP
Filter 2
Power
Input
Filter 1 Vcc
Filter
Power NF
Power
AMP
Power
GND
Boot
Strap
Power
Output
ABSOLUTE MAXIMUN RATING(Ta=25 C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage VCC 14 V
Output Current I O(peak) 1.5 A
Power Dissipation* PD 1200 mW
Operating Temperature TOPR -25~75 C
Storage Temperature TSTG -55~150 C
*Note: De-rated above Ta=25 C in proportion of 9.6mW/ C
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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TA7738P LINEAR INTEGRATED CIRCUIT
ELECTRONIC CHARACTERISTICS(Ta=25 C, VCC=6V, f=1kHZ, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Total
Quiescent Current ICCQ1 VCC=3.5V 7.5 mA
ICCQ2 VCC=6V 11 35
Pre-amplifier
Open Loop Voltage Gain GVO1 55 70 dB
Closed Loop Voltage Gain GV1 40 dB
Maximum Output Voltage VOUT1 THD<1% 0.7 Vrms
Input Impedance RIN1 VOUT=0.5Vrms 30 kW
Equivalent Input Noise
Voltage
Pre-amplifier + Buffer amplifier
Closed Loop Voltage Gain GV2 Pre-AMP GV=40dB
Maximum Output Voltage VOUT2 THD=3% 1.5 1.7 Vrms
Equivalent Input Noise
Voltage
ALC Effect ALC1 VIN= -60dBm~ -20dBm 2 dB
ALC Range ALC2 THD<1% 60 dB
Power amplifier
Open Loop Voltage Gain GVO1 60 70 dB
Closed Loop Voltage Gain GV1 40 dB
Maximum Output Power POM RL=4W ,THD=10% 0.8 0.96 W
Output Noise Voltage VNO3 Rg=0, GV=40dB 0.3 1 mVrms
VNI Rg=0 1.4 2.5 mWVrms
60 dB
Buff-AMP GV=20dB
VNO2 Rg=0, GV2=60dB 1.2 2.5 mVrms
VCC=9V,RL W,THD=10% 2
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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TA7738P LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
Pre
Output
SW3
0.01 mF
330 mF
Filter
Buffer
AMP
4.7 mF
51kW 1000pF
100 mF
Power
AMP
#560pF
#6.2kW
220W
SW4
# use in measuring the output
noise voltage
220mF
0.068
Vcc
47 mF
1000 mF/
10V
Power
mF
Output
RL
Rg
600W
SW1
SG
4.7 mF
3.3kW
1
2
3
SW5 SW6
SW1-3
Inter Lock
10kW
1,2=off,
3=on
22mF
220W
22kW
560pF
16 15 14 13 12 11 10 9
Pre
AMP
ALC
1 2 3 4 5 6 7 8
#560pF
1N60
1N60
5.6kW
1kW
47 mF
Buffer
Output
3
2
SW2
1
1uF
10 mF
1kW
0.02 mF
390kW
47 mF
SWITCH MODE
TEST ITEM SW1 SW2 SW3 SW4 SW5 SW6
GVO1 1 1 ON OFF OFF OFF
GV1 1 1 OFF OFF OFF OFF
VOUT1 1 1 OFF OFF OFF OFF
GV2 1 3 OFF OFF OFF OFF
VOUT2 1 3 OFF OFF OFF OFF
VNO2 1 3 OFF OFF ON OFF
ALC 1 2 OFF OFF OFF OFF
GVO3 2 1 OFF ON OFF OFF
GV3 2 1 OFF OFF OFF OFF
PO 2 1 OFF OFF OFF OFF
VNO3 2 1 OFF OFF OFF ON
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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TA7738P LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
d(%)
THDvs OutputPower 1
10
Vcc=6V
RL=40
W
1
1
d(%)
0.1
THDvs OutputPower 2
Vcc=6V
RL=8W
0 0.2 0.4 0.6
THDvs OutputFrequency
10
d(%)
Vcc=9V
RL=9W
Po=1.5W
1
0.1
10 100 1k
0.8
10k
1 1.2
PO(W)
100k
f(Hz)
Po(W)
0.2 0.4 1.0 1.20.80.60
DoubleChannelModeOutputPower
vs SupplyVoltage
8
6
f=1kHz,
4
2
0
d=10%
RL=4W
4
8
P0(W)
120
Vcc(V)
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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