FEATURES

q LOW COST

q LOW QUIESCENT CURRENT: 40

µA/channel

Shut Down: < 1

µA

q HIGH GAIN ACCURACY: G = 5, 0.07%, 2ppm/

°C

q GAIN SET WITH EXTERNAL RESISTORS

q LOW BIAS CURRENT: 10pA

q BANDWIDTH: 500kHz, G = 5V/V

q RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.02V

q WIDE TEMPERATURE RANGE:

–55

°C to +125°C

q SINGLE VERSION IN MSOP-8 PACKAGE AND

DUAL VERSION IN TSSOP-14 PACKAGE

microPower, Single-Supply, CMOS

INSTRUMENTATION AMPLIFIER

DESCRIPTION

The INA322 family is a series of low cost, rail-to-rail output,

micropower CMOS instrumentation amplifiers that offer wide-

range, single-supply, as well as bipolar-supply operation.

The INA322 family provides low-cost, low-noise amplification

of differential signals with micropower current consumption of

40

µA. When shutdown the INA322 has a quiescent current

of less than 1

µA. Returning to normal operations within

microseconds, the shutdown feature makes the INA322

optimal for low-power battery or multiplexing applications.

APPLICATIONS

q INDUSTRIAL SENSOR AMPLIFIERS:

Bridge, RTD, Thermistor, Position

q PHYSIOLOGICAL AMPLIFIERS:

ECG, EEG, EMG

q A/D CONVERTER SIGNAL CONDITIONING

q DIFFERENTIAL LINE RECEIVERS WITH GAIN

q FIELD UTILITY METERS

q PCMCIA CARDS

q COMMUNICATION SYSTEMS

q TEST EQUIPMENT

q AUTOMOTIVE INSTRUMENTATION

®

INA322

Configured internally for 5V/V gain, the INA322 offers excep-

tional flexibility with user-programmable external gain resis-

tors. The INA322 reduces common-mode error over fre-

quency and with CMRR remaining high up to 3kHz, line noise

and line harmonics are rejected.

The low-power design does not compromise on bandwidth or

slew rate, making the INA322 ideal for driving sampling Ana-

log-to-Digital (A/D) converters as well as general-purpose

applications. With high precision, low cost, and small packag-

ing, the INA322 outperforms discrete designs, while offering

reliability and performance.

A2

A1

A3

160k

Ω

REF

VIN–

VIN+

40k

Ω

40k

Ω

Shutdown

V+

VOUT

VOUT = (VIN+ – VIN–) • Gain

Gain = 5 + 5(R2/R1)

V–

R2

R1

RG

160k

Ω

INA322

INA2322

SBOS174B – DECEMBER 2000 – REVISED FEBRUARY 2006

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 2000-2006, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.