INA331

INA2331

SBOS215C – DECEMBER 2001 – REVISED APRIL 2005

DESCRIPTION

The INA331 and INA2331 are rail-to-rail output, low-power

CMOS instrumentation amplifiers that offer wide range, single-

supply operation as well as bipolar-supply operation. The

INA331 family provides low-cost, low-noise amplification of

differential signals with a low quiescent current of 415

µA

(dropping to 0.01

µA when shutdown). Returning to normal

operation within microseconds, this INA can be used for

battery or multi-channel applications.

Configured internally in a gain of 5V/V, the INA331 offers

flexibility in higher gains by choosing external resistors.

FEATURES

q DESIGNED FOR LOW COST

q HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/

°C

q GAIN SET WITH EXT. RESISTORS FOR > 5V/V

q LOW OFFSET VOLTAGE:

q HIGH CMRR: 94dB DC, 50dB at 45kHz

q LOW BIAS CURRENT: 0.5pA

q BANDWIDTH, SLEW RATE: 2.0MHz, 5V/

µs

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

q WIDE TEMPERATURE RANGE: –55

°C to +125°C

q LOW QUIESCENT CURRENT: 490

µA max/chan

q SHUT DOWN: 0.01

µA

q MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES

Copyright © 2001-2005, Texas Instruments Incorporated

Low-Power, Single-Supply, CMOS

INSTRUMENTATION AMPLIFIERS

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.

APPLICATIONS

q INDUSTRIAL SENSOR AMPLIFIERS:

Bridge, RTD, Thermocouple, 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 AUDIO AMPLIFIERS

q COMMUNICATION SYSTEMS

q TEST EQUIPMENT

q AUTOMOTIVE INSTRUMENTATION

The INA331 rejects line noise and its harmonics, because

common-mode error remains low even at higher frequencies.

High bandwidth and slew rate makes the INA331 ideal for

directly driving sampling Analog-to-Digital (A/D) converters

as well as general-purpose applications.

With high precision, low cost, and small packages, the

INA331 outperforms discrete designs. They are specified for

a wide temperature range of –55

°C to +125°C.

A2

A1

A3

40k

Ω

V

REF

V

V

10k

Ω

10k

Ω

Shutdown

V+

V

OUT

G = 5 + (5R

V–

R

2

R

1

R

G

40k

Ω

Ch A

INA2331

INA331

Ch B

®

INA2

331

INA3

31

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.

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