PGA855
- Eight pin-programmable binary gains
- G (V/V) = ⅛, ¼, ½, 1, 2, 4, 8, and 16
- Low gain error drift: 1 ppm/°C (max) at G = 1 V/V
- Fully differential outputs
- Independent output power-supply pins to allow for ADC input overdrive protection
- Output common-mode control
- Faster signal processing:
- Wide bandwidth: 10 MHz at all gains
- High slew rate: 35 V/µs
- Settling time: 500 ns to 0.01%, 950 ns to 0.0015%
- Input stage noise: 7.8 nV/√ Hz at G = 16 V/V
- Filter option to achieve better SNR
- Input overvoltage protection to ±40 V beyond supplies
- Input-stage supply range:
- Single supply: 8 V to 36 V
- Dual supply: ±4 V to ±18 V
- Output-stage supply range:
- Single supply: 4.5 V to 36 V
- Dual supply: ±2.25 V to ±18 V
- Specified temperature range: –40°C to +125°C
- Small package: 3-mm × 3-mm VQFN
The PGA855 is a high-bandwidth programmable gain instrumentation amplifier with fully differential outputs. The PGA855 is equipped with eight binary gain settings, from an attenuating gain of 0.125 V/V to a maximum of 16 V/V, using three digital gain selection pins. The output common-mode voltage can be independently set using the VOCM pin.
The PGA855 architecture is optimized to drive inputs of high-resolution, precision analog-to-digital converters (ADCs) with sampling rates up to 1 MSPS without the need for an additional ADC driver. The output-stage power supplies (LVSS/LVDD) are decoupled from the input stage and can be connected to power supplies of the ADC to protect the ADC or downstream device 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 0.3 pA/√ Hz, making the PGA855 a versatile choice for virtually any sensor type. The low-noise current-feedback front-end architecture offers excellent gain flatness, even at high frequencies, making the PGA855 an excellent high-impedance sensor readout device. Integrated protection circuitry on the input pins handles overvoltages up to ±40 V 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 | PGA855 Low-Noise, Wide-Bandwidth, Fully Differential Output Programmable-Gain Instrumentation Amplifier datasheet (Rev. B) | PDF | HTML | 2023/9/27 | ||
| 應用說明 | Anti-Alias Filter Design for a 100kHz Bandwidth Data Acquisition Signal Chain (Rev. A) | PDF | HTML | 2025/2/27 | |||
| Application brief | Using TI ADCs for Noise, Vibration, and Harshness Measurements | PDF | HTML | 2024/12/3 | |||
| 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 | |||
| Product overview | PLC Analog Input Front-End Architectures | PDF | HTML | 2022/7/31 |
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)。
PGA85X-INPUT-OUTPUT-RANGE-DESIGN-CALC — PGA85x input and output range design calculator
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。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |