INA326

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Precision, Low Drift, CMOS Instrumentation Amplifier

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Product details

Parameters

Number of channels (#) 1 Vs (Max) (V) 5.5 Vs (Min) (V) 2.7 Input offset (+/-) (Max) (uV) 100 Gain (Min) (V/V) 0.1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 33 CMRR (Min) (dB) 100 Input offset drift (+/-) (Max) (uV/C) 0.4 Input bias current (+/-) (Max) (nA) 2 Iq (Typ) (mA) 2.4 Bandwidth at min gain (Typ) (MHz) 0.001 Gain error (+/-) (Max) (%) 0.2 Operating temperature range (C) -40 to 85 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.8 Gain non-linearity (+/-) (Max) (%) 0.01 open-in-new Find other Instrumentation amplifiers

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Instrumentation amplifiers

Features

  • PRECISION
       LOW OFFSET: 100 µV (max)
       LOW OFFSET DRIFT: 0.4 µV/°C (max)
       EXCELLENT LONG-TERM STABILITY
       VERY-LOW 1/f NOISE
  • TRUE RAIL-TO-RAIL I/O
       INPUT COMMON-MODE RANGE:
          20mV Below Negative Rail to 100mV Above Positive Rail
       WIDE OUTPUT SWING: Within 10mV of Rails
       SUPPLY RANGE: Single +2.7V to +5.5V
  • SMALL SIZE
       microPACKAGE: MSOP-8, MSOP-10
  • LOW COST
  • APPLICATIONS
    • LOW-LEVEL TRANSDUCER AMPLIFIER FOR BRIDGES, LOAD CELLS, THERMOCOUPLES
    • WIDE DYNAMIC RANGE SENSOR MEASUREMENTS
    • HIGH-RESOLUTION TEST SYSTEMS
    • WEIGH SCALES
    • MULTI-CHANNEL DATA ACQUISITION SYSTEMS
    • MEDICAL INSTRUMENTATION
    • GENERAL-PURPOSE

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Description

The INA326 and INA327 (with shutdown) are high-performance, low-cost, precision instrumentation amplifiers with rail-to-rail input and output. They are true single-supply instrumentation amplifiers with very low DC errors and input common-mode ranges that extends beyond the positive and negative rails. These features make them suitable for applications ranging from general-purpose to high-accuracy.

Excellent long-term stability and very low 1/f noise assure low offset voltage and drift throughout the life of the product.

The INA326 (without shutdown) comes in the MSOP-8 package. The INA327 (with shutdown) is offered in an MSOP-10. Both are specified over the industrial temperature range, –40°C to +85°C, with operation from –40°C to +125°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet INA326, 327: Precision, Rail-To-Rail I/O Instrumentation Amplifier datasheet (Rev. D) Nov. 03, 2004
Technical articles What is an instrumentation amplifier? Aug. 09, 2019
Application notes 3-decade, load-current sensing circuit (Rev. A) Feb. 01, 2019
Application notes Low-level voltage-to-current converter circuit Jan. 09, 2019
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical articles How to layout a PCB for an instrumentation amplifier Oct. 14, 2016
Technical articles Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) Nov. 25, 2013
Application notes A dual-polarity, bidirectional current-shunt monitor Oct. 22, 2008
Application notes Q4 2008 Issue Analog Applications Journal Oct. 22, 2008
Application notes Low-Cost Noise-Immune Isolated Thermocouple Signal Processor Jan. 08, 2007
Application notes 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 BOARDS Download
document-generic User guide
499
Description

PLABS-SAR-EVM-PDK is an experimental platform used in conjunction with TI Precision Labs videos to gain a deeper understanding of successive approximation register (SAR) analog-to-digital converter (ADC) circuits. The evaluation module (EVM) platform contains two channels for common SAR (...)

Features
  • Intuitive setup – PCB overlay shows the schematic
  • No external power supply required
  • Includes several coupon boards with different driving amplifier RC filters to facilitate experimentation
  • Ships with PHI controller - provides convenient interface to EVM over USB 2.0 (or higher) for power delivery (...)

Design tools & simulation

SIMULATION MODELS Download
SBOC169B.TSC (119 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOC170B.TSC (129 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM150A.ZIP (108 KB) - PSpice Model
SIMULATION MODELS Download
SBOM248A.ZIP (10 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBOM249A.ZIP (9 KB) - TINA-TI Spice Model
SIMULATION TOOLS 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
  • (...)
SIMULATION TOOLS 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 TOOLS 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
  • (...)
CALCULATION TOOLS Download
Common-Mode Input Range Calculator for Instrumentation Amplifiers
INA-CMV-CALC The Common-Mode Input Range Calculator is tool for quickly generating plots of an instrumentation amplifier’s common-mode input range vs output. The tool is compatible with both 2-amp and 3-amp instrumentation amplifiers utilizing any supply range.

The Common-Mode Input Range Calculator is pre-loaded (...)

Features
  • Preloaded with 20 of TI’s most popular instrumentation amplifier specifications
  • Customizable supply, gain, and voltage reference options
  • Calculator displays output limitations graphically and numerically
DESIGN TOOLS Download
SBOC498.ZIP (28 KB)

Reference designs

REFERENCE DESIGNS Download
RTD to Voltage Reference Design Using Instrumentation Amplifier and Current Reference
TIPD193 This reference design translates resistance temperature detectors (RTD) resistance to a voltage level convenient for an ADC input. A precision current reference provides excitation and an instrumentation amplifier scales the signal. The design also uses a three wire RTD configuration to minimize (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
Low-Level V-to-I Converter Reference Design, 0V to 5V input to 0uA to 5uA output
TIPD107 This Verified Design is a micro-Amp voltage-to-current (V-I) converter circuit that delivers a precise low level current to a load. The design operates on a single 5V supply and uses a precision low drift op-amp, and instrumentation amplifier. Simple modification can change the range and accuracy of (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Current Sensing Solution, 10uA-10mA, Low-side, Single Supply
TIPD104 This TI Reference Design provides the theory, component selection, and simulation of a single-supply, precision low-side current sensing solution that can accurately detect load currents from 10uA-10mA. The corresponding linear output is from 100mV to 4.9V. While traditional op amps can be used for (...)
document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

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