TLH7841

July 1987

LM381LM381A Low Noise Dual Preamplifier

General Description

The LM381LM381A is a dual preamplifier for the amplifica-

tion of low level signals in applications requiring optimum

noise performance Each of the two amplifiers is completely

independent with individual internal power supply decou-

pler-regulator providing 120 dB supply rejection and 60 dB

channel separation Other outstanding features include high

and wide power bandwidth (75 kHz 20 Vp-p) The LM381

LM381A operates from a single supply across the wide

range of 9V to 40V

Either differential input or single ended input configurations

may be selected The amplifier is internally compensated

with the provision for additional external compensation for

narrow band applications For additional information see

AN-64 AN-104

Features

Y

Low noise

05 mV total input noise

Y

High gain

112 dB open loop

Y

Single supply operation

Y

Wide supply range 9V – 40V

Y

Power supply rejection

120 dB

Y

Y

Wide bandwidth 15 MHz unity gain

Y

Power bandwidth 75 kHz 20 Vp-p

Y

Internally compensated

Y

Short circuit protected

Schematic Diagram

TLH7841 – 1

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A