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運算放大器 (op amps)
高速運算放大器 (GBW ≥ 50 MHz)

OPA2891

現行

具有超低總諧波失真 (THD) 的雙通道 180MHz 0.95nV√Hz 運算放大器

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產品規格表

OPA2891

現行
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產品詳細資料

Architecture Voltage FB Number of channels 2 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 9 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 GBW (typ) (MHz) 180 BW at Acl (MHz) 180 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 105 Vn at flatband (typ) (nV√Hz) 0.95 Vn at 1 kHz (typ) (nV√Hz) 1 Iq per channel (typ) (mA) 7.5 Vos (offset voltage at 25°C) (max) (mV) 1 Rail-to-rail No Rating Catalog Operating temperature range (°C) -40 to 85 CMRR (typ) (dB) 106 Input bias current (max) (pA) 20000000 Offset drift (typ) (µV/°C) 1 Iout (typ) (mA) 200 2nd harmonic (dBc) 91 3rd harmonic (dBc) 91 Frequency of harmonic distortion measurement (MHz) 1
Architecture Voltage FB Number of channels 2 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 9 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 GBW (typ) (MHz) 180 BW at Acl (MHz) 180 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 105 Vn at flatband (typ) (nV√Hz) 0.95 Vn at 1 kHz (typ) (nV√Hz) 1 Iq per channel (typ) (mA) 7.5 Vos (offset voltage at 25°C) (max) (mV) 1 Rail-to-rail No Rating Catalog Operating temperature range (°C) -40 to 85 CMRR (typ) (dB) 106 Input bias current (max) (pA) 20000000 Offset drift (typ) (µV/°C) 1 Iout (typ) (mA) 200 2nd harmonic (dBc) 91 3rd harmonic (dBc) 91 Frequency of harmonic distortion measurement (MHz) 1
HVSSOP (DGN) 8 14.7 mm² (3 mm × 4.9 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm)
  • Ultra-low 0.95nV/√Hz voltage noise
  • High speed:
    • 180MHz unity gain bandwidth
    • 140MHz bandwidth at a gain of 2V/V (–1V/V)
    • 105V/µs slew rate
  • Very low distortion
    • THD = –91dBc (f = 1MHz, RL = 150Ω)
    • THD = –100dBc (f = 1MHz, RL = 1kΩ)
    • THD+N = –137dBc (f = 1kHz, BW = 80kHz)
  • Low 0.2mV (typical) and 1mV (maximum) input offset voltage at 25°C
  • 200mA output current drive (typical)
  • Typical operation from ±4.5V to ±18V
  • Offset nulling pins on the OPA891
  • Ultra-low 0.95nV/√Hz voltage noise
  • High speed:
    • 180MHz unity gain bandwidth
    • 140MHz bandwidth at a gain of 2V/V (–1V/V)
    • 105V/µs slew rate
  • Very low distortion
    • THD = –91dBc (f = 1MHz, RL = 150Ω)
    • THD = –100dBc (f = 1MHz, RL = 1kΩ)
    • THD+N = –137dBc (f = 1kHz, BW = 80kHz)
  • Low 0.2mV (typical) and 1mV (maximum) input offset voltage at 25°C
  • 200mA output current drive (typical)
  • Typical operation from ±4.5V to ±18V
  • Offset nulling pins on the OPA891

The OPA891 and OPA2891 (OPAx891) are ultra-low voltage noise, high-speed voltage feedback amplifiers that are an excellent choice for applications requiring low voltage noise, including communications and imaging. The single-amplifier OPA891 and the dual-amplifier OPA2891 offer very good ac performance with 140MHz bandwidth, gain (G) = 2V/V, 105V/µs slew rate, and 70ns settling time (0.1%). The OPAx891 are unity-gain stable with 180MHz bandwidth. These amplifiers have a high drive capability of 200mA and draw only 7.5mA supply current per channel. With –100dBc of total harmonic distortion (THD) at f = 1MHz and a very low noise of 0.95nV/√Hz, the OPAx891 are designed for applications requiring low distortion and low noise such as buffering analog-to-digital converters.

The OPA891 and OPA2891 (OPAx891) are ultra-low voltage noise, high-speed voltage feedback amplifiers that are an excellent choice for applications requiring low voltage noise, including communications and imaging. The single-amplifier OPA891 and the dual-amplifier OPA2891 offer very good ac performance with 140MHz bandwidth, gain (G) = 2V/V, 105V/µs slew rate, and 70ns settling time (0.1%). The OPAx891 are unity-gain stable with 180MHz bandwidth. These amplifiers have a high drive capability of 200mA and draw only 7.5mA supply current per channel. With –100dBc of total harmonic distortion (THD) at f = 1MHz and a very low noise of 0.95nV/√Hz, the OPAx891 are designed for applications requiring low distortion and low noise such as buffering analog-to-digital converters.
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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 OPAx891 180MHz, 0.95nV/√Hz, Ultra-Low THD Operational Amplifiers datasheet (Rev. B) PDF | HTML 2024/7/23

設計與開發

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開發板

DEM-OPA-MSOP-2A — 適用於 MSOP-8 封裝的二路運算放大器評估模組

The DEM-OPA-MSOP-2A demonstration fixture helps designers evaluate the operation and performance of TI's dual, high speed, wideband operational amplifiers. This unpopulated PC board is compatible with products offered in the 8-lead MSOP (DGK) package.
 
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開發板

DEM-OPA-SO-2A — 適用於 SO-8 封裝的二路運算放大器評估模組

The DEM-OPA-SO-2A demonstration evaluation module helps designers evaluate the operation and performance of TI dual-channel, high-speed, wideband operational amplifiers. This unpopulated printed-circuit board (PCB) is compatible with products offered in the 8-lead SOIC (D) package.

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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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SOIC (D) 8 Ultra Librarian
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