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INA128

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

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

INA128

ACTIVE
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Product details

Parameters

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 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.2 Gain non-linearity (+/-) (Max) (%) 0.004 open-in-new Find other Instrumentation amplifiers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new Find other Instrumentation amplifiers

Features

  • A newer version of this device is now available: INA828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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Description

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) Apr. 08, 2019
Technical article What is an instrumentation amplifier? Aug. 09, 2019
Application note Comprehensive Error Calculation for Instrumentation Amplifiers Mar. 26, 2019
Application note A Numerical Protection Relay Solution (Rev. A) Jul. 26, 2018
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical article How to layout a PCB for an instrumentation amplifier Oct. 14, 2016
User guide Instrumentation Amplifier With DC Rejection Design Guide May 14, 2015
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) Nov. 25, 2013
Technical article What you need to know about CMRR – Instrumentation amplifier topologies (Part 3) Nov. 06, 2013
Application note Getting the most out of your instrumentation amplifier design Oct. 10, 2005

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
Description

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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Design tools & simulation

SIMULATION MODEL Download
SBOM762.TSC (88 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SBOM763.ZIP (5 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SBOM764.ZIP (39 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
View details
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI — 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 (...)
document-generic User guide
CALCULATION TOOL Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — 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 (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
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Reference designs

REFERENCE DESIGNS Download
Instrumentation Amplifier with DC Rejection Reference Design
TIPD191 — 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-generic Schematic document-generic User guide
Design files
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CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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