INA821

ACTIVE

High bandwidth (4.7MHz), low noise (7nV/√Hz), precision (35μV), low-power, instrumentation amp

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Product details

Parameters

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)) 65 CMRR (Min) (dB) 92 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 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 2.5 Gain non-linearity (+/-) (Max) (%) 0.0015 open-in-new Find other Instrumentation amplifiers

Package | Pins | Size

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 open-in-new Find other Instrumentation amplifiers

Features

  • 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

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Description

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

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

Design & development

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

Hardware development

EVALUATION BOARD Download
25
Description

The INA826EVM is intended to provide basic functional evaluation of the INA826.

Features
  • Intuitive evaluation with the silkscreen schematic
  • Easy access to nodes with surface-mount test points
  • Advanced evaluation with two prototype areas
  • Reference voltage source flexibility
  • Convenient input and output filtering
EVALUATION BOARD Download
25
Description
The universal INAEVM-ALT-SO8 (instrumentation amplifier evaluation module with alternate pin-out) is available to simplify prototyping precision instrumentation amplifiers in the SO-8 (D) package with the pinout shown.  See the chart below for compatible TI INA devices. Note: These boards are (...)
Features
  • Intuitive evaluation
  • Easy access to nodes with suface-mount test points
  • Reference voltage source flexibility
  • Convenient input and output filtering

Design tools & simulation

SIMULATION MODEL Download
SBOMAQ4A.TSC (1644 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SBOMAQ5A.ZIP (11 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SBOMAQ6A.ZIP (31 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL 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 (...)
CALCULATION TOOL 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 TOOL 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
Digital control reference design for cost-optimized battery test systems
TIDA-010086 — This reference design provides a cost-effective solution for battery formation and test applications. This design uses the C2000™ real-time control MCU for high-resolution pulse-width modulation (PWM) generation, and constant-current (CC) and constant-voltage (CV)
control loops. It efficiently (...)
document-generic Schematic

CAD/CAE symbols

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

Ordering & quality

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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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