INA125 Datasheet, PDF (1/18 Pages) Burr-Brown (TI) – INSTRUMENTATION AMPLIFIER With Precision Voltage Reference

SBOS060
INA125
®
INA125
INA125
INSTRUMENTATION AMPLIFIER
With Precision Voltage Reference
FEATURES
q LOW QUIESCENT CURRENT: 460µA
q PRECISION VOLTAGE REFERENCE:
1.24V, 2.5V, 5V or 10V
q SLEEP MODE
q LOW OFFSET VOLTAGE: 250µV max
q LOW OFFSET DRIFT: 2µV/°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
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.
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+
SLEEP
1
2
V_REFCOM ₁₂
INA125
13
V_REFBG
14
V_REF2.5
15
V_REF5
V_REF10 16
4
10V
V_REFOut
V_I⁺_N
6
9
R_G
8
7
V_I^–_N
R
R
2R
4R
Ref
Amp
Bandgap
V_REF
A₁
30kΩ
10kΩ
10kΩ
A₂
30kΩ
3
10
V_O
11
Sense
V_O = (V_I⁺_N – V_I^–_N) G
G = 4 + 60kΩ
R_G
IA_REF
5
V–
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©1997 Burr-Brown Corporation
PDS-1361B
Printed in U.S.A., February, 1998