NTE NTE745

NTE745
Integrated Circuit
Audio Amplifier, 500mW
Description:
the NTE745 is a monolithic complementary power amplifier and preamplifier designed to deliver
1/2–Watt into a loudspeaker with a 3.0mV(rms) typical input. Gain and bandwidth are externally adjustable. Typical applications include portable AM–FM radios, tape recorders, phonographs, and intercoms.
Features:
D 1/2–Watt Power Output (9.0 Vdc Supply, 8–Ohm Load)
D High Overall Gain–3.0mV(rms) Sensitivity for 1/2–Watt Output
D Low Zero–Signal Current Drain–4.0mAdc @ 9.0V typ
D Low Distortion–0.5% at 250mW typ
Electrical Characteristics: (V+ = 9V, RL = 8Ω, f = 1kHz, TA = +25°C unless otherwise specified)
Parameter
Open Loop Voltage Gain
Symbol
AVOL
Test Conditions
Min
Typ
Max
Unit
Pre–Amplifier, RL = 1.0kΩ
–
270
–
V/V
Power–Amplifier, RL = 16Ω
–
360
–
V/V
PO = 500mW
–
3.0
–
mV(rms)
–
0.5
–
W
Sensitivity
S
Output Impedance (Power–Amplifier)
ZO
Signal to Noise Ratio
S/N
PO = 150mW, f = 300Hz to 10kHz
–
55
–
dB
Total Harmonic Distortion
THD
PO = 250mW
–
0.5
–
%
Quiescent Output Voltage
VO
–
V+/2
–
Vdc
Output Power
PO
THD ≤ 10%
500
570
–
mW
Current Drain
ID
Zero Signal
–
4.0
–
mA
Power Dissipation
PD
Zero Signal
–
36
–
mW
Pin Connection Diagram
GND 1
8 Power Amp Input
N.C. 2
Power Amp Output 3
7 GND
6 Pre–Amp Input
VCC 4
5 Pre–Amp Input
8
5
.260 (6.6)
1
4
.300 (7.62)
.390 (9.9)
Max
.155
(3.93)
.100 (2.54)
.145 (3.68)
.300 (7.62)