LM387 Datasheet, PDF (1/4 Pages) National Semiconductor (TI) – LM387/LM387A Low Noise Dual Preamplifier

March 1987
LM387 LM387A Low Noise Dual Preamplifier
General Description
The LM387 is a dual preamplifier for the amplification of low
level signals in applications requiring optimum noise per-
formance Each of the two amplifiers is completely indepen-
dent with an internal power supply decoupler-regulator pro-
viding 110 dB supply rejection and 60 dB channel separa-
tion Other outstanding features include high gain (104 dB)
large output voltage swing (V_CC b 2V)p-p and wide power
bandwidth (75 kHz 20 Vp-p) The LM387A is a selected
version of the LM387 that has lower noise in a NAB tape
circuit and can operate on a larger supply voltage The
LM387 operates from a single supply across the wide range
of 9V to 30V the LM387A operates on a supply of 9V to
40V
The amplifiers are internally compensated for gains greater
than 10 The LN387 LM387A is available in an 8-lead dual-
in-line package The LM387 LM387A is biased like the
LM381 See AN-64 and AN-104
Features
Y _{Low noise}
1 0 mV total input noise
Y _{High gain}
104 dB open loop
Y _{Single supply operation}
Y _{Wide supply range LM387}
LM387A
9 to 30V
9 to 40V
Y _{Power supply rejection}
110 dB
Y _{Large output voltage swing (VCC} 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}
Y _{Performance similar to LM381}
Schematic and Connection Diagrams
Dual-In-Line Package
Typical Applications
Top View
TL H 7845 – 2
Order Number LM387N or LM387AN
See NS Package Number N08E
TL H 7845 – 1
TL H 7845 – 3
FIGURE 1 Flat Gain Circuit (A_V e 1000)
C1995 National Semiconductor Corporation TL H 7845
FIGURE 2 NAB Tape Circuit
TL H 7845 – 4
RRD-B30M115 Printed in U S A