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INA821

現行

高頻寬 (4.7MHz)、低雜訊 (7nV/√Hz)、精密 (35μV)、低功耗、儀器放大器

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產品規格表

INA821

現行
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產品詳細資料

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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技術文件

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 INA821 35-µV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier datasheet (Rev. D) PDF | HTML 2020/6/15
Application brief Simplify Voltage and Current Measurement in Battery Test Equipment (Rev. A) PDF | HTML 2022/3/10
應用說明 Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML 2021/7/27
白皮書 設計準確且多功能的鋰離子 電池測試解決方案 Download English Version 2020/11/10
技術文章 How to design one battery tester for a wide range of sizes, voltages and form fact PDF | HTML 2020/11/4
Application brief Difference Between an Instrumentation Amplifier and a Current Sense Amplifier 2020/4/3
使用指南 Universal Instrumentation Amplifier EVM: Alternate Pinout User's Guide 2020/2/7
類比設計期刊 Precision signal conditioning for safety-enabled AIMs in factory automation 2019/9/30
技術文章 What is an instrumentation amplifier? PDF | HTML 2019/8/9
類比設計期刊 Precision signal-conditioning solutions for motor control with position feedback 2019/6/14
Application brief Comprehensive Error Calculation for Instrumentation Amplifiers 2019/3/26
類比設計期刊 Getting the most out of your instrumentation amplifier design 2005/10/10

設計與開發

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開發板

INA826EVM — INA826 評估模組

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

使用指南: PDF
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開發板

INAEVM-ALT-SO8 — 採用 SO-8 (D) 封裝之具有替代針腳的儀器放大器的評估模組

INAEVM-ALT-SO8 是具有替代針腳配置的儀器放大器評估模組 (EVM)，可用於簡化 SO-8 (D) 封裝的精密儀器放大器原型設計，針腳配置如使用指南所示。EVM 為未組裝的空板，因此儀器放大器裝置樣品需單獨訂購。

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模擬型號

INA821 PSpice Model (Rev. B)

SBOMAQ6B.ZIP (24 KB) - PSpice 模型
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模擬型號

INA821 TINA-TI Reference Design (Rev. A)

SBOMAQ4A.TSC (1644 KB) - TINA-TI 參考設計
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模擬型號

INA821 TINA-TI Spice Model (Rev. A)

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

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

類比工程師的計算機旨在加速類比電路設計工程師定期使用的許多重複計算。此基於 PC 的工具提供圖形介面，列出各種常見計算，從使用回饋電阻器設定運算放大器增益到選擇適當的電路設計元件以穩定類比數位轉換器 (ADC) 驅動緩衝電路。

除了作為獨立工具使用外，此計算機還與類比工程師口袋參考中描述的概念相得益彰。

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOIC (D) 8 Ultra Librarian
VSSOP (DGK) 8 Ultra Librarian
WSON (DRG) 8 Ultra Librarian
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