OPA2991
- Low offset voltage: ±125 µV
- Low offset voltage drift: ±0.3 µV/°C
- Low noise: 10.8 nV/√Hz at 1 kHz
- High common-mode rejection: 130 dB
- Low bias current: ±10 pA
- Rail-to-rail input and output
- Wide bandwidth: 4.5 MHz GBW
- High slew rate: 21 V/µs
- High capacitive load drive: 1 nF
- MUX-friendly/comparator inputs
- Amplifier operates with differential inputs up to supply rail
- Amplifier can be used in open-loop or as comparator
- Low quiescent current: 560 µA per amplifier
- Wide supply: ±1.35 V to ±20 V, 2.7 V to 40 V
- Robust EMIRR performance: EMI/RFI filters on input and supply pins
- Differential and common-mode input voltage range to supply rail
The OPAx991 family (OPA991, OPA2991, and OPA4991) is a family of high voltage (40 V) general purpose operational amplifiers. These devices offer exceptional DC precision and AC performance, including rail-to-rail input/output, low offset (±125 µV, typical), low offset drift (±0.3 µV/°C, typical), low noise (10.5 nV/√Hz and 1.8 µVPP), and 4.5-MHz bandwidth.
Unique features such as differential and common-mode input-voltage range to the supply rail, high output current (±75 mA), high slew rate (21 V/µs), high capacitive load drive (1 nF), and shutdown functionality make the OPAx991 a robust, high-performance operational amplifier for high-voltage industrial applications.
The OPAx991 family of op amps is available in micro-size packages (such as X2QFN and WSON), as well as standard packages (such as SOT-23, SOIC, and TSSOP), and is specified from –40°C to 125°C.
技術文件
| 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 | OPAx991 40-V Rail-to-Rail Input/Output, Low Offset Voltage, Low Noise Op Amp datasheet (Rev. F) | PDF | HTML | 2022/1/4 | ||
| 應用說明 | Full Power Bandwidth and Op Amp Distortion | PDF | HTML | 2026/5/14 | |||
| Circuit design | AC-Coupled Transimpedance Amplifier Circuit (Rev. A) | PDF | HTML | 2025/1/27 | |||
| 應用說明 | Ramping Up on Slew Rate (Rev. A) | PDF | HTML | 2024/9/25 | |||
| 應用說明 | DC Parameters: Input Offset Voltage (VOS) (Rev. B) | PDF | HTML | 2023/3/31 | |||
| Application brief | Using An Op Amp for High-Side Current Sensing (Rev. A) | PDF | HTML | 2021/12/7 | |||
| 類比設計期刊 | Optimizing input and output transient settling times in amplifier circuits | PDF | HTML | 2021/11/18 | |||
| Circuit design | Voltage-to-current (V-I) converter circuit with a Darlington transistor | PDF | HTML | 2021/5/14 | |||
| Third party document | Programmable analog output circuit maximizes industrial system flexibility | 2021/2/1 | ||||
| 類比設計期刊 | Second-sourcing options for small-package amplifiers | 2018/3/26 |
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)。
AMP-PDK-EVM — 放大器性能開發套件評估模組
放大器性能開發套件 (PDK) 是一款評估模組 (EVM) 套件，可測試通用運算放大器 (op amp) 參數，並與大多數運算放大器和比較器相容。EVM 套件提供主板和多個插槽式子卡選項，可滿足封裝需求，使工程師能夠快速評估和驗證裝置性能。
AMP-PDK-EVM 套件支援五種最熱門的業界標準封裝，包括：
- D (SOIC-8 和 SOIC-14)
- PW (TSSOP-14)
- DGK (VSSOP-8)
- DBV (SOT23-5 和 SOT23-6)
- DCK (SC70-5 和 SC70-6)
Collection of test circuits in TINA-TI to accompany AN1516 (Rev. A)
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。
CIRCUIT060041 — AC 耦合轉阻放大器電路
CIRCUIT060047 — 具有達靈頓對電路的高壓側 V-I
TIDA-011026 — 現場發射器平台：三線 4mA 至 20mA 介面參考設計
此參考設計提供 3 線制電壓和電流介面感測器的 4-20mA 介面實作範例。此設計可評估 XTR200 和電流迴路保護器 TPS2661。XTR200 整合了電壓和電流現場發射器通訊介面的輸出驅動電路，支援標準工業訊號電平，如 4-20mA、0-20mA 及 0-10V。此參考設計透過針腳接頭提供對脈衝寬度調變 (PWM) 介面的存取，此介面用於驅動輸出級。此針腳接頭也提供 3.3V 電源來為連接的微控制器供電。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
| SOT-23-THN (DDF) | 8 | Ultra Librarian |
| WSON (DSG) | 8 | Ultra Librarian |
| SOIC (D) | 8 | Ultra Librarian |
| X2QFN (RUG) | 10 | Ultra Librarian |
| TSSOP (PW) | 8 | Ultra Librarian |