NTE745
Integrated Circuit
Audio Amplifier, 500mW
Description:
the NTE745 is a monolithic complementary power amplifier and preamplifier designed to deliver
1/2Watt into a loudspeaker with a 3.0mV
(rms)
typical input. Gain and bandwidth are externally adjust-
able. Typical applications include portable AMFM radios, tape recorders, phonographs, and inter-
coms.
Features:
D
1/2Watt Power Output (9.0 Vdc Supply, 8Ohm Load)
D
High Overall Gain3.0mV
(rms)
Sensitivity for 1/2Watt Output
D
Low ZeroSignal Current Drain4.0mAdc @ 9.0V typ
D
Low Distortion0.5% at 250mW typ
Electrical Characteristics: (V+ = 9V, R
L
= 8
, f = 1kHz, T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Open Loop Voltage Gain
A
VOL
PreAmplifier, R
L
= 1.0k
270
V/V
PowerAmplifier, R
L
= 16
360
V/V
Sensitivity
S
P
O
= 500mW
3.0
mV
(rms)
Output Impedance (PowerAmplifier)
Z
O
0.5
W
Signal to Noise Ratio
S/N
P
O
= 150mW, f = 300Hz to 10kHz
55
dB
Total Harmonic Distortion
THD
P
O
= 250mW
0.5
%
Quiescent Output Voltage
V
O
V+/2
Vdc
Output Power
P
O
THD
10%
500
570
mW
Current Drain
I
D
Zero Signal
4.0
mA
Power Dissipation
P
D
Zero Signal
36
mW
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