April 1991
LM363 Precision Instrumentation Amplifier
General Description
The LM363 is a monolithic true instrumentation amplifier. It
requires no external parts for fixed gains of 10, 100 and
1000. High precision is attained by on-chip trimming of off-
set voltage and gain. A super-beta bipolar input stage gives
very low input bias current and voltage noise, extremely low
offset voltage drift, and high common-mode rejection ratio.
A two-stage amplifier design yields an open loop gain of
10,000,000 and a gain bandwidth product of 30 MHz, yet
remains stable for all closed loop gains. The LM363 oper-
eliminate bandwidth loss due to cable capacitance. Com-
pensation pins allow overcompensation to reduce band-
width and output noise, or to provide greater stability with
capacitive loads. Separate output force, sense and refer-
ence pins permit gains between 10 and 10,000 to be pro-
grammed using external resistors.
On the 8-pin metal can package, gain is internally set at 10,
100 or 500 but may be increased with external resistors.
The shield driver and offset adjust pins are omitted on the
8-pin versions.
g
g
18V with only
ates with supply voltages from
1.5 mA current drain.
5V to
The LM363 is rated for 0 C to 70 C.
§
§
The LM363’s low voltage noise, low offset voltage and off-
set voltage drift make it ideal for amplifying low-level, low-
impedance transducers. At the same time, its low bias cur-
rent and high input impedance (both common-mode and
differential) provide excellent performance at high imped-
ance levels. These features, along with its ultra-high com-
mon-mode rejection, allow the LM363 to be used in the
most demanding instrumentation amplifier applications, re-
placing expensive hybrid, module or multi-chip designs. Be-
cause the LM363 is internally trimmed, precision external
resistors and their associated errors are eliminated.
Features
Y
Offset and gain pretrimmed
e
Y
Y
Y
Y
Y
Y
Y
12 nV/ Hz input noise (G 500/1000)
0
2 nA bias current typical
e
130 dB CMRR typical (G 500/1000)
No external parts required
Dual shield drivers
Can be used as a high performance op amp
Low supply current (1.5 mA typ)
The 16-pin dual-in-line package provides pin-strappable
gains of 10, 100 or 1000. Its twin differential shield drivers
Typical Connections
16-Pin Package
8-Pin Package
e
G
10 2, 3, 4, open
e
G
100 3–4 shorted
e
G
1000 2–4 shorted
TL/H/5609–33
TL/H/5609–1
Connection Diagrams
Metal Can Package
16-Pin Dual-In-Line Package
Order Number LM363H-10,
LM363H-100 or LM363H-500
See NS Package Number H08C
TL/H/5609–2
Order Number 363D
See NS Package Number D16C
C
1995 National Semiconductor Corporation
TL/H/5609
RRD-B30M115/Printed in U. S. A.
NSC [ National Semiconductor ]
