UTC TA7738P LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R110-009,A
AMPLIFIER SYSTEM FOR
CASSETTE TAPE RECORDER
DESCRIPTION
The UTC 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
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
Pre AMP
Filter
Buffer
AMP
Power
AMP
ALC
Buffer
Output
Buffer NF GND
Power
Input
Power NF
Power
GND
Power
Output
Pre
Output
Pre NF
Pre
Input
Pre
GND
Filter 2
Filter 1 Vcc
Boot
Strap
ALC
Input
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
UTC TA7738P LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R110-009,A
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 kΩ
Equivalent Input Noise
Voltage
VNI Rg=0 1.4 2.5 µΩVrms
Pre-amplifier + Buffer amplifier
Closed Loop Voltage Gain GV2 Pre-AMP GV=40dB
Buff-AMP GV=20dB
60 dB
Maximum Output Voltage VOUT2 THD=3% 1.5 1.7 Vrms
Equivalent Input Noise
Voltage
VNO2 Rg=0, GV2=60dB 1.2 2.5 mVrms
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=4Ω,THD=10% 0.8 0.96 W
VCC=9V,RLΩ,THD=10% 2
Output Noise Voltage VNO3 Rg=0, GV=40dB 0.3 1 mVrms
UTC TA7738P LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R110-009,A
TEST CIRCUIT
16 15 14 13 12 11 10 9
1 2 3 4 5 6 7 8
Pre
AMP
Filter
Buffer
AMP
Power
AMP
ALC
SG
390k
Ω
47 µF
1N601N60
5.6k
Ω
10 µF
0.02
µ
F
1
2
3
1uF
1k
Ω
1k
Ω
#560pF
22k
Ω
47 µF
4.7 µF
51k
Ω
1000pF
220
Ω
#6.2k
Ω
#560pF
0.068
µ
F
1000 µF/
10V
RL
SW4
Power
Output
Buffer
Output
330
µ
F
100
µ
F
220 µF
560pF
22 µF
0.01
µ
F
47
µ
F
220
Ω
Pre
Output
SW3
10k
Ω
SW1-3
4.7 µF
3.3k
Ω
SW1
SW5 SW6
600
Ω
Inter Lock
1,2=off,
3=on
1
2
3
Rg
# use in measuring the output
noise voltage
SW2
Vcc
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
UTC TA7738P LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R110-009,A
TYPICAL PERFORMANCE CHARACTERISTICS
1
0 0.2 0.4 0.6
1 1.2
d(%)
THD vs Output Power 1
1
P0(W)
d(%)
THD vs Output Power 2
Vcc=6V
RL=40
Ω
Vcc=6V
RL=8Ω
10 100 1k
1
10
d(%)
f(Hz)
Vcc=9V
RL=9Ω
Po=1.5W
4
8
120
0
2
4
6
8
Po(W)
Vcc(V)
f=1kHz,
d=10%
RL=4Ω
Double Channel Mode Output Power
vs Supply Voltage
0.8
10
100k
10k
0.1
0.1
0.2 0.4 1.0 1.20.80.60
THD vs Output Frequency
PO(W)
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