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INA118

ACTIVE

Precision, Low Power Instrumentation Amplifier

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Data sheet

INA118

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 2.7 Input offset (±) (max) (µV) 50 Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 10 Features Overvoltage protection CMRR (min) (dB) 110 Input offset drift (±) (max) (V/°C) 0.0000005 Input bias current (±) (max) (nA) 5 Iq (typ) (mA) 0.35 Bandwidth at min gain (typ) (MHz) 0.8 Gain error (±) (max) (%) 0.5 Operating temperature range (°C) -40 to 85 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.002 Output swing headroom (to negative supply) (typ) (V) 0.2 Output swing headroom (to positive supply) (typ) (V) -0.8 Input common mode headroom (to negative supply) (typ) (V) 0.95 Input common mode headroom (to positive supply) (typ) (V) -0.65 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 0.28
Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 2.7 Input offset (±) (max) (µV) 50 Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 10 Features Overvoltage protection CMRR (min) (dB) 110 Input offset drift (±) (max) (V/°C) 0.0000005 Input bias current (±) (max) (nA) 5 Iq (typ) (mA) 0.35 Bandwidth at min gain (typ) (MHz) 0.8 Gain error (±) (max) (%) 0.5 Operating temperature range (°C) -40 to 85 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.002 Output swing headroom (to negative supply) (typ) (V) 0.2 Output swing headroom (to positive supply) (typ) (V) -0.8 Input common mode headroom (to negative supply) (typ) (V) 0.95 Input common mode headroom (to positive supply) (typ) (V) -0.65 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 0.28
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6
  • A newer version of this device is now available: INA818
  • Low offset voltage: 50 µV, maximum
  • Low drift: 0.5 µV/°C, maximum
  • Low input bias current: 5 nA, maximum
  • High CMR: 110 dB, minimum
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 to ±18 V
  • Low quiescent current: 350 µA
  • Packages: 8-Pin plastic DIP, SO-8
  • A newer version of this device is now available: INA818
  • Low offset voltage: 50 µV, maximum
  • Low drift: 0.5 µV/°C, maximum
  • Low input bias current: 5 nA, maximum
  • High CMR: 110 dB, minimum
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 to ±18 V
  • Low quiescent current: 350 µA
  • Packages: 8-Pin plastic DIP, SO-8

The INA118 is a low-power, general-purpose instrumentation amplifier offering excellent accuracy. The versatile, three op amp design and small size make this device an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth, even at high gain (70 kHz at G = 100).

A single external resistor sets any gain from 1 to 10000. Internal input protection can withstand up to ±40 V without damage.

The INA118 is laser-trimmed for low offset voltage (50 µV), drift (0.5 µV/°C), and high common-mode rejection (110 dB at G = 1000). The INA118 operates with power supplies as low as ±2.25 V, and quiescent current is only 350 µA, making this device an excellent choice for battery-operated systems.

The INA118 is available in 8-pin plastic DIP and SO-8 surface-mount packages, and specified for the –40°C to +85°C temperature range.

The upgraded INA818 offers a lower input stage offset voltage (35 µV, maximum), lower input bias current (0.5 nA maximum) and lower noise (8 nV/√Hz) at the same quiescent current. See the Device Comparison Table for a selection of precision instrumentation amplifiers from Texas Instruments.

The INA118 is a low-power, general-purpose instrumentation amplifier offering excellent accuracy. The versatile, three op amp design and small size make this device an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth, even at high gain (70 kHz at G = 100).

A single external resistor sets any gain from 1 to 10000. Internal input protection can withstand up to ±40 V without damage.

The INA118 is laser-trimmed for low offset voltage (50 µV), drift (0.5 µV/°C), and high common-mode rejection (110 dB at G = 1000). The INA118 operates with power supplies as low as ±2.25 V, and quiescent current is only 350 µA, making this device an excellent choice for battery-operated systems.

The INA118 is available in 8-pin plastic DIP and SO-8 surface-mount packages, and specified for the –40°C to +85°C temperature range.

The upgraded INA818 offers a lower input stage offset voltage (35 µV, maximum), lower input bias current (0.5 nA maximum) and lower noise (8 nV/√Hz) at the same quiescent current. See the Device Comparison Table for a selection of precision instrumentation amplifiers from Texas Instruments.
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INA818 ACTIVE Low power (350-µA), precision instrumentation amp with ±60-V overvoltage protection (gain pins 1, 8) Pin-to-pin device with higher GBW (2MHz), higher DC precision (35µV max Vos, 0.4 µV/C max drift), higher CMRR (140dB Min) and lower bias current (0.5nA max)

Technical documentation

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Type Title Date
* Data sheet INA118 Precision, Low-Power Instrumentation Amplifier datasheet (Rev. C) PDF | HTML 30 Sep 2022
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML 27 Jul 2021
E-book An Engineer’s Guide to Designing with Precision Amplifiers 29 Apr 2021
Technical article What is an instrumentation amplifier? 09 Aug 2019
Application note Comprehensive Error Calculation for Instrumentation Amplifiers 26 Mar 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
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013
Analog Design Journal Getting the most out of your instrumentation amplifier design 10 Oct 2005

Design & development

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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 (...)

User guide: PDF | HTML
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Simulation model

INA118 PSpice Model (Rev. B)

SBOM016B.ZIP (23 KB) - PSpice Model
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Simulation model

INA118 TINA-TI Reference Design (Rev. B)

SBOC151B.TSC (109 KB) - TINA-TI Reference Design
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Simulation model

INA118 TINA-TI Spice Model (Rev. A)

SBFC023A.ZIP (5 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 (...)
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Reference designs

TIDA-010032 — Universal data concentrator reference design supporting Ethernet, 6LoWPAN RF mesh & more

IPv6-based grid communications are becoming the standard choice in industrial markets and applications like smart meters and grid automation. The universal data concentrator design provides a complete IPv6-based network solution integrated with Ethernet backbone communication, 6LoWPAN RF mesh (...)
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Schematic: PDF
Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
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