OPA838
- Gain bandwidth product: 300MHz
- Very-low (trimmed) supply current: 950µA
- Bandwidth: 90MHz (AV = 6V/V)
- High full-power bandwidth: 45MHz, 4VPP
- Negative rail input, rail-to-rail output
- Single-supply operating range: 2.7V to 5.4V
- 25°C input offset: ±125µV (maximum)
- Input offset voltage drift: < ±1.6µV/°C (maximum)
- Input voltage noise: 1.8nV/√Hz (> 200Hz)
- Input current noise: 1pA/√Hz (> 2000Hz)
- < 1µA shutdown current for power savings
The OPA838 decompensated voltage-feedback operational amplifier provides a high, 300MHz gain bandwidth product with 1.8nV/√Hz input noise voltage, requiring only a trimmed 0.95mA supply current. These features combine to provide an extremely power-efficient device for photodiode transimpedance designs and high-voltage gain stages, which require the lowest input voltage noise in signal receiver applications.
Operating at the minimum recommended noninverting gain of 6V/V results in a 90MHz, –3dB bandwidth. Extremely low input noise and offset voltage make the OPA838 an excellent choice for high gains. Even at a dc-coupled gain of 1000V/V, a 300kHz signal bandwidth is available with a maximum output offset voltage of ±125mV.
The single-channel OPA838 is available in 6-pin SOT-23, 6-pin SC70, and 8-pin X2QFN packages, all with a power shutdown feature. The OPA838 is also available in a 5-pin SC70 package.
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 | OPA838 1mA, 300MHz Gain Bandwidth, Voltage-Feedback Op Amp datasheet (Rev. E) | PDF | HTML | 2025/8/6 | ||
| 技術文章 | 3 common questions when designing with high-speed amplifiers | PDF | HTML | 2020/7/17 | |||
| Application brief | Higher accuracy using an external amplifier in ultrasonic flow measurement | 2019/2/5 |
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)。
OPA838DBVEVM — 適用於 DBV 封裝的 OPA838 評估模組
OPA838DCKEVM — 適用於 DCK 封裝的 OPA838 評估模組
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。
TIDM-02003 — 用於氣流測量的超音波感測子系統參考設計
TIDM-02005 — 適用於水流量測的最佳化超音波感測計量學參考設計
此參考設計協助設計人員使用整合式超音波感測解決方案 (USS) 模組,開發成本最佳化的超音波水計量子系統,以低功耗與最大整合度提供優異的量測性能。此設計以 64KB MSP430FR6043 微控制器 (MCU) 為基礎,搭載整合式高速、ADC 架構、訊號擷取及整合式低功耗加速器 (LEA) ,可將數位訊號處理最佳化。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
| SOT-SC70 (DCK) | 5 | Ultra Librarian |
| X2QFN (DXB) | 8 | Ultra Librarian |
| SOT-SC70 (DCK) | 6 | Ultra Librarian |