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)) 100 Features Cost Optimized, Shutdown CMRR (Min) (dB) 90 Input bias current (+/-) (Max) (nA) 0.01 Iq (Typ) (mA) 0.04 Bandwidth at min gain (Typ) (MHz) 0.5 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) 20 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)) 100 Features Cost Optimized, Shutdown CMRR (Min) (dB) 90 Input bias current (+/-) (Max) (nA) 0.01 Iq (Typ) (mA) 0.04 Bandwidth at min gain (Typ) (MHz) 0.5 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) 20 Gain non-linearity (+/-) (Max) (%) 0.01
VSSOP (DGK) 8 15 mm² 3 x 4.9
  • LOW QUIESCENT CURRENT: 40µA/channel Shut Down: < 1µA
  • HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C
  • GAIN SET WITH EXTERNAL RESISTORS
  • LOW OFFSET VOLTAGE: ±200µV
  • HIGH CMRR: 94dB
  • LOW BIAS CURRENT: 10pA
  • BANDWIDTH: 500kHz, G = 5V/V
  • RAIL-TO-RAIL OUTPUT SWING: (V+) - 0.02V
  • WIDE TEMPERATURE RANGE: -55°C to +125°C
  • SINGLE VERSION IN MSOP-8 PACKAGE AND DUAL VERSION IN TSSOP-14 PACKAGE
  • APPLICATIONS
    • INDUSTRIAL SENSOR AMPLIFIERS: Bridge, RTD, Thermistor, Position
    • PHYSIOLOGICAL AMPLIFIERS: ECG, EEG, EMG
    • A/D CONVERTER SIGNAL CONDITIONING
    • DIFFERENTIAL LINE RECEIVERS WITH GAIN
    • FIELD UTILITY METERS
    • PCMCIA CARDS
    • COMMUNICATION SYSTEMS
    • TEST EQUIPMENT
    • AUTOMOTIVE INSTRUMENTATION

All trademarks are the property of their respective owners.

  • LOW QUIESCENT CURRENT: 40µA/channel Shut Down: < 1µA
  • HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C
  • GAIN SET WITH EXTERNAL RESISTORS
  • LOW OFFSET VOLTAGE: ±200µV
  • HIGH CMRR: 94dB
  • LOW BIAS CURRENT: 10pA
  • BANDWIDTH: 500kHz, G = 5V/V
  • RAIL-TO-RAIL OUTPUT SWING: (V+) - 0.02V
  • WIDE TEMPERATURE RANGE: -55°C to +125°C
  • SINGLE VERSION IN MSOP-8 PACKAGE AND DUAL VERSION IN TSSOP-14 PACKAGE
  • APPLICATIONS
    • INDUSTRIAL SENSOR AMPLIFIERS: Bridge, RTD, Thermistor, Position
    • PHYSIOLOGICAL AMPLIFIERS: ECG, EEG, EMG
    • A/D CONVERTER SIGNAL CONDITIONING
    • DIFFERENTIAL LINE RECEIVERS WITH GAIN
    • FIELD UTILITY METERS
    • PCMCIA CARDS
    • COMMUNICATION SYSTEMS
    • TEST EQUIPMENT
    • AUTOMOTIVE INSTRUMENTATION

All trademarks are the property of their respective owners.

The INA321 family is a series of rail-to-rail output, micropower CMOS instrumentation amplifiers that offer wide-range, single-supply, as well as bipolar-supply operation. The INA321 family provides low-cost, low-noise amplification of differential signals with micropower current consumption of 40µA. When shutdown, the INA321 has a quiescent current of less than 1µA. Returning to normal operations within nanoseconds, the shutdown feature makes the INA321 optimal for low-power battery or multiplexing applications.

Configured internally for 5V/V gain, the INA321 offers exceptional flexibility with user-programmable external gain resistors. The INA321 reduces common-mode error over frequency and with CMRR remaining high up to 3kHz, line noise and line harmonics are rejected.

The low-power design does not compromise on bandwidth or slew rate, making the INA321 ideal for driving sample Analog-to-Digital (A/D) converters as well as general-purpose applications. With high precision, low cost, and small packaging, the INA321 outperforms discrete designs, while offering reliability and performance.

The INA321 family is a series of rail-to-rail output, micropower CMOS instrumentation amplifiers that offer wide-range, single-supply, as well as bipolar-supply operation. The INA321 family provides low-cost, low-noise amplification of differential signals with micropower current consumption of 40µA. When shutdown, the INA321 has a quiescent current of less than 1µA. Returning to normal operations within nanoseconds, the shutdown feature makes the INA321 optimal for low-power battery or multiplexing applications.

Configured internally for 5V/V gain, the INA321 offers exceptional flexibility with user-programmable external gain resistors. The INA321 reduces common-mode error over frequency and with CMRR remaining high up to 3kHz, line noise and line harmonics are rejected.

The low-power design does not compromise on bandwidth or slew rate, making the INA321 ideal for driving sample Analog-to-Digital (A/D) converters as well as general-purpose applications. With high precision, low cost, and small packaging, the INA321 outperforms discrete designs, while offering reliability and performance.

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Technical documentation

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Type Title Date
* Data sheet microPower Single-Supply CMOS Instrumentation Amplifier datasheet (Rev. D) 31 Jan 2006
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
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 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

INA321 PSpice Model (Rev. A)

SBOC009A.ZIP (55 KB) - PSpice Model
Simulation model

INA321 TINA-TI Reference Design (Rev. B)

SBOC167B.TSC (86 KB) - TINA-TI Reference Design
Simulation model

INA321 TINA-TI Spice Model (Rev. A)

SBOM228A.ZIP (3 KB) - TINA-TI Spice Model
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 (...)
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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VSSOP (DGK) 8 View options

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