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NTE7155
Integrated Circuit
Dual Low–Voltage Power Amplifier
Description:
The NTE7155 is a monolithic integrated circuit in an 8–Lead DIP type package designed for use as
a dual audio power amplifier in portable cassette players and radios.
Features:
D Supply Voltage Down To 1.8V
D Low Crossover Distortion
D Low Quiescent Current
D Bridge or Stereo Configuration
Absolute Maximum Ratings:
Supply Voltage, VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Peak Output Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Total Power Dissipation, PD
TA = +50°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0W
TC = +50°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4W
Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C
Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100°C/W
Thermal Resistance, Junction–to–Case (Pin4), RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
Electrical Charactgeristics: (VS = 6V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Stereo
Supply Voltage
Quiescent Output Voltage
Quiescent Drain Current
Input Bias Current
VS
VO
VS = 3V
ID
IB
1.8 – 15 V
– 2.7 –
V
– 1.2 –
V
– 6 9 mA
– 100 – nA

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Electrical Charactgeristics (Contd): (VS = 6V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max
Stereo (Contd)
Output Power (Each Channel)
(f = 1kHz, d = 10%)
Distortion (f = 1kHz)
Closed Loop Voltage Gain
Channel Balance
Input Resistance
Total Input Noise
PO RL = 32VS = 9V
300
VS = 6V
90 120
VS = 4.5V
60
VS = 3V
15 20
VS = 2V
5
RL = 16VS = 6V
170 220
RL = 8
VS = 9V
1000
VS = 6V
300 380
RL = 4
VS = 6V
450 650
VS = 4.5V
320
VS = 3V
110
d RL = 32, PO = 40mW
0.2
RL = 16, PO = 75mW
0.2
RL = 8, PO = 150mW
0.2
GV f = 1kHz
36 39 41
GV – – ±1
RI f = 1kHz
100
eN RS = 10kB = Curve A
2.0
B = 22Hz to 22kHz 2.5
Supply Voltage Rejection
SVR f = 100Hz, C1 = C2 = 100µF
24 30
Channel Separation
Bridge
CS f = 1kHz
50
Supply Voltage
Quiescent Drain Current
Output Offset Voltage (Between Outputs)
Input Bias Current
Output Power (f = 1kHz, d = 10%)
VS
ID RL =
VOS RL = 8
IB
PO RL = 32
RL = 16
RL = 8
RL = 4
VS = 9V
VS = 6V
VS = 4.5V
VS = 3V
VS = 2V
VS = 9V
VS = 6V
VS = 3V
VS = 6V
VS = 4.5V
VS = 3V
VS = 4.5V
VS = 3V
VS = 2V
1.8 15
69
– – ±50
100
1000
320 400
200
50 65
8
2000
800
120
900 1350
700
220
1000
200 350
80
Unit
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW
%
%
%
dB
dB
k
µV
µV
dB
dB
V
mA
mV
nA
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW
mW

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Electrical Charactgeristics (Contd): (VS = 6V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max
Bridge (Contd)
Distortion
Closed Loop Voltage Gain
Input Resistance
Total Input Noise
d RL = 8, PO = 0.5W, f = 1kHz
0.2
GV f = 1kHz
39
RI f = 1kHz
100
eN RS = 10kB = Curve A
2.5
B = 22Hz to 22kHz 3.0
Supply Voltage Rejection
SVR f = 100Hz
40
Power bandwidth (3dB)
B RL = 8, PO = 1W
120
Unit
%
dB
k
µV
µV
dB
kHz
Pin Connection Diagram
Output 1 1
Supply Voltage 2
Output 2 3
GND 4
8 () Input 1
7 (+) Input 1
6 (+) Input 2
5 () Input 2
85
.260 (6.6) Max
14
.430 (10.92)
Max
.200
(5.08)
.300 (7.62)
.100 (2.54)
.300 (7.62)
.125 (3.18) Min