INA321

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MicroPower (40-µA) plus shutdown, 500-µV offset, 10-pA bias, RRO instrumentation amp

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Product details

Parameters

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 CMRR (Min) (dB) 90 Input offset drift (+/-) (Max) (uV/C) 7 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 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 20 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

  • 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

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Description

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

= Featured
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet microPower Single-Supply CMOS Instrumentation Amplifier datasheet (Rev. D) Jan. 31, 2006
Technical articles What is an instrumentation amplifier? Aug. 09, 2019
More literature 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 Why doesn’t my INA CMRR change with gain? Feb. 28, 2014
Technical articles Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) Nov. 25, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SBOC009A.ZIP (55 KB) - PSpice Model
SIMULATION MODELS Download
SBOC167B.TSC (86 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM228A.ZIP (3 KB) - TINA-TI Spice Model
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

Reference designs

REFERENCE DESIGNS Download
Low Power EKG & Heart Rate Monitor Reference Design, Featuring the MSP430FG439
TIDM-EKG-HRM This design details how to build a digital heart-rate monitor using a MSP430FG439 microcontroller (MCU). The heartbeat rate per minute is displayed on an LCD and generates a digital data stream via an RS232 serial port to allow EKG waveform display on a PC. The entire application runs using a CR2032 (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

Support & training

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