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放大器
運算放大器 (op amps)
精密運算放大器 (Vos < 1mV)

OPA391

現行

具有高速度功率比的微功耗、單路、高精密度、低偏壓電流 RRIO 運算放大器

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產品規格表

OPA391

現行
產品規格表 立即訂購

產品詳細資料

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 1.7 Vos (offset voltage at 25°C) (max) (mV) 0.045 Offset drift (typ) (µV/°C) 1 Input bias current (max) (pA) 0.8 GBW (typ) (MHz) 1 Features e-Trim™ Slew rate (typ) (V/µs) 1 Rail-to-rail In, Out Iq per channel (typ) (mA) 0.0235 Vn at 1 kHz (typ) (nV√Hz) 60 CMRR (typ) (dB) 121 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.06 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) 0.1 Output swing headroom (to negative supply) (typ) (V) 0.003 Output swing headroom (to positive supply) (typ) (V) -0.003 THD + N at 1 kHz (typ) (%) 0.002
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 1.7 Vos (offset voltage at 25°C) (max) (mV) 0.045 Offset drift (typ) (µV/°C) 1 Input bias current (max) (pA) 0.8 GBW (typ) (MHz) 1 Features e-Trim™ Slew rate (typ) (V/µs) 1 Rail-to-rail In, Out Iq per channel (typ) (mA) 0.0235 Vn at 1 kHz (typ) (nV√Hz) 60 CMRR (typ) (dB) 121 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.06 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) 0.1 Output swing headroom (to negative supply) (typ) (V) 0.003 Output swing headroom (to positive supply) (typ) (V) -0.003 THD + N at 1 kHz (typ) (%) 0.002
SOT-SC70 (DCK) 5 4.2 mm² (2 mm × 2.1 mm)
  • Low IQ: 24µA
  • Gain bandwidth product: 1MHz
  • Low input bias current: 10fA
  • Low offset voltage: ±45µV (maximum)
  • Low drift: ±1.2µV/°C
  • Low supply voltage operation: 1.7V to 5.5V
  • Input common mode range ±100mV beyond rail
  • Fast slew rate: 1V/µs
  • High load capacitance drive
  • High output current drive: 60mA
  • Rail-to-rail output
  • EMI and RFI filtered inputs
  • Small package options: SC-70, DSBGA
  • Low IQ: 24µA
  • Gain bandwidth product: 1MHz
  • Low input bias current: 10fA
  • Low offset voltage: ±45µV (maximum)
  • Low drift: ±1.2µV/°C
  • Low supply voltage operation: 1.7V to 5.5V
  • Input common mode range ±100mV beyond rail
  • Fast slew rate: 1V/µs
  • High load capacitance drive
  • High output current drive: 60mA
  • Rail-to-rail output
  • EMI and RFI filtered inputs
  • Small package options: SC-70, DSBGA

The OPA391, OPA2391, and OPA4391 (OPAx391) devices feature a unique combination of high bandwidth (1MHz) along with very-low quiescent current (24µA) in high-precision amplifiers. These features combined with rail-to-rail input and output make these devices an exceptional choice in high-gain, low-power applications. Ultra-low input bias current of 10fA, only 45µV of offset (maximum), and 1.2µV/°C of drift over temperature help maintain high precision in ratiometric and amperometric sensor front ends that have demanding low-power requirements.

The OPAx391 use Texas Instruments’ proprietary e‑trim™ operational amplifier technology, enabling a unique combination of ultra-low offset and low input offset drift without the need for any input switching or auto-zero techniques. The CMOS-based technology platform also features a modern, robust output stage design that is tolerant of high output capacitance, alleviating stability problems that are common in typical low-power amplifiers.

The OPA391, OPA2391, and OPA4391 (OPAx391) devices feature a unique combination of high bandwidth (1MHz) along with very-low quiescent current (24µA) in high-precision amplifiers. These features combined with rail-to-rail input and output make these devices an exceptional choice in high-gain, low-power applications. Ultra-low input bias current of 10fA, only 45µV of offset (maximum), and 1.2µV/°C of drift over temperature help maintain high precision in ratiometric and amperometric sensor front ends that have demanding low-power requirements.

The OPAx391 use Texas Instruments’ proprietary e‑trim™ operational amplifier technology, enabling a unique combination of ultra-low offset and low input offset drift without the need for any input switching or auto-zero techniques. The CMOS-based technology platform also features a modern, robust output stage design that is tolerant of high output capacitance, alleviating stability problems that are common in typical low-power amplifiers.

