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INA122

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Single Supply, MicroPower Instrumentation Amplifier

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Data sheet

INA122

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 2.2 Input offset (+/-) (Max) (uV) 250 Gain (Min) (V/V) 5 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 60 Features Low power CMRR (Min) (dB) 83 Input offset drift (+/-) (Max) (uV/C) 3 Input bias current (+/-) (Max) (nA) 25 Iq (Typ) (mA) 0.06 Bandwidth at min gain (Typ) (MHz) 0.12 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 85 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.1 Output swing headroom (to positive supply) (Typ) (V) -0.05 Input common mode headroom (to negative supply) (Typ) (V) 0 Input common mode headroom (to positive supply) (Typ) (V) -1.6 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 2 Gain non-linearity (+/-) (Max) (%) 0.002
Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 2.2 Input offset (+/-) (Max) (uV) 250 Gain (Min) (V/V) 5 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 60 Features Low power CMRR (Min) (dB) 83 Input offset drift (+/-) (Max) (uV/C) 3 Input bias current (+/-) (Max) (nA) 25 Iq (Typ) (mA) 0.06 Bandwidth at min gain (Typ) (MHz) 0.12 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 85 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.1 Output swing headroom (to positive supply) (Typ) (V) -0.05 Input common mode headroom (to negative supply) (Typ) (V) 0 Input common mode headroom (to positive supply) (Typ) (V) -1.6 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 2 Gain non-linearity (+/-) (Max) (%) 0.002
PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9
  • LOW QUIESCENT CURRENT: 60µA
  • WIDE POWER SUPPLY RANGE
    • Single Supply: 2.2V to 36V
    • Dual Supply: -0.9/+1.3V to ±18V
  • COMMON-MODE RANGE to (V-)-0.1V
  • RAIL-TO-RAIL OUTPUT SWING
  • LOW OFFSET VOLTAGE: 250µV max
  • LOW OFFSET DRIFT: 3µV/°C max
  • LOW NOISE: 60nV/sqrt(Hz)
  • LOW INPUT BIAS CURRENT: 25nA max
  • 8-PIN DIP AND SO-8 SURFACE-MOUNT
  • LOW QUIESCENT CURRENT: 60µA
  • WIDE POWER SUPPLY RANGE
    • Single Supply: 2.2V to 36V
    • Dual Supply: -0.9/+1.3V to ±18V
  • COMMON-MODE RANGE to (V-)-0.1V
  • RAIL-TO-RAIL OUTPUT SWING
  • LOW OFFSET VOLTAGE: 250µV max
  • LOW OFFSET DRIFT: 3µV/°C max
  • LOW NOISE: 60nV/sqrt(Hz)
  • LOW INPUT BIAS CURRENT: 25nA max
  • 8-PIN DIP AND SO-8 SURFACE-MOUNT

The INA122 is a precision instrumentation amplifier for accurate, low noise differential signal acquisition. Its two-op-amp design provides excellent performance with very low quiescent current, and is ideal for portable instrumentation and data acquisition systems.

The INA122 can be operated with single power supplies from 2.2V to 36V and quiescent current is a mere 60µA. It can also be operated from dual supplies. By utilizing an input level-shift network, input common-mode range extends to 0.1V below negative rail (single supply ground).

A single external resistor sets gain from 5V/V to 10000V/V. Laser trimming provides very low offset voltage (250µV max), offset voltage drift (3µV/°C max) and excellent common-mode rejection.

Packages options include 8-pin plastic DIP and SO-8 surface-mount packages. Both are specified for the -40°C to +85°C extended industrial temperature range.

The INA122 is a precision instrumentation amplifier for accurate, low noise differential signal acquisition. Its two-op-amp design provides excellent performance with very low quiescent current, and is ideal for portable instrumentation and data acquisition systems.

The INA122 can be operated with single power supplies from 2.2V to 36V and quiescent current is a mere 60µA. It can also be operated from dual supplies. By utilizing an input level-shift network, input common-mode range extends to 0.1V below negative rail (single supply ground).

A single external resistor sets gain from 5V/V to 10000V/V. Laser trimming provides very low offset voltage (250µV max), offset voltage drift (3µV/°C max) and excellent common-mode rejection.

Packages options include 8-pin plastic DIP and SO-8 surface-mount packages. Both are specified for the -40°C to +85°C extended industrial temperature range.
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Technical documentation

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Type Title Date
* Data sheet Single Supply, MicroPower Instrumentation Amplifier datasheet 27 Sep 2000
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML 27 Jul 2021
Technical article What is an instrumentation amplifier? 09 Aug 2019
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article How to layout a PCB for an instrumentation amplifier 14 Oct 2016
EVM User's guide Universal Instrumentation Amplifier EVM User’s Guide (Rev. B) PDF | HTML 09 Aug 2016
Analog Design Journal 4Q 2015 Analog Applications Journal 30 Oct 2015
Analog Design Journal VCM vs. VOUT plots for instrumentation amplifiers with two op amps 30 Oct 2015
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

INA122 TINA-TI Reference Design (Rev. B)

SBOC142B.TSC (67 KB) - TINA-TI Reference Design
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Simulation model

INA122 TINA-TI Spice Model (Rev. A)

SBOM211A.ZIP (4 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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PDIP (P) 8 View options
SOIC (D) 8 View options

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