Product details

Number of channels (#) 1 Vs (Max) (V) 5.5 Vs (Min) (V) 2.5 Input offset (+/-) (Max) (uV) 500 Gain (Min) (V/V) 5 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 46 Features Cost Optimized, Shutdown CMRR (Min) (dB) 90 Input bias current (+/-) (Max) (nA) 0.01 Iq (Typ) (mA) 0.415 Bandwidth at min gain (Typ) (MHz) 2 Gain error (+/-) (Max) (%) 0.1 Operating temperature range (C) -55 to 125 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.025 Output swing headroom (to positive supply) (Typ) (V) -0.025 Input common mode headroom (to negative supply) (Typ) (V) 0.55 Input common mode headroom (to positive supply) (Typ) (V) -1.7 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 7 Gain non-linearity (+/-) (Max) (%) 0.01
Number of channels (#) 1 Vs (Max) (V) 5.5 Vs (Min) (V) 2.5 Input offset (+/-) (Max) (uV) 500 Gain (Min) (V/V) 5 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 46 Features Cost Optimized, Shutdown CMRR (Min) (dB) 90 Input bias current (+/-) (Max) (nA) 0.01 Iq (Typ) (mA) 0.415 Bandwidth at min gain (Typ) (MHz) 2 Gain error (+/-) (Max) (%) 0.1 Operating temperature range (C) -55 to 125 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.025 Output swing headroom (to positive supply) (Typ) (V) -0.025 Input common mode headroom (to negative supply) (Typ) (V) 0.55 Input common mode headroom (to positive supply) (Typ) (V) -1.7 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 7 Gain non-linearity (+/-) (Max) (%) 0.01
VSSOP (DGK) 8 15 mm² 3 x 4.9
  • DESIGNED FOR LOW COST
  • HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C
  • GAIN SET WITH EXT. RESISTORS FOR >5V/V
  • LOW OFFSET VOLTAGE: ±250 µV
  • HIGH CMRR: 94dB DC, 50dB at 45kHz
  • LOW BIAS CURRENT: 0.5pA
  • BANDWIDTH, SLEW RATE: 2.0MHz, 5V/µs
  • RAIL-TO-RAIL OUTPUT SWING: (V+)– 0.02V
  • WIDE TEMPERATURE RANGE: –55°C to +125°C
  • LOW QUIESCENT CURRENT: 490 µA max/chan
  • SHUT DOWN: 0.01 µA
  • MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES
  • APPLICATIONS
    • INDUSTRIAL SENSOR AMPLIFIERS:
        Bridge, RTD, Thermocouple, Position
    • PHYSIOLOGICAL AMPLIFIERS:
        ECG, EEG, EMG
    • A/D CONVERTER SIGNAL CONDITIONING
    • DIFFERENTIAL LINE RECEIVERS WITH GAIN
    • FIELD UTILITY METERS
    • PCMCIA CARDS
    • AUDIO AMPLIFIERS
    • COMMUNICATION SYSTEMS
    • TEST EQUIPMENT
    • AUTOMOTIVE INSTRUMENTATION

All trademarks are the property of their respective owners.

  • DESIGNED FOR LOW COST
  • HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C
  • GAIN SET WITH EXT. RESISTORS FOR >5V/V
  • LOW OFFSET VOLTAGE: ±250 µV
  • HIGH CMRR: 94dB DC, 50dB at 45kHz
  • LOW BIAS CURRENT: 0.5pA
  • BANDWIDTH, SLEW RATE: 2.0MHz, 5V/µs
  • RAIL-TO-RAIL OUTPUT SWING: (V+)– 0.02V
  • WIDE TEMPERATURE RANGE: –55°C to +125°C
  • LOW QUIESCENT CURRENT: 490 µA max/chan
  • SHUT DOWN: 0.01 µA
  • MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES
  • APPLICATIONS
    • INDUSTRIAL SENSOR AMPLIFIERS:
        Bridge, RTD, Thermocouple, Position
    • PHYSIOLOGICAL AMPLIFIERS:
        ECG, EEG, EMG
    • A/D CONVERTER SIGNAL CONDITIONING
    • DIFFERENTIAL LINE RECEIVERS WITH GAIN
    • FIELD UTILITY METERS
    • PCMCIA CARDS
    • AUDIO AMPLIFIERS
    • COMMUNICATION SYSTEMS
    • TEST EQUIPMENT
    • AUTOMOTIVE INSTRUMENTATION

All trademarks are the property of their respective owners.

The INA331 and INA2331 are rail-to-rail output, low-power CMOS instrumentation amplifiers that offer wide range, single-supply operation as well as bipolar-supply operation. The INA331 family provides low-cost, low-noise amplification of differential signals with a low quiescent current of 415µA (dropping to 0.01µA when shutdown). Returning to normal operation within microseconds, this INA can be used for battery or multi-channel applications.

Configured internally in a gain of 5V/V, the INA331 offers flexibility in higher gains by choosing external resistors.

The INA331 rejects line noise and its harmonics, because common-mode error remains low even at higher frequencies.

High bandwidth and slew rate makes the INA331 ideal for directly driving sampling Analog-to-Digital (A/D) converters as well as general-purpose applications.

With high precision, low cost, and small packages, the INA331 outperforms discrete designs. They are specified for a wide temperature range of -55°C to +125°C.

The INA331 and INA2331 are rail-to-rail output, low-power CMOS instrumentation amplifiers that offer wide range, single-supply operation as well as bipolar-supply operation. The INA331 family provides low-cost, low-noise amplification of differential signals with a low quiescent current of 415µA (dropping to 0.01µA when shutdown). Returning to normal operation within microseconds, this INA can be used for battery or multi-channel applications.

Configured internally in a gain of 5V/V, the INA331 offers flexibility in higher gains by choosing external resistors.

The INA331 rejects line noise and its harmonics, because common-mode error remains low even at higher frequencies.

High bandwidth and slew rate makes the INA331 ideal for directly driving sampling Analog-to-Digital (A/D) converters as well as general-purpose applications.

With high precision, low cost, and small packages, the INA331 outperforms discrete designs. They are specified for a wide temperature range of -55°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet Low-Power, Single-Supply, CMOS Instrumentation Amplifiers datasheet (Rev. C) 04 Apr 2005
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
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
Analog Design Journal Linear operating region of two-op-amp instrumentation amplifiers with gain stage 21 Jul 2016
Technical article Why doesn’t my INA CMRR change with gain? 28 Feb 2014
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.

Simulation model

INA331 PSpice Model (Rev. B)

SBOC014B.ZIP (28 KB) - PSpice Model
Simulation model

INA331 TINA-TI Reference Design (Rev. B)

SBOC173B.TSC (93 KB) - TINA-TI Reference Design
Simulation model

INA331 TINA-TI Spice Model (Rev. A)

SBOM252A.ZIP (9 KB) - TINA-TI Spice Model
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 (...)
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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