LM381 LM381A Low Noise Dual Preamplifier
July 1987
LM381 LM381A Low Noise Dual Preamplifier
General Description
The LM381 LM381A 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
gain (112 dB) large output voltage swing (V
CC
b
2V) p-p
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
Y
Y
Y
Y
Y
Y
Y
Y
Y
Low noise
0 5
mV
total input noise
High gain
112 dB open loop
Single supply operation
Wide supply range 9V鈥?40V
Power supply rejection
120 dB
Large output voltage swing (V
CC
b
2V)p-p
Wide bandwidth 15 MHz unity gain
Power bandwidth 75 kHz 20 Vp-p
Internally compensated
Short circuit protected
Schematic Diagram
TL H 7841 鈥?1
C
1995 National Semiconductor Corporation
TL H 7841
RRD-B30M115 Printed in U S A