UTC TA7738P
LINEAR INTEGRATED CIRCUIT
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
Pre
GND
Pre
Input
Pre NF
Pre
Output
Filter 2
Filter 1
Vcc
Boot
Strap
16
15
14
13
12
Filter
11
10
9
Pre AMP
Buffer
AMP
Power
AMP
ALC
1
ALC
Input
2
3
4
GND
5
6
7
8
Power
Output
Buffer
Buffer NF
Output
Power
Power
Power NF
Input
GND
ABSOLUTE MAXIMUN RATING
(Ta=25°C)
PARAMETER
SYMBOL
Supply Voltage
Output Current
Power Dissipation*
Operating Temperature
VCC
I O(peak)
PD
TOPR
VALUE
14
1.5
1200
-25~75
-55~150
UNIT
V
A
mW
°C
°C
Storage Temperature
TSTG
*Note: De-rated above Ta=25°C in proportion of 9.6mW/°C
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R110-009,A
UTC TA7738P
Total
Quiescent Current
Pre-amplifier
Open Loop Voltage Gain
Closed Loop Voltage Gain
Maximum Output Voltage
Input Impedance
Equivalent Input Noise
Voltage
Pre-amplifier + Buffer amplifier
Closed Loop Voltage Gain
Maximum Output Voltage
Equivalent Input Noise
Voltage
ALC Effect
ALC Range
Power amplifier
Open Loop Voltage Gain
Closed Loop Voltage Gain
Maximum Output Power
Output Noise Voltage
LINEAR INTEGRATED CIRCUIT
UNIT
mA
35
70
40
THD<1%
VOUT=0.5Vrms
Rg=0
0.7
30
1.4
2.5
dB
dB
Vrms
kΩ
µΩVrms
ELECTRONIC CHARACTERISTICS
(Ta=25°C, V
CC
=6V, f=1kHZ, unless otherwise specified)
PARAMETER
SYMBOL TEST CONDITIONS MIN
TYP MAX
I
CCQ1
I
CCQ2
G
VO1
G
V1
V
OUT1
R
IN1
V
NI
VCC=3.5V
VCC=6V
7.5
11
55
G
V2
V
OUT2
V
NO2
A
LC1
A
LC2
G
VO1
G
V1
P
OM
V
NO3
Pre-AMP GV=40dB
Buff-AMP GV=20dB
THD=3%
Rg=0, GV2=60dB
VIN= -60dBm~ -20dBm
THD<1%
60
RL=4Ω,THD=10%
VCC=9V,RLΩ,THD=10%
Rg=0, GV=40dB
0.8
1.5
60
1.7
1.2
2
60
70
40
0.96
2
0.3
1
2.5
dB
Vrms
mVrms
dB
dB
dB
dB
W
mVrms
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R110-009,A
UTC TA7738P
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
SW1-3
10kΩ
0.01
µF
Inter Lock
1,2=off,
3=on
220Ω
22
µF
22kΩ
4.7
µF
3.3kΩ
560pF
SW3
Pre
Output
220
µF
330
µF
100
µF
Vcc
1
SW1
2
3
16
15
14
13
12
Filter
11
10
9
Rg
Ω
600
SW5
SW6
Buffer
AMP
Power
AMP
SG
ALC
1
390k
Ω
1kΩ
2
3
#560pF
4
5
6
#6.2k
Ω
SW4
7
8
#560pF
47
µF
1000
µF/
10V
0.068
µF
Pre
AMP
220
Ω
1N60
47
µF
47
µF
Power
Output
Buffer
Output
4.7
µF
RL
5.6k
Ω
1N60
2
3
1
SW2
10
µF
1kΩ
51kΩ
1000pF
#
1uF
0.02
µF
use in measuring the output
noise voltage
SWITCH MODE
TEST ITEM
SW1
GVO1
GV1
VOUT1
GV2
VOUT2
VNO2
ALC
GVO3
GV3
PO
VNO3
1
1
1
1
1
1
1
2
2
2
2
SW2
1
1
1
3
3
3
2
1
1
1
1
SW3
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
SW5
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
SW6
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R110-009,A
UTC TA7738P
LINEAR INTEGRATED CIRCUIT
THD vs Output Power 2
1
d(%)
Vcc=6V
RL=8Ω
TYPICAL PERFORMANCE CHARACTERISTICS
THD vs Output Power 1
10
d(%)
Vcc=6V
RL=40Ω
1
0.1
0
0.2
0.4
0.6
0.8
1
PO(W)
1.2
0
0.2
0.4
0.6
0.8
1.0
1.2
P0(W)
THD vs Output Frequency
10
d(%)
8
Po(W)
Double Channel Mode Output Power
vs Supply Voltage
6
Vcc=9V
RL=9Ω
Po=1.5W
1
4
f=1kHz,
d=10%
RL=4Ω
2
0.1
10
0
100
1k
10k
f(Hz) 100k
0
4
8
12
Vcc(V)
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R110-009,A
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