AFE881H1
- Functional Safety-Capable
- Low quiescent current: 180 µA (typical)
- HART-compliant physical layer modem
- 16-bit or 14-bit monotonic high-performance DAC
- 1.8-V supply: 0.15 V to 1.25 V, 0.2 V to 1.0 V
- 5-V supply: 0.3 V to 2.5 V, 0.4 V to 2.0 V
- 4-LSB INL at 16 bits
- 0.07% FSR (max) TUE from –40°C to +125°C
- 12-bit 3.84-kSPS ADC for advanced diagnostics
- Integrated 1.25-V reference at 10 ppm/°C (max)
- Internal 1.2288-MHz oscillator with clock output
- Digital interface
- Serial peripheral interface (SPI): Shared bus for both DAC and HART
- Universal asynchronous receiver-transmitter (UART): Shared bus for both DAC and HART
- Both: SPI for DAC and UART for HART
- Fault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADC
- Digital DAC slew-rate control
- Wide operating temperature: –55°C to +125°C
The 16-bit AFE881H1 and 14-bit AFE781H1 ( AFEx81H1) are highly-integrated, high-accuracy, extremely low-power digital-to-analog converters (DACs) with voltage outputs designed for HART-enabled sensor-transmitter applications.
The AFEx81H1 devices include most of the components required to design a 4‑mA to 20‑mA, 2‑wire (loop-powered) sensor transmitter. In addition to the highly accurate DAC, these parts include a HART-certified FSK modem, 10‑ppm/°C voltage reference, and diagnostic analog-to-digital converter (ADC). To accommodate intrinsic and functional safety concerns, external voltage-to-current conversion and power regulation are required.
The internal diagnostic ADC is multiplexed to several internal nodes that enable an automatic self-health check. If any fault is detected from the diagnostic ADC, CRC frame-error checking, or windowed watchdog timer, the devices can optionally issue an interrupt, enter a fail-safe state corresponding to a standard NAMUR output value or user-specified custom value, or both.
These devices operate from supplies as low as 1.71 V with 220 µA maximum quiescent current. The devices are specified over the temperature range of –40°C to +125°C, but are functional from –55°C to +125°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 | AFEx81H1 16-Bit and 14-Bit, Low-Power DACs With Internal HART® Modem, Voltage Reference, and Diagnostic ADC for 4-mA to 20-mA Loop-Powered Applications datasheet | PDF | HTML | 2023/3/15 | ||
| 應用說明 | A Simple, Java-Based CRC Calculator | PDF | HTML | 2026/3/4 | |||
| 應用說明 | HART-Enabled Transmitter Based on an Evaluation Module Design | PDF | HTML | 2025/3/26 | |||
| 應用說明 | Design and Test of a HART-Enabled Field Transmitter for 4-20mA Loops | PDF | HTML | 2024/10/17 | |||
| 應用說明 | A Basic Guide to the HART Protocol | PDF | HTML | 2023/11/9 | |||
| Application brief | Ultra-Low-Power, Low-Voltage, 2-Wire, 4- to 20-mA Loop Transmitter Using AFE881H | PDF | HTML | 2023/3/3 | |||
| 證書 | AFE881H1EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) | 2023/2/9 | ||||
| 功能安全資訊 | AFE881H1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2022/9/23 |
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)。
AFE881H1EVM — 適用具 DAC、ADC 和 HART® 數據機的 16 位元低功耗 AFE 之 AFE881H1 評估模組
AFE881H1 評估模組 (EVM) 是評估 AFE881H1 的平台，此裝置為高度整合、高準確度、超低功耗的 16 位元數位轉類比轉換器 (DAC)，且具專為支援 HART® 感測器發射器應用所設計的電壓輸出。
AFE881H1 也配備循環冗餘檢查 (CRC) 故障偵測功能，以及適用進階診斷的 12 位元 1-kSPS 類比轉數位轉換器 (ADC)。
USB2ANY 介面工具 (另售) 將 GUI 與 AFE88H1EVM 結合，使用時必須具備此工具。
AFE88XH1-FELC-EVM — AFE88xH1 前端迴路電流 (FELC) 評估模組
AFE88XH1-FELC 評估模組 (EVM) 實作 4-20mA 介面，適用於 2 線迴路供電感測器。此 EVM 可在具有 1.8V 訊號鏈的低功耗、應用類環境中評估 AFE881H1 和 AFE882H1。AFE881H1 和 AFE882H1 整合了高精密度 16 位元 DAC 和 HART® 數據機。
AFE881H1EVM-GUI — AFE881H1EVM GUI installer
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-010982 — 現場傳送器平台，4mA 至 20mA 迴路供電介面參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| UQFN (RRU) | 24 | 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。