ADS8684
- 16-Bit ADC with Integrated Analog Front-End
- 4-, 8-Channel MUX with Auto and Manual Scan
- Channel-Independent Programmable Input Ranges:
- Bipolar: ±10.24 V, ±5.12 V, and ±2.56 V
- Unipolar: 10.24 V, 5.12 V
- 5-V Analog Supply: 1.65-V to 5-V I/O Supply
- Constant Resistive Input Impedance: 1 MΩ
- Input Overvoltage Protection: Up to ±20 V
- On-Chip, 4.096-V Reference with Low Drift
- Excellent Performance:
- 500-kSPS Aggregate Throughput
- DNL: ±0.5 LSB; INL: ±0.75 LSB
- Low Drift for Gain Error and Offset
- SNR: 92 dB; THD: –102 dB
- Low Power: 65 mW
- AUX Input → Direct Connection to ADC Inputs
- SPI™-Compatible Interface with Daisy-Chain
- –40°C to 125°C Industrial Temperature Range
- TSSOP-38 Package (9.7 mm × 4.4 mm)
The ADS8684 and ADS8688 are 4- and 8-channel, integrated data acquisition systems based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096-V reference with low temperature drift. Operating on a single 5-V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high dc precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1-MΩ constant resistive input impedance irrespective of the selected input range.
The ADS8684 and ADS8688 offer a simple SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.
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 | ADS868x 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges datasheet (Rev. C) | PDF | HTML | 2015/4/21 | ||
| Application brief | Precision ADCs in Servo Drives (Rev. A) | PDF | HTML | 2025/10/29 | |||
| Circuit design | High common-mode differential input voltage to ±10-V ADC input circuit (Rev. A) | PDF | HTML | 2024/9/24 | |||
| Circuit design | Input Protection for High-Voltage ADC Circuit with TVS Diode (Rev. A) | PDF | HTML | 2023/5/2 | |||
| 應用說明 | Circuit for detecting input floating on ADS8681 ADC | PDF | HTML | 2021/3/31 | |||
| 應用說明 | Reducing Phase Delay by Averaging on ADS8686S with Burst Sequencer Mode | PDF | HTML | 2021/1/11 | |||
| 應用說明 | Extending Input Voltage Range and Understanding Associated Errors for ADC With I | 2018/11/9 | ||||
| 白皮書 | Voltage-reference impact on total harmonic distortion | 2016/8/1 | ||||
| 電子書 | Best of Baker's Best: Precision Data Converters -- SAR ADCs | 2015/5/21 | ||||
| 使用指南 | Phase-Compensated 8-Ch Multiplexed Data Acquisition System for Power Automation (Rev. B) | 2015/3/12 |
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)。
ADS8688EVM-PDK — ADS8688 16 位元、500-kSPS、8 通道、單電源供電、SAR ADC EVM 性能示範套件 (PDK)
評估套件內含 ADS8688 評估板、精密主機介面 (PHI) 控制器電路板，以及隨附的電腦軟體，可讓使用者透過通用序列匯流排 (USB) 與 ADC 通訊、擷取資料，以及執行資料分析。
ADS8688SW-LINUX — ADS8688 Linux® 驅動程式
The Linux driver supports the ADS868x 16-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges. The Linux driver supports communication through the SPI bus and interfaces with the IIO sub-system.
Linux Mainline Status
Available in Linux Main line: Yes
Available through (...)
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。
ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.
TIDA-00310 — 適用於智慧電網 IED 的類比輸入、輸出和繼電器驅動器輸出模組參考設計
此參考設計展示適合智慧電網裝置的彈性類比 IO 解決方案，例如需和其他電網裝置通訊的保護繼電器與 RTU，並使用 5V 至 10V DC 電壓或 4 至 20 mA 電流的類比 IO。此解決方案可實現兩種類型的 IO，以及電源數位繼電器驅動。此模組提供 SPI 和 I2C 通訊介面，用於與處理器通訊。
TIPD167 — 適用於電力自動化應用的相位補償八通道多工資料採集系統參考設計
此 TI 驗證設計提供適用於電源自動化的相位補償 8 通道多工資料擷取系統的理論、元件選擇、TINA-TI 模擬、驗證與測量性能，以及 Altium 電路圖與 PCB 佈局。 該設計使用具備整合式類比前端電路的 16 位元、8 通道、500ksps SAR ADC ADS8688，以簡化系統硬體設計。
此設計介紹相位與相位補償的概念，比較非同步取樣 ADC 與同步取樣 ADC 在輸入通道間所引入的額外相位延遲差異，並提供最佳演算法以補償非同步實作中所引入的相位延遲。
測量結果展示了此設計中使用的相位補償演算法如何補償由多工 ADC 引進的額外相位延遲，與同步取樣 ADC (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (DBT) | 38 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。