INA
1
®
INA1
25
INA125
25
INSTRUMENTATION AMPLIFIER
With Precision Voltage Reference
FEATURES
q
LOW QUIESCENT CURRENT: 460
µ
A
q
PRECISION VOLTAGE REFERENCE:
1.24V, 2.5V, 5V or 10V
q
SLEEP MODE
q
LOW OFFSET VOLTAGE: 250
µ
V max
q
LOW OFFSET DRIFT: 2
µ
V/
°
C max
q
LOW INPUT BIAS CURRENT: 20nA max
q
HIGH CMR: 100dB min
q
LOW NOISE: 38nV/√ Hz at f = 1kHz
q
INPUT PROTECTION TO
±
40V
q
WIDE SUPPLY RANGE
Single Supply: 2.7V to 36V
Dual Supply:
±
1.35V to
±
18V
q
16-PIN DIP AND SO-16 SOIC PACKAGES
V
REF
COM 12
R
V
REF
BG
13
R
V
REF
2.5
14
2R
V
REF
5
15
4R
V
REF
10 16
4
10V
V
REF
Out
Ref
Amp
APPLICATIONS
q
PRESSURE AND TEMPERATURE BRIDGE
AMPLIFIERS
q
INDUSTRIAL PROCESS CONTROL
q
FACTORY AUTOMATION
q
MULTI-CHANNEL DATA ACQUISITION
q
BATTERY OPERATED SYSTEMS
q
GENERAL PURPOSE INSTRUMENTATION
V+
1
INA125
SLEEP
2
DESCRIPTION
The INA125 is a low power, high accuracy instrumen-
tation amplifier with a precision voltage reference. It
provides complete bridge excitation and precision dif-
ferential-input amplification on a single integrated
circuit.
A single external resistor sets any gain from 4 to
10,000. The INA125 is laser-trimmed for low offset
voltage (250µV), low offset drift (2µV/°C), and high
common-mode rejection (100dB at G = 100). It oper-
ates on single (+2.7V to +36V) or dual (±1.35V to
±18V)
supplies.
The voltage reference is externally adjustable with pin-
selectable voltages of 2.5V, 5V, or 10V, allowing use
with a variety of transducers. The reference voltage is
accurate to
±0.5%
(max) with
±35ppm/°C
drift (max).
Sleep mode allows shutdown and duty cycle operation
to save power.
The INA125 is available in 16-pin plastic DIP and
SO-16 surface-mount packages and is specified for
the –40°C to +85°C industrial temperature range.
Bandgap
V
REF
+
V
IN
6
9
30kΩ
R
G
10kΩ
10kΩ
+
–
V
O
= (V
IN
– V
IN
) G
8
7
–
V
IN
A
2
30kΩ
G = 4 + 60kΩ
R
G
11
Sense
A
1
10
V
O
IA
REF
5
3
V–
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©
1997 Burr-Brown Corporation
PDS-1361B
Printed in U.S.A., February, 1998
BURR-BROWN [ BURR-BROWN CORPORATION ]
