OPA838

現行

1mA、300MHz 增益頻寬,電壓回饋運算放大器

產品詳細資料

Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.4 GBW (typ) (MHz) 300 BW at Acl (MHz) 90 Acl, min spec gain (V/V) 6 Slew rate (typ) (V/µs) 350 Vn at flatband (typ) (nV√Hz) 1.8 Vn at 1 kHz (typ) (nV√Hz) 1.8 Iq per channel (typ) (mA) 0.96 Vos (offset voltage at 25°C) (max) (mV) 0.125 Rail-to-rail In to V-, Out Features Decompensated, Shutdown Rating Catalog Operating temperature range (°C) -40 to 125 CMRR (typ) (dB) 105 Input bias current (max) (pA) 4400000 Offset drift (typ) (µV/°C) 0.4 Iout (typ) (mA) 20 2nd harmonic (dBc) -110 3rd harmonic (dBc) -120 Frequency of harmonic distortion measurement (MHz) 1
Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.4 GBW (typ) (MHz) 300 BW at Acl (MHz) 90 Acl, min spec gain (V/V) 6 Slew rate (typ) (V/µs) 350 Vn at flatband (typ) (nV√Hz) 1.8 Vn at 1 kHz (typ) (nV√Hz) 1.8 Iq per channel (typ) (mA) 0.96 Vos (offset voltage at 25°C) (max) (mV) 0.125 Rail-to-rail In to V-, Out Features Decompensated, Shutdown Rating Catalog Operating temperature range (°C) -40 to 125 CMRR (typ) (dB) 105 Input bias current (max) (pA) 4400000 Offset drift (typ) (µV/°C) 0.4 Iout (typ) (mA) 20 2nd harmonic (dBc) -110 3rd harmonic (dBc) -120 Frequency of harmonic distortion measurement (MHz) 1
SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 mm) SOT-SC70 (DCK) 5 4.2 mm² (2 mm × 2.1 mm) X2QFN (DXB) 8 1.68 mm² (1.4 mm × 1.2 mm) SOT-SC70 (DCK) 6 4.2 mm² (2 mm × 2.1 mm)
  • 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
  • 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.

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.

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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 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

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開發板

OPA838DBVEVM — 適用於 DBV 封裝的 OPA838 評估模組

OPA838DBVEVM 是一款採用 DBV (SOT23-6) 封裝的評估模組,適用於單通道 OPA838 放大器。此評估模組可快速且輕鬆展示放大器的功能性和多元用途。EVM 隨時可透過板載連接器來連接電源、訊號源和測試儀器。EVM 已配置為可透過其輸入與輸出,輕鬆連接常見的 50-Ω 實驗室設備。
使用指南: PDF
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開發板

OPA838DCKEVM — 適用於 DCK 封裝的 OPA838 評估模組

OPA838DCKEVM 是一款採用 DCK (SC70-5) 封裝的評估模組,適用於單通道 OPA838 放大器。此評估模組可快速且輕鬆展示放大器的功能性和多元用途。EVM 隨時可透過板載連接器來連接電源、訊號源和測試儀器。EVM 已配置為可透過其輸入與輸出,輕鬆連接常見的 50-Ω 實驗室設備。
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模擬型號

OPA838 PSpice Model

SBOMBQ1.ZIP (185 KB) - PSpice 模型
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模擬型號

OPA838 TINA-TI Reference Design (Rev. A)

SBOMAE7A.TSC (51 KB) - TINA-TI 參考設計
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模擬型號

OPA838 TINA-TI Spice Model (Rev. A)

SBOMAE6A.ZIP (14 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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參考設計

TIDM-02003 — 用於氣流測量的超音波感測子系統參考設計

此參考設計協助設計人員開發超音波瓦斯計量子系統,採用整合式超音波感測解決方案 (USS) 模組,具備卓越的計量性能、低功耗及高整合度。此設計以 64KB MSP430FR6043 微控制器 (MCU) 為基礎,具備整合式高速、ADC 型訊號擷取,以及整合式低功耗加速器 (LEA) ,可將數位訊號處理最佳化。
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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。

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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

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