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, V
CC
=6V, f=1kHZ, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Total
Quiescent Current
I
CCQ1
VCC=3.5V
7.5
mA
I
CCQ2
VCC=6V
11
35
Pre-amplifier
Open Loop Voltage Gain
G
VO1
55
70
dB
Closed Loop Voltage Gain
G
V1
40
dB
Maximum Output Voltage
V
OUT1
THD<1%
0.7
Vrms
Input Impedance
R
IN1
VOUT=0.5Vrms
30
k
Equivalent Input Noise
Voltage
V
NI
Rg=0
1.4
2.5
Vrms
Pre-amplifier + Buffer amplifier
Closed Loop Voltage Gain
G
V2
Pre-AMP GV=40dB
Buff-AMP GV=20dB
60
dB
Maximum Output Voltage
V
OUT2
THD=3%
1.5
1.7
Vrms
Equivalent Input Noise
Voltage
V
NO2
Rg=0, GV2=60dB
1.2
2.5
mVrms
ALC Effect
A
LC1
VIN= -60dBm~ -20dBm
2
dB
ALC Range
A
LC2
THD<1%
60
dB
Power amplifier
Open Loop Voltage Gain
G
VO1
60
70
dB
Closed Loop Voltage Gain
G
V1
40
dB
Maximum Output Power
P
OM
RL=4
,THD=10%
0.8
0.96
W
VCC=9V,RL
,THD=10%
2
Output Noise Voltage
V
NO3
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
47
F
1N60
1N60
5.6k
10
F
0.02
F
1
2
3
1uF
1k
1k
#560pF
22k
47
F
4.7
F
51k
1000pF
220
#6.2k
#560pF
0.068
F
1000
F/
10V
RL
SW4
Power
Output
Buffer
Output
330
F
100
F
220
F
560pF
22
F
0.01
F
47
F
220
Pre
Output
SW3
10k
SW1-3
4.7
F
3.3k
SW1
SW5
SW6
600
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
Vcc=6V
RL=8
10
100
1k
1
10
d(%)
f(Hz)
Vcc=9V
RL=9
Po=1.5W
4
8
12
0
0
2
4
6
8
Po(W)
Vcc(V)
f=1kHz,
d=10%
RL=4
Double Channel Mode Output Power
vs Supply Voltage
0.8
10
100k
10k
0.1
0.1
0.2
0.4
1.0
1.2
0.8
0.6
0
THD vs Output Frequency
PO(W)
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