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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 OPAx391 Precision, Ultra-Low IQ , Low Offset Voltage, e-trim™ Operational Amplifiers datasheet (Rev. E) PDF | HTML 2024/10/28
Application brief Offset Correction Methods: Laser Trim, e-Trim, and Chopper (Rev. D) PDF | HTML 2024/12/5
白皮書 Op Amp Offset Voltage and Bias Current Limitations PDF | HTML 2024/11/5
應用說明 Impact of Current Noise in CMOS and JFET Amplifiers PDF | HTML 2023/5/4
Application brief Ultra-Low-Power, Low-Voltage, 2-Wire, 4- to 20-mA Loop Transmitter Using AFE881H PDF | HTML 2023/3/3
Application brief How to Select Amplifiers for Pressure Transmitter Applications (Rev. B) PDF | HTML 2023/2/14
技術文章 Designing signal chains for portable diagnostics PDF | HTML 2022/5/18
應用說明 Amplifier Input Common-Mode and Output-Swing Limitations PDF | HTML 2022/1/14
技術文章 Do I need more slew rate or bandwidth in my high-speed, low-side current shunt mea PDF | HTML 2021/9/21
技術文章 Designing with low-power op amps, part 2: Low-power op amps for low-supply-voltage PDF | HTML 2021/3/24
技術文章 Designing with low-power op amps, part 1: Power-saving techniques for op-amp circu PDF | HTML 2021/2/2

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

DIP-ADAPTER-EVM — DIP 轉接器評估模組

Speed up your op amp prototyping and testing with the DIP-Adapter-EVM, which provides a fast, easy and inexpensive way to interface with small, surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them directly to existing circuits.

The (...)

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開發板

DIYAMP-EVM — 通用自製 (DIY) 放大器電路評估模組

DIYAMP-EVM 是一系列評估模組 (EVM)，提供工程師與自組愛好者 (DIYers) 實作型放大器電路，協助快速驗證設計概念並模擬結果。提供三種業界標準封裝（SC70、SOT-23 和 SOIC）與 12 種常見放大器配置，支援單電源與雙電源架構的放大器、濾波器、穩定補償與比較器應用。

DIYAMP-EVM 可快速製作電路原型，並採用常見的 0805 或 0603 表面裝載元件。透過多種組合方式，此 EVM 可建立從簡單放大器電路到複雜訊號鏈的各種評估電路。此 EVM 支援模擬板、超微型 A 版 (SMA)、接頭和有線介面連接方式，並與大多數類比數位轉換器 (ADC) (...)

使用指南: PDF | HTML
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模擬型號

OPAx391 PSpice Model (Rev. B)

SBOMBK1B.ZIP (28 KB) - PSpice 模型
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模擬型號

OPAx391 TINA-TI Reference Design (Rev. A)

SBOMBJ9A (333 KB) - TINA-TI 參考設計
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模擬型號

OPAx391 TINA-TI SPICE Model (Rev. A)

SBOMBK0A.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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計算工具

OPAMP-NOISECALC — Noise Calculator

This folder contains three tools to help in understandning and managing noise in cicuits. The included tools are:

  • A noise generator tool - This is a Lab View 4-Run Time executable that generates Gaussian white noise, uniform white noise, 1/f noise, short noise, and 60Hz line noise. Temporal data, (...)
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參考設計

TIDA-010982 — 現場傳送器平台，4mA 至 20mA 迴路供電介面參考設計

此參考設計提供 2 線迴路供電感測器的 4-20mA 介面實作範例。此設計可在具有 1.8V 訊號鏈的低功耗應用類環境中評估 AFE881H1 和 AFE882H1。AFE881H1 和 AFE882H1 整合了高精密度 16 位元數位轉類比轉換器 (DAC) 和 HART® 數據機。此參考設計在針腳接頭上提供序列週邊介面 (SPI) 和通用非同步接收器發射器 (UART) 介面，以連接至微控制器 (MCU)。此針腳接頭提供 3.3V 與 1.8V 電源供 MCU 使用，並具備 1.25V 參考電壓供類比轉數位轉換器 (ADC) 使用。
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封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOT-SC70 (DCK) 5 Ultra Librarian
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