PGA849
- Differential to single-ended conversion
- Eight pin-programmable binary gains
- G (V/V) = ⅛, ¼, ½, 1, 2, 4, 8, and 16
- Low gain error drift: ±2ppm/°C (maximum)
- Faster signal processing:
- Wide bandwidth: 10MHz at all gains
- High slew rate: 35V/µs at G ≥ ½ V/V
- Settling time: 700ns to 0.01%, 950ns to 0.0015%
- Input stage noise: 8.6nV/√Hz at G = 16V/V
- Filter option to achieve better SNR
- Input overvoltage protection to ±40V beyond supplies
- Input-stage supply range:
- Single supply: 8V to 36V
- Dual supply: ±4V to ±18V
- Independent output power-supply pins
- Output-stage supply range:
- Single supply: 4.5V to 36V
- Dual supply: ±2.25V to ±18V
- Specified temperature range: –40°C to +125°C
- Small package: 3mm × 3mm QFN
The PGA849 is a wide-bandwidth, low-noise programmable gain instrumentation amplifier for differential-to-single-ended conversion. The PGA849 is equipped with eight binary gain settings, from an attenuating gain of 0.125V/V to a maximum of 16V/V, using three digital gain selection pins.
The PGA849 architecture is optimized to drive inputs of high-resolution, precision analog-to-digital converters (ADCs) with sampling rates up to 1MSPS without the need for an additional ADC driver. The output-stage power supplies are decoupled from the input stage to protect the ADC or downstream devices against overdrive damage.
The super-beta input transistors offer an impressively low input bias current, which in turn provides a very low input current noise density of 0.3pA/√Hz, making the PGA849 a versatile choice for virtually any sensor type. The low-noise current-feedback front-end architecture offers exceptional gain flatness even at high frequencies, making the PGA849 an excellent high-impedance sensor readout device. Integrated protection circuitry on the input pins handles overvoltages of up to ±40V beyond the power-supply voltages.
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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 | PGA849 Low-Noise, Wide-Bandwidth, Precision Programmable Gain Instrumentation Amplifier datasheet (Rev. A) | PDF | HTML | 2024/12/12 | ||
| Product overview | PGA855 and PGA849 Product Overview (Rev. A) | PDF | HTML | 2024/7/11 | |||
| 應用說明 | Achieve High SNR with the PGA855, Fully Differential Programmable-Gain Amplifier | PDF | HTML | 2024/3/21 |
設計與開發
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PGA849-CALC — PGA849 輸入和輸出範圍計算機
TIDA-010945 — 整合式低漂移精密數位萬用表和資料擷取訊號鏈參考設計
此參考設計說明用於 DC 量測之高性能訊號鏈的理論、設計與測試。主要目標應用是數位萬用表 (DMM)，但此設計也適用於其他應用，例如資料擷取 (DAQ) 和狀況監控。此設計使用高性能 24 位元類比轉數位轉換器 ADS127L21，以及低雜訊可編程增益放大器 PGA855，並具備 ±2.4ppm 的典型非線性與低溫度致漂移，進而實現高 DC 準確度。這些裝置皆高度整合，可簡化整體訊號鏈設計。
TIDA-010962 — 自動測試設備 (ATE) 80V 離散式浮動 VI 參考設計
此參考設計展現四象限離散式浮動電壓與電流 (VI) 設計。電壓輸出支援 ±40V 和 0V 至 80V 範圍，並提供 500mA、10mA 和 10μA 三種電流範圍。此設計可在強制電壓 (FV)、強制電流 (FI)、緩衝器及具有類比回饋迴路的 Gang 模式下運作。憑藉 20 位元強制數位轉類比轉換器 (DAC) 和 18 位元、2 通道類比轉數位轉換器 (ADC) 以及精密訊號鏈，該參考設計可實現校準後控制與測量具備 0.01% 準確度。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |