LM381.pdf

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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 Low noise Ð 0.5 m V total input noise
Y High gain Ð 112 dB open loop
Y Single supply operation
Y Wide supply range 9V±40V
Y Power supply rejection Ð 120 dB
Y Large output voltage swing (V CC b 2V)p-p
Y Wide bandwidth 15 MHz unity gain
Y Power bandwidth 75 kHz, 20 Vp-p
Y Internally compensated
Y Short circuit protected
Schematic Diagram
TL/H/7841±1
C 1995 National Semiconductor Corporation
TL/H/7841
RRD-B30M115/Printed in U. S. A.
385377991.003.png
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
Operating Temperature Range
0 § Cto a 70 § C
Storage Temperature Range
b 65 § Cto a 150 § C
a 40V
Lead Temperature (Soldering, 10 sec.)
260 § C
Power Dissipation (Note 1)
1.56 W
Electrical Characteristics T A e 25 § C, V CC e 14V, unless otherwise stated.
Parameter
Conditions
Min
Typ
Max
Units
Voltage Gain
Open Loop (Differential Input), f e 100 Hz
160,000
V/V
Open Loop (Single Ended), f e 100 Hz
320,000
V/V
Supply Current
V CC 9V to 40V, R L e %
10
mA
Input Resistance
(Positive Input)
100
k X
(Negative Input)
200
k X
Input Current
(Negative Input)
0.5
m A
Output Resistance
Open Loop
150
X
Output Current
Source
8
mA
Sink
2
mA
Output Voltage Swing
Peak-to-Peak
V CC b 2
V
Unity Gain Bandwidth
15
MHz
Power Bandwidth
20 V PP (V CC e 24V)
75
kHz
Maximum Input Voltage
Linear Operation
300 mVrms
Supply Rejection Ratio
f e 1 kHz
120
dB
Channel Separation
f e 1 kHz
60
dB
Total Harmonic Distortion
60 dB Gain, f e 1 kHz
0.1
%
Total Equivalent Input R S e 60 X , 10±10,000 Hz (Single Ended
Noise Input, Flat Gain Circuit, A V e 1000)
LM381A 0.5 0.7 m Vrms
LM381 0.5 1.0 m Vrms
Note 1: For operation in ambient temperatures above 25 § C, the device must be derated based on a 150 § C maximum junction temperature and a thermal resistance
of 80 § C/W junction to ambient.
Connection Diagram
Dual-In-Line Package
TL/H/7841±2
Top View
Order Number LM381N or LM381AN
See NS Package Number N14A
2
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Typical Applications
Typical Tape Playback Amplifier
Typical Magnetic Phono Preamp
TL/H/7841±3
Two-Pole Fast Turn-On NAB Tape Preamp
TL/H/7841±4
Audio Mixer
TL/H/7841±5
TL/H/7841±6
Ultra-Low Distortion Amplifier
(A V e 10, THD k 0.05%, V OUT e 3V RMS )
TL/H/7841±7
3
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Typical Performance Characteristics
Large Signal Frequency
P-P Output Voltage
Response
V CC vs I CC
V CC Swing vs
% Distortion
Channel Separation
PSRR vs Frequency
Gain and Phase Response
Noise Voltage vs Frequency
Noise Current vs Frequency
Pulse Response
TL/H/7841±8
4
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