FEATURES

DESIGNED FOR LOW COST

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

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

LOW OFFSET VOLTAGE: ±250μV

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

LOW BIAS CURRENT: 0.5pA

BANDWIDTH, SLEW RATE: 2.0MHz, 5V/μs

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

WIDE TEMPERATURE RANGE: –55°C to +125°C

LOW QUIESCENT CURRENT: 490μA max/chan

SHUT DOWN: 0.01μA

MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES

APPLICATIONS

INDUSTRIAL SENSOR AMPLIFIERS:

Bridge, RTD, Thermocouple, Position

PHYSIOLOGICAL AMPLIFIERS:

ECG, EEG, EMG

A/D CONVERTER SIGNAL CONDITIONING

DIFFERENTIAL LINE RECEIVERS WITH GAIN

FIELD UTILITY METERS

PCMCIA CARDS

AUDIO AMPLIFIERS

COMMUNICATION SYSTEMS

TEST EQUIPMENT

AUTOMOTIVE INSTRUMENTATION

DESCRIPTION

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

CMOS instrumentation amplifiers that offer wide range, singlesupply

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 415μA

(dropping to 0.01μA 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.

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.