DAC161P997
- 16-Bit Linearity
- Single-Wire Interface (SWIF), with Handshake
- Digital Data Transmission (No Loss of Fidelity)
- Pin Programmable Power-Up Condition
- Self Adjusting to Input Data Rate
- Loop Error Detection and Rreporting
- Programmable Output Current Error Level
- No External Precision Components
- Simple Interface to HART Modulator
- Small Package: WQFN-16 (4 × 4 mm, 0.5 mm Pitch)
- Key
- Output Current TempCo: 29 ppmFS/°C (Max)
- Long-Term Output Current Drift: 90 ppmFS (Typ)
- INL: 3.3/–2.1 µA(Max)
- Total Supply Current: 190 µA (Max)
Application
- Two-Wire, 4-20 mA Current Loop Transmitter
- Industrial Process Control
- Actuator Control
- Factory Automation
- Building Automation
- Precision Instruments
- Data Acquisition Systems
- Test Systems
All trademarks are the property of their respective owners.
The DAC161P997 is a 16-bit ΣΔ digital-to-analog converter (DAC) for transmitting an analog output current over an industry standard 4-20 mA current loop. It offers 16-bit accuracy with a low output current temperature coefficient (29 ppm/°C) and excellent long-term output current drift (90 ppmFS) while consuming less than 190 µA.
The data link to the DAC161P997 is a Single Wire Interface (SWIF) which allows sensor data to be transferred in digital format over an isolation boundary using a single isolation component. The DAC161P997’s digital input is compatible with standard isolation transformers and opto-couplers. Error detection and handshaking features within the SWIF protocol ensure error free communication across the isolation boundary. For applications where isolation is not required, the DAC161P997 interfaces directly to a microcontroller.
The loop drive of the DAC161P997 interfaces to a HART (Highway Addressable Remote Transducer) modulator, allowing injection of FSK modulated digital data into the 4-20 mA current loop. This combination of specifications and features makes the DAC161P997 ideal for 2- and 4-wire industrial transmitters.
The DAC161P997 is available in a 16-lead WQFN package and is specified over the extended industrial temperature range of –40°C to 105°C.
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 | DAC161P997 Single-Wire 16-bit DAC for 4- to 20-mA Loops datasheet (Rev. G) | PDF | HTML | 2014/12/24 | ||
| Circuit design | Circuit Replacing HART® Modem Device Competitors With the DAC8740H | PDF | HTML | 2026/1/29 | |||
| 應用說明 | A Basic Guide to the HART Protocol | PDF | HTML | 2023/11/9 | |||
| 應用說明 | AN-2245 MSP430 Interface to DAC161P997 Code Library (Rev. A) | 2013/4/22 |
設計與開發
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TIDA-00189 — 隔離迴路供電熱電偶發送器參考設計
隔離迴路供電熱電偶發送器參考設計是一款系統解決方案，為 4 至 20mA 隔離式電流迴路應用提供精密的 K 型熱電偶量測。此設計旨在作為評估模組，供使用者快速建立原型，並開發用於製程控制和工廠自動化的終端產品。作為溫度感測器的熱電偶潛在挑戰包括微小的電壓輸出、低靈敏度和非線性；此外，由於在工業環境中，接地電位差高於 100V 的現象十分常見，因此熱電偶與訊號調節電路必須進行電氣隔離。設計檔案包括設計考量、方塊圖、電路圖、物料清單 (BOM)、層圖、Altium 檔案、Gerber 檔案和 MSP430 韌體。
立即觀看 TIDA-00349 概述影片，其中涵蓋了與 TIDA-00189 (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RGH) | 16 | 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。