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INA2128

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Dual, Low Power Instrumentation Amplifier

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Data sheet

INA2128

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 2 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 85 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) (%) 0.002
Number of channels (#) 2 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 85 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) (%) 0.002
SOIC (DW) 16 77 mm² 7.52 x 10.28
  • LOW OFFSET VOLTAGE: 50µV max
  • LOW DRIFT: 0.5µV/°C max
  • LOW INPUT BIAS CURRENT: 5nA max
  • HIGH CMR: 120dB min
  • INPUTS PROTECTED to ±40V
  • WIDE SUPPLY RANGE: ±2.25V to ±18V
  • LOW QUIESCENT CURRENT: 700µA / IA
  • 16-PIN PLASTIC DIP, SOL-16
  • APPLICATIONS
    • SENSOR AMPLIFIER THERMOCOUPLE, RTD, BRIDGE
    • MEDICAL INSTRUMENTATION
    • MULTIPLE-CHANNEL SYSTEMS
    • BATTERY OPERATED EQUIPMENT

All trademarks are the property of their respective owners.
  • LOW OFFSET VOLTAGE: 50µV max
  • LOW DRIFT: 0.5µV/°C max
  • LOW INPUT BIAS CURRENT: 5nA max
  • HIGH CMR: 120dB min
  • INPUTS PROTECTED to ±40V
  • WIDE SUPPLY RANGE: ±2.25V to ±18V
  • LOW QUIESCENT CURRENT: 700µA / IA
  • 16-PIN PLASTIC DIP, SOL-16
  • APPLICATIONS
    • SENSOR AMPLIFIER THERMOCOUPLE, RTD, BRIDGE
    • MEDICAL INSTRUMENTATION
    • MULTIPLE-CHANNEL SYSTEMS
    • BATTERY OPERATED EQUIPMENT

All trademarks are the property of their respective owners.

The INA2128 is a dual, low power, general purpose instrumentation amplifier offering excellent accuracy. Its versatile 3-op amp design and small size make it ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. Internal input protection can withstand up to ±40V without damage.

The INA2128 is laser trimmed for very low offset voltage (50µV), drift (0.5µV/°C) and high common-mode rejection (120dB at G ≥ 100). It operates with power supplies as low as ±2.25V, and quiescent current is only 700µA per IA—ideal for battery operated and multiple-channel systems.

The INA2128 is available in 16-pin plastic DIP, and SOL-16 surface-mount packages, specified for the -40°C to +85°C temperature range.

The INA2128 is a dual, low power, general purpose instrumentation amplifier offering excellent accuracy. Its versatile 3-op amp design and small size make it ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. Internal input protection can withstand up to ±40V without damage.

The INA2128 is laser trimmed for very low offset voltage (50µV), drift (0.5µV/°C) and high common-mode rejection (120dB at G ≥ 100). It operates with power supplies as low as ±2.25V, and quiescent current is only 700µA per IA—ideal for battery operated and multiple-channel systems.

The INA2128 is available in 16-pin plastic DIP, and SOL-16 surface-mount packages, specified for the -40°C to +85°C temperature range.
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Technical documentation

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Type Title Date
* Data sheet Dual, Low Power Instrumentation Amplifier datasheet (Rev. A) 25 Apr 2007
User guide INA-DUAL-2AMP-EVM User's Guide PDF | HTML 12 Nov 2021
Certificate INA-DUAL-2AMP-EVM EU RoHS Declaration of Conformity (DoC) 07 Sep 2021
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
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.

Evaluation board

INA-DUAL-2AMP-EVM — Universal instrumentation amplifier evaluation module for dual-channel two-amp INA devices

The INA-DUAL-2AMP-EVM is an evaluation module (EVM) that is compatible with a variety of dual-channel two-amp instrumentation amplifiers (INAs). This EVM is compatible with the SOIC-16 (D) and SOIC-16 (DW) INA packages and is designed to evaluate the performance of the devices in both single-supply (...)

User guide: PDF | HTML
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Simulation model

INA2128 PSpice Model (Rev. B)

SBOM022B.ZIP (58 KB) - PSpice Model
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Simulation model

INA2128 TINA-TI Reference Design (Rev. C)

SBOC146C.TSC (90 KB) - TINA-TI Reference Design
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Simulation model

INA2128 TINA-TI Spice Model (Rev. B)

SBOM215B.ZIP (6 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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SOIC (DW) 16 View options

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