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INA322
  • INA322

INA322

ACTIVE

Micropower (40-µA) plus shutdown, 2-mV offset, 10-pA bias, RRO instrumentation amp

Texas Instruments INA322 Product Info

1 April 2026 1

Parameters

Number of channels

1

Vs (max) (V)

5.5

Vs (min) (V)

2.5

Input offset (±) (max) (µV)

10000

Voltage gain (min) (V/V)

5

Voltage gain (max) (V/V)

1000

Noise at 1 kHz (typ) (nV√Hz)

100

Features

Cost Optimized

CMRR (min) (dB)

60

Input bias current (±) (max) (nA)

0.01

Iq (typ) (mA)

0.04

Bandwidth at min gain (typ) (MHz)

0.5

Gain error (±) (max) (%)

0.4

Operating temperature range (°C)

-55 to 125

Rating

Catalog

Type

Resistor

Gain nonlinearity (±) (max) (%)

0.01

Output swing headroom (to negative supply) (typ) (V)

0.025

Output swing headroom (to positive supply) (typ) (V)

-0.025

Input common mode headroom (to negative supply) (typ) (V)

0.55

Input common mode headroom (to positive supply) (typ) (V)

-1.7

Noise at 0.1 Hz to 10 Hz (typ) (µVPP)

20

Package

VSSOP (DGK)-8-14.7 mm² 3 x 4.9

Features

  • LOW COST
  • LOW QUIESCENT CURRENT: 40µA/channel
    Shut Down: < 1µA
  • HIGH GAIN ACCURACY: G = 5, 0.07%, 2ppm/°C
  • GAIN SET WITH EXTERNAL RESISTORS
  • 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
  • LOW COST
  • LOW QUIESCENT CURRENT: 40µA/channel
    Shut Down: < 1µA
  • HIGH GAIN ACCURACY: G = 5, 0.07%, 2ppm/°C
  • GAIN SET WITH EXTERNAL RESISTORS
  • 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 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 40µA. When shutdown the INA322 has a quiescent current of less than 1µA. Returning to normal operations within nanoseconds, the shutdown feature makes the INA322 optimal for low-power battery or multiplexing applications.

Configured internally for 5V/V gain, the INA322 offers exceptional flexibility with user-programmable external gain resistors. The INA322 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 INA322 ideal for driving sampling Analog-to-Digital (A/D) converters as well as general-purpose applications. With high precision, low cost, and small packaging, the INA322 outperforms discrete designs, while offering reliability and performance.

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