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INA128

ACTIVE

Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier

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Data sheet
Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier

INA128

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 50 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 8 Features Current Feedback, Overvoltage Protection CMRR (Min) (dB) 120 Input offset drift (+/-) (Max) (uV/C) 0.5 Input bias current (+/-) (Max) (nA) 5 Iq (Typ) (mA) 0.7 Bandwidth at min gain (Typ) (MHz) 1.3 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 125 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.8 Output swing headroom (to positive supply) (Typ) (V) -0.9 Input common mode headroom (to negative supply) (Typ) (V) 1.7 Input common mode headroom (to positive supply) (Typ) (V) -1.4 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.2 Gain non-linearity (+/-) (Max) (%) 0.004
Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 50 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 8 Features Current Feedback, Overvoltage Protection CMRR (Min) (dB) 120 Input offset drift (+/-) (Max) (uV/C) 0.5 Input bias current (+/-) (Max) (nA) 5 Iq (Typ) (mA) 0.7 Bandwidth at min gain (Typ) (MHz) 1.3 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 125 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.8 Output swing headroom (to positive supply) (Typ) (V) -0.9 Input common mode headroom (to negative supply) (Typ) (V) 1.7 Input common mode headroom (to positive supply) (Typ) (V) -1.4 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.2 Gain non-linearity (+/-) (Max) (%) 0.004
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PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 —
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  • A newer version of this device is now available: INA828
  • Low offset voltage: 50 µV maximum
  • Low drift: 0.5 µV/°C maximum
  • Low Input Bias Current: 5 nA maximum
  • High CMR: 120 dB minimum
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 V to ±18 V
  • Low quiescent current: 700 µA
  • Packages: 8-pin plastic DIP, SO-8
  • A newer version of this device is now available: INA828
  • Low offset voltage: 50 µV maximum
  • Low drift: 0.5 µV/°C maximum
  • Low Input Bias Current: 5 nA maximum
  • High CMR: 120 dB minimum
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 V to ±18 V
  • Low quiescent current: 700 µA
  • Packages: 8-pin plastic DIP, SO-8
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The INA128 and INA129 are low-power, general purpose instrumentation amplifiers offering excellent accuracy. The versatile 3-op amp design and small size make these amplifiers ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation; the INA129 gain equation is compatible with the AD620.

The INA12x is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

The upgraded INA828 offers a lower input bias current (0.6 nA maximum) and lower noise (7 nV/√Hz) at the same quiescent current. See the Device Comparsion Table for a selection of precision instrumentation amplifiers from Texas Instruments.

The INA128 and INA129 are low-power, general purpose instrumentation amplifiers offering excellent accuracy. The versatile 3-op amp design and small size make these amplifiers ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation; the INA129 gain equation is compatible with the AD620.

The INA12x is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

The upgraded INA828 offers a lower input bias current (0.6 nA maximum) and lower noise (7 nV/√Hz) at the same quiescent current. See the Device Comparsion Table for a selection of precision instrumentation amplifiers from Texas Instruments.

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Drop-in replacement with upgraded functionality to the compared device.
INA828 ACTIVE 50-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier Higher GBW (2MHz), identical DC precision, higher CMRR (140dB Min) and lower bias current (0.6nA max) while reducing BOM cost

Technical documentation

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Type Title Date
* Data sheet INA12x Precision, Low-Power Instrumentation Amplifiers datasheet (Rev. E) 08 Apr 2019
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps 27 Jul 2021
Technical article What is an instrumentation amplifier? 09 Aug 2019
Application note Comprehensive Error Calculation for Instrumentation Amplifiers 26 Mar 2019
Application note A Numerical Protection Relay Solution (Rev. A) 26 Jul 2018
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
User guide Instrumentation Amplifier With DC Rejection Design Guide 14 May 2015
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013
Technical article What you need to know about CMRR – Instrumentation amplifier topologies (Part 3) 06 Nov 2013
Analog design journal Getting the most out of your instrumentation amplifier design 10 Oct 2005

Design & development

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

Evaluation board

INAEVM — Universal Instrumentation Amplifier Evaluation Module

The universal INAEVM (Instrumentation Amplifier Evaluation Module) is available in two package options that simplify prototyping precision instrumentation amplifiers in either the SO-8 (D) package or the MSOP-8(DGK) package with the pinout shown.  See the chart in the user guide (...)

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Simulation model

INA128 TINA TI Reference Design

SBOM762.TSC (88 KB) - TINA-TI Reference Design
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Simulation model

INA128 TINA TI Spice Model

SBOM763.ZIP (5 KB) - TINA-TI Spice Model
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Simulation model

INA128 PSpice Model

SBOM764.ZIP (39 KB) - PSpice Model
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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 (...)
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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 op-amp gain with feedback (...)
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Reference designs

TIPD191 — Instrumentation Amplifier with DC Rejection Reference Design

This design is an ac coupled instrumentation amplifier. More specifically, the circuit amplifies ac differential input signals and rejects dc differential and common mode signals. The input is dc coupled, so it achieves effective ac coupling by shifting the instrumentation amplifier reference (...)
document-pdfAcrobat Schematic
document-pdfAcrobat User guide
Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options

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