FEATURES
LOW QUIESCENT CURRENT: 40μA/channel
Shut Down: < 1μA
HIGH GAIN ACCURACY: G = 5, 0.02%,
2ppm/°C
GAIN SET WITH EXTERNAL RESISTORS
LOW OFFSET VOLTAGE: ±200μV
HIGH CMRR: 94dB
LOW BIAS CURRENT: 10pA
BANDWIDTH: 500kHz, G = 5V/V
RAIL-TO-RAIL OUTPUT SWING: (V+) − 0.02V
WIDE TEMPERATURE RANGE:
−55°C to +125°C
SINGLE VERSION IN MSOP-8 PACKAGE AND
DUAL VERSION IN TSSOP-14 PACKAGE

APPLICATIONS
INDUSTRIAL SENSOR AMPLIFIERS:
Bridge, RTD, Thermistor, Position
PHYSIOLOGICAL AMPLIFIERS:
ECG, EEG, EMG
A/D CONVERTER SIGNAL CONDITIONING
DIFFERENTIAL LINE RECEIVERS WITH GAIN
FIELD UTILITY METERS
PCMCIA CARDS
COMMUNICATION SYSTEMS
TEST EQUIPMENT
AUTOMOTIVE INSTRUMENTATION

DESCRIPTION
The INA321 family is a series of rail-to-rail output,
micropower CMOS instrumentation amplifiers that offer
wide-range, single-supply, as well as bipolar-supply
operation. The INA321 family provides low-cost, low-noise
amplification of differential signals with micropower
current consumption of 40μA. When shutdown, the
INA321 has a quiescent current of less than 1μA.
Returning to normal operations within microseconds, the
shutdown feature makes the INA321 optimal for
low-power battery or multiplexing applications.
Configured internally for 5V/V gain, the INA321 offers
exceptional flexibility with user-programmable external
gain resistors. The INA321 reduces common-mode error
over frequency 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 INA321 ideal for driving sample
Analog-to-Digital (A/D) converters as well as
general-purpose applications. With high precision, low
cost, and small packaging, the INA321 outperforms
discrete designs, while offering reliability and
performance.