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數據轉換器
數位轉類比轉換器 (DAC)
精密 DAC (≤10 MSPS)

DAC8740H

現行

具有 UART 介面的 HART®、FOUNDATION Fieldbus™ 和 PROFIBUS PA 相容數據機

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產品規格表

DAC8740H

現行
立即訂購

產品詳細資料

Interface type UART Reference type Ext, Int Rating Catalog Features FOUNDATION Fieldbus MAU, HART Modem, Low Power, Profibus PA Modem Operating temperature range (°C) -55 to 125 Product type Special-function DAC
Interface type UART Reference type Ext, Int Rating Catalog Features FOUNDATION Fieldbus MAU, HART Modem, Low Power, Profibus PA Modem Operating temperature range (°C) -55 to 125 Product type Special-function DAC
VQFN (RGE) 24 16 mm² (4 mm × 4 mm)
  • HART-compliant physical layer modem
    • 1200-Hz, 2200-Hz HART FSK sinusoids
    • Register programmable amplitude of TX signals (DAC8741H only)
    • Integrated RX demodulator and band-pass filter with minimal external components
  • FOUNDATION Fieldbus compatible H1 controller and medium attachment unit (MAU)
    • 31.25 kbit/s communication based on Manchester-coded bus powered (MBP)
    • Integrated Manchester encoder and decoder
    • Compatible with PROFIBUS PA
  • Low quiescent current: 180 µA max at typical industrial operating temperature range (–40°C to +85°C)
  • Integrated 1.5-V reference
  • Flexible clocking options
    • Internal oscillator
    • External crystal oscillator
    • External CMOS clock
  • Digital interface
    • DAC8740H: UART
    • DAC8741H: SPI
  • Reliability: CRC bit error checking, watchdog timer (DAC8741H only)
  • Wide operating temperature: –55°C to +125°C
  • 4-mm × 4-mm QFN package
  • HART-compliant physical layer modem
    • 1200-Hz, 2200-Hz HART FSK sinusoids
    • Register programmable amplitude of TX signals (DAC8741H only)
    • Integrated RX demodulator and band-pass filter with minimal external components
  • FOUNDATION Fieldbus compatible H1 controller and medium attachment unit (MAU)
    • 31.25 kbit/s communication based on Manchester-coded bus powered (MBP)
    • Integrated Manchester encoder and decoder
    • Compatible with PROFIBUS PA
  • Low quiescent current: 180 µA max at typical industrial operating temperature range (–40°C to +85°C)
  • Integrated 1.5-V reference
  • Flexible clocking options
    • Internal oscillator
    • External crystal oscillator
    • External CMOS clock
  • Digital interface
    • DAC8740H: UART
    • DAC8741H: SPI
  • Reliability: CRC bit error checking, watchdog timer (DAC8741H only)
  • Wide operating temperature: –55°C to +125°C
  • 4-mm × 4-mm QFN package

The DAC8740H and DAC8741H (DAC874xH) are HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compatible low-power modems designed for industrial process control and industrial-automation applications.

In HART mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex HART physical layer modems, in either slave or master configurations with minimal external components for filtering. In FOUNDATION Fieldbus mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex FOUNDATION Fieldbus compatible H1 controllers and MAUs.

The HART, FOUNDATION Fieldbus, or PROFIBUS PA, data stream can be transferred from the microcontroller through either a UART interface or an integrated FIFO accessed by a SPI interface. The SPI interface includes an SDO pin for daisy-chain support, various interrupts, and other extended features.

The DAC8740H and DAC8741H (DAC874xH) are HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compatible low-power modems designed for industrial process control and industrial-automation applications.

In HART mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex HART physical layer modems, in either slave or master configurations with minimal external components for filtering. In FOUNDATION Fieldbus mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex FOUNDATION Fieldbus compatible H1 controllers and MAUs.

The HART, FOUNDATION Fieldbus, or PROFIBUS PA, data stream can be transferred from the microcontroller through either a UART interface or an integrated FIFO accessed by a SPI interface. The SPI interface includes an SDO pin for daisy-chain support, various interrupts, and other extended features.
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DAC8742H 現行 具有 UART/SPI 介面的 HART®、FOUNDATION Fieldbus™ 和 PROFIBUS PA 相容數據機 More interfacing options, SPI and UART version

技術文件

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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 DAC874xH HART® and FOUNDATION Fieldbus™ and PROFIBUS PA Modems datasheet (Rev. D) PDF | HTML 2019/5/2
Circuit design Circuit Replacing HART® Modem Device Competitors With the DAC8740H PDF | HTML 2026/1/29
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
Product overview How to Connect Multiple Field Devices for Hart Communication PDF | HTML 2024/3/20
應用說明 A Basic Guide to the HART Protocol PDF | HTML 2023/11/9
Application brief Designing Foundation Fieldbus and Profibus PA Devices with the DAC874xh Modem Fa 2019/3/4
Application brief Implementing HART in PLC Analog Input Modules for Real-Time Communication 2018/11/5
Application brief Implementing HART in 2-Wire Field Sensor-Transmitters 2018/10/3
技術文章 How to HART-enable your analog input module PDF | HTML 2018/4/2
技術文章 Improve your field transmitter designs with HART PDF | HTML 2018/2/22
技術文章 Back to the basics: what is HART protocol and how does it work? PDF | HTML 2018/1/26

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)。

開發板

DAC8742HEVM — DAC8742H 評估模組

DAC8742H 評估模組 (EVM) 是一款易於使用的平台，用於評估 DAC8742H 裝置的功能與性能。DAC8740H、DAC8741H 和 DAC8742H 是符合 HART®、FOUNDATION Fieldbus™ 與 PROFIBUS PA 標準的低功耗數據機，專為工業製程控制與工業自動化應用設計。DAC8742HEVM 是一套完整的評估套件，包含 USB2ANY 與評估軟體，支援 Microsoft Windows® XP 及 Windows® 7/8/10 作業系統。

使用指南: PDF
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模擬型號

DAC874XH IBIS Model

SBAM332.ZIP (86 KB) - IBIS 模型
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設計工具

ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired reference voltage, and the tool will list up to two voltage reference recommendations.
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參考設計

TIDA-01504 — 配備 HART® 數據機的高準確度、迴路供電、4mA 至 20mA 現場傳送器參考設計

此參考設計為配備 HART® 數據機的迴路供電、高精度、現場（感測器）發射器提供解決方案。此設計採用部分離散式 4mA 至 20mA 電流傳送器、HART 數據機、微控制器和電源調節區塊，實現智慧現場傳送器設計。此設計符合 HART FSK 實體層規格，並已註冊至 FieldComm Group™。

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參考設計

TIDA-060020 — 啓用 HART 的 PLC 類比輸入模組參考設計

此參考設計為一個單通道、4-mA 至 20-mA 類比輸入模組，支援高速可尋址遠程轉換器 (HART) 通訊協定，可實現現場發射器與可編程邏輯控制器 (PLC) 之間的雙向數位通訊。代表主要變數的迴路電流會流經電流感測電阻器，產生成比例電壓，該電壓由精密 Δ-Σ 類比轉數位轉換器 (ADC) (ADS1260) 進行數位化。此設計中使用了 DAC8740H 數據機，以在整個電流迴路中實作 HART 通訊。ADS1260 和 DAC8740H 與一個外部微控制器介接，此控制器控制 ADS1260 取樣，並包含支援 HART 通訊協定的 HART (...)
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VQFN (RGE) 24 Ultra Librarian
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