Product details

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 35 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 7 Features Super-beta, Small Size, Overvoltage Protection CMRR (Min) (dB) 136 Input offset drift (+/-) (Max) (uV/C) 0.4 Input bias current (+/-) (Max) (nA) 0.5 Iq (Typ) (mA) 0.6 Bandwidth at min gain (Typ) (MHz) 4.7 Gain error (+/-) (Max) (%) 0.15 Operating temperature range (C) -40 to 125 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.15 Output swing headroom (to positive supply) (Typ) (V) -0.15 Input common mode headroom (to negative supply) (Typ) (V) 2 Input common mode headroom (to positive supply) (Typ) (V) -2 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.14 Gain non-linearity (+/-) (Max) (%) 0.0015
Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 35 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 7 Features Super-beta, Small Size, Overvoltage Protection CMRR (Min) (dB) 136 Input offset drift (+/-) (Max) (uV/C) 0.4 Input bias current (+/-) (Max) (nA) 0.5 Iq (Typ) (mA) 0.6 Bandwidth at min gain (Typ) (MHz) 4.7 Gain error (+/-) (Max) (%) 0.15 Operating temperature range (C) -40 to 125 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 0.15 Output swing headroom (to positive supply) (Typ) (V) -0.15 Input common mode headroom (to negative supply) (Typ) (V) 2 Input common mode headroom (to positive supply) (Typ) (V) -2 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.14 Gain non-linearity (+/-) (Max) (%) 0.0015
SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (DRG) 8 9 mm² 3 x 3
  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Gain drift: 5 ppm/°C (G = 1),
    35 ppm/°C (G > 1) (max)
  • Noise: 7 nV/√Hz
  • Bandwidth: 4.7 MHz (G = 1), 290 kHz (G = 100)
  • Stable with 1-nF capacitive loads
  • Inputs protected up to ±40 V
  • Common-mode rejection: 112 dB, G = 10 (min)
  • Power supply rejection: 110 dB, G = 1 (min)
  • Supply current: 650 µA (max)
  • Supply range:
    • Single-supply: 4.5 V to 36 V
    • Dual-supply: ±2.25 V to ±18 V
  • Specified temperature range: –40°C to +125°C
  • Packages: 8-pin SOIC, VSSOP, and WSON
  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Gain drift: 5 ppm/°C (G = 1),
    35 ppm/°C (G > 1) (max)
  • Noise: 7 nV/√Hz
  • Bandwidth: 4.7 MHz (G = 1), 290 kHz (G = 100)
  • Stable with 1-nF capacitive loads
  • Inputs protected up to ±40 V
  • Common-mode rejection: 112 dB, G = 10 (min)
  • Power supply rejection: 110 dB, G = 1 (min)
  • Supply current: 650 µA (max)
  • Supply range:
    • Single-supply: 4.5 V to 36 V
    • Dual-supply: ±2.25 V to ±18 V
  • Specified temperature range: –40°C to +125°C
  • Packages: 8-pin SOIC, VSSOP, and WSON

The INA821 is a high-precision instrumentation amplifier that offers low power consumption and operates over a wide single-supply or dual-supply range. A single external resistor sets any gain from 1 to 10,000. The device has high precision as a result of super-beta input transistors, which provide low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. Additional circuitry protects the inputs against overvoltage up to ±40 V.

The INA821 is optimized to provide a high common-mode rejection ratio. At G = 1, the common-mode rejection ratio exceeds 92 dB across the full input common-mode range. The device is designed for low-voltage operation from a 4.5-V single supply, and dual supplies up to ±18 V.

The INA821 is available in 8-pin SOIC, VSSOP, and WSON packages, and is specified over the –40°C to +125°C temperature range.

The INA821 is a high-precision instrumentation amplifier that offers low power consumption and operates over a wide single-supply or dual-supply range. A single external resistor sets any gain from 1 to 10,000. The device has high precision as a result of super-beta input transistors, which provide low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. Additional circuitry protects the inputs against overvoltage up to ±40 V.

The INA821 is optimized to provide a high common-mode rejection ratio. At G = 1, the common-mode rejection ratio exceeds 92 dB across the full input common-mode range. The device is designed for low-voltage operation from a 4.5-V single supply, and dual supplies up to ±18 V.

The INA821 is available in 8-pin SOIC, VSSOP, and WSON packages, and is specified over the –40°C to +125°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet INA821 35-µV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier datasheet (Rev. D) 15 Jun 2020
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps 27 Jul 2021
White paper 設計準確且多功能的鋰離子 電池測試解決方案 10 Nov 2020
Technical article How to design one battery tester for a wide range of sizes, voltages and form factors 04 Nov 2020
White paper Designing an Accurate, Multifunction Lithium-Ion Battery-Testing Solution 24 Sep 2020
Application note Difference Between an Instrumentation Amplifier and a Current Sense Amplifier 03 Apr 2020
User guide Universal Instrumentation Amplifier EVM: Alternate Pinout User's Guide 07 Feb 2020
Analog design journal Precision signal conditioning for safety-enabled AIMs in factory automation 30 Sep 2019
Technical article What is an instrumentation amplifier? 09 Aug 2019
Analog design journal Precision signal-conditioning solutions for motor control with position feedback 14 Jun 2019
Application note Comprehensive Error Calculation for Instrumentation Amplifiers 26 Mar 2019
Application note Simplify Voltage and Current Measurement in Battery Test Equipment 16 Oct 2017
Technical article How to layout a PCB for an instrumentation amplifier 14 Oct 2016
User guide Universal Instrumentation Amplifier EVM User’s Guide (Rev. B) 09 Aug 2016
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013
Analog design journal Getting the most out of your instrumentation amplifier design 10 Oct 2005

Design & development

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Package Pins Download
SOIC (D) 8 View options
SON (DRG) 8 View options
VSSOP (DGK) 8 View options

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