NTE NTE745 Datasheet

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
able. 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

Sensitivity for 1/2–Watt Output

(rms)

D Low Zero–Signal Current Drain–4.0mAdc @ 9.0V typ
D Low Distortion–0.5% at 250mW typ

typical input. Gain and bandwidth are externally adjust-

(rms)

Electrical Characteristics

Parameter Symbol Test Conditions Min Typ Max Unit

Open Loop Voltage Gain A

Sensitivity S PO = 500mW – 3.0 – mV
Output Impedance (Power–Amplifier) Z
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 V
Output Power P
Current Drain I
Power Dissipation P

: (V+ = 9V, RL = 8Ω, f = 1kHz, TA = +25°C unless otherwise specified)

VOL

Pre–Amplifier, RL = 1.0kΩ – 270 – V/V
Power–Amplifier, RL = 16Ω – 360 – V/V

O

O

THD ≤ 10% 500 570 – mW

O

Zero Signal – 4.0 – mA

D

Zero Signal – 36 – mW

D

– 0.5 – W

– V+/2 – Vdc

(rms)

Pin Connection Diagram

GND

N.C.

Power Amp Output

V

CC

85

Power Amp Input1

8

2
3

4

GND

7

Pre–Amp Input

6
5

Pre–Amp Input

.260 (6.6)

.100 (2.54)

14

.390 (9.9)

Max

.155

(3.93)

.300 (7.62)

.300 (7.62)

.145 (3.68)