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.