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INA326

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Precision, Low Drift, CMOS Instrumentation Amplifier

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Data sheet
Precision, Low Drift, CMOS Instrumentation Amplifier

INA326

ACTIVE
Data sheet Order now

Product details

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) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 33 Features Cost Optimized 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 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.005 Output swing headroom (to positive supply) (Typ) (V) -0.005 Input common mode headroom (to negative supply) (Typ) (V) -0.02 Input common mode headroom (to positive supply) (Typ) (V) 0.1 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.8 Gain non-linearity (+/-) (Max) (%) 0.01
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) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 33 Features Cost Optimized 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 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.005 Output swing headroom (to positive supply) (Typ) (V) -0.005 Input common mode headroom (to negative supply) (Typ) (V) -0.02 Input common mode headroom (to positive supply) (Typ) (V) 0.1 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.8 Gain non-linearity (+/-) (Max) (%) 0.01
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VSSOP (DGK) 8 15 mm² 3 x 4.9
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  • 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
  • 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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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.

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

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Type Title Date
* Data sheet INA326, 327: Precision, Rail-To-Rail I/O Instrumentation Amplifier datasheet (Rev. D) 03 Nov 2004
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 3-decade, load-current sensing circuit (Rev. A) 01 Feb 2019
Application note Low-level voltage-to-current converter circuit 09 Jan 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
Analog design journal A dual-polarity, bidirectional current-shunt monitor 22 Oct 2008
Analog design journal Q4 2008 Issue Analog Applications Journal 22 Oct 2008
Application note Low-Cost Noise-Immune Isolated Thermocouple Signal Processor 08 Jan 2007
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

PLABS-SAR-EVM-PDK — TI Precision Labs SAR ADC Evaluation Module Performance Demonstration Kit (PDK)

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 (...)

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Simulation model

INA326 TINA-TI Reference Design Enhanced Long Simulation Time (Rev. B)

SBOC169B.TSC (119 KB) - TINA-TI Reference Design
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Simulation model

INA326T TINA-TI Reference Design Standard-Recommended (Rev. B)

SBOC170B.TSC (129 KB) - TINA-TI Reference Design
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Simulation model

INA326 PSpice Model (Rev. A)

SBOM150A.ZIP (108 KB) - PSpice Model
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Simulation model

INA326 TINA-TI Spice Model Enhanced-Long Simulation Time (Rev. A)

SBOM248A.ZIP (10 KB) - TINA-TI Spice Model
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Simulation model

INA326T TINA-TI Spice Model Standard-Recommended (Rev. A)

SBOM249A.ZIP (9 KB) - TINA-TI Spice 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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Design tool

CIRCUIT060031 — 3-decade, load-current sensing circuit

This single-supply, low-side, current-sensing solution accurately detects load current between 10 μA and 10 mA. A unique yet simple gain switching network was implemented to accurately measure the three decade load current range.
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Design tool

CIRCUIT060043 — Low-level voltage-to-current converter circuit

This circuit delivers a precise low-level current, IL, to a load, RL. The design operates on a single 5-V supply and uses one precision low-drift op amp and one instrumentation amplifier. Simple modifications can change the range and accuracy of the voltage-to-current (V-I) converter.
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Design tool

Simulation for 3-Decade, Load-Current Sensing Circuit

SBOC498.ZIP (28 KB)
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Reference designs

TIPD193 — RTD to Voltage Reference Design Using Instrumentation Amplifier and Current Reference

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 (...)
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Reference designs

TIPD107 — Low-Level V-to-I Converter Reference Design, 0V to 5V input to 0uA to 5uA output

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 (...)
document-generic Schematic
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Reference designs

TIPD104 — Current Sensing Solution, 10uA-10mA, Low-side, Single Supply

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 (...)
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