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INA821

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高带宽 (4.7MHz)、低噪声 (7nV/√Hz)、精密 (35μV)、低功耗仪表放大器

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INA821

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产品详情

Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 4.5 Input offset (±) (max) (µV) 35 Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 7 Features Overvoltage protection, Small Size, Super-beta CMRR (min) (dB) 136 Input offset drift (±) (max) (µV/°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 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.0015 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 to 10 Hz (typ) (µVPP) 0.14
Number of channels 1 Vs (max) (V) 36 Vs (min) (V) 4.5 Input offset (±) (max) (µV) 35 Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 7 Features Overvoltage protection, Small Size, Super-beta CMRR (min) (dB) 136 Input offset drift (±) (max) (µV/°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 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.0015 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 to 10 Hz (typ) (µVPP) 0.14
SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) VSSOP (DGK) 8 14.7 mm² (3 mm × 4.9 mm) WSON (DRG) 8 9 mm² (3 mm × 3 mm)
  • 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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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 INA821 35-µV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier 数据表 (Rev. D) PDF | HTML 2020-6-15
应用手册 输入偏置电流回路在仪表放大器应用中的重要性 PDF | HTML 英语版 PDF | HTML 2022-4-22
应用简报 简化电池测试设备中的电压和电流测量 (Rev. A) PDF | HTML 英语版 (Rev.A) PDF | HTML 2022-4-14
应用简报 仪表放大器和电流检测放大器的区别 英语版 2021-9-10
白皮书 设计一份精确的多功能锂离子电池测试解决方案 英语版 2020-11-10
技术文章 How to design one battery tester for a wide range of sizes, voltages and form fact PDF | HTML 2020-11-4
用户指南 Universal Instrumentation Amplifier EVM: Alternate Pinout User's Guide 2020-2-7
模拟设计期刊 Precision signal conditioning for safety-enabled AIMs in factory automation 2019-9-30
技术文章 What is an instrumentation amplifier? PDF | HTML 2019-8-9
模拟设计期刊 Precision signal-conditioning solutions for motor control with position feedback 2019-6-14
应用简报 Comprehensive Error Calculation for Instrumentation Amplifiers 2019-3-26
模拟设计期刊 使您的仪器放大器设计达到最佳效果 英语版 2006-7-13

设计与开发

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评估板

INA826EVM — INA826 评估模块

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

用户指南: PDF
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评估板

INAEVM-ALT-SO8 — 采用 SO-8 (D) 封装、具有备选引脚排列的仪表放大器评估模块

INAEVM-ALT-SO8 是具有备选引脚排列的仪器放大器评估模块 (EVM)，用于简化采用在用户指南中所示引脚 SO-8 (D) 封装的精密仪表放大器的原型制作。该 EVM 是一款未组装的电路板，因此仪表放大器器件样本需要单独订购。

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仿真模型

INA821 PSpice Model (Rev. B)

SBOMAQ6B.ZIP (24 KB) - PSpice 模型
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仿真模型

INA821 TINA-TI Reference Design (Rev. A)

SBOMAQ4A.TSC (1644 KB) - TINA-TI 参考设计
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仿真模型

INA821 TINA-TI Spice Model (Rev. A)

SBOMAQ5A.ZIP (11 KB) - TINA-TI Spice 模型
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计算工具

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

模拟工程师计算器旨在加快模拟电路设计工程师经常运用的许多重复性计算。该基于 PC 的工具提供图形界面，其中显示各种常见计算列表，从使用反馈电阻器设置运算放大器增益到选择合适的电路设计元件，以稳定模数转换器 (ADC) 驱动器缓冲器电路。

除了可用作独立工具之外，该计算器还能很好地与模拟工程师口袋参考中所述的概念配合使用。

支持的产品和硬件
封装 引脚 CAD 符号、封装和 3D 模型
SOIC (D) 8 Ultra Librarian
VSSOP (DGK) 8 Ultra Librarian
WSON (DRG) 8 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

订购和质量

支持和培训

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如果您对质量、包装或订购 TI 产品有疑问，请参阅 TI 支持。​​​​​​​​​​​​​​

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