DAC8741H

ACTIVO

Módem compatible con HART®, FOUNDATION Fieldbus™ y PROFIBUS PA con interfaz SPI

Detalles del producto

Interface type SPI 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 SPI 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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos DAC874xH HART® and FOUNDATION Fieldbus™ and PROFIBUS PA Modems datasheet (Rev. D) PDF | HTML 2/05/2019
Nota sobre la aplicación A Simple, Java-Based CRC Calculator PDF | HTML 4/03/2026
Circuit design Circuit Replacing HART® Modem Device Competitors With the DAC8740H PDF | HTML 29/01/2026
Nota sobre la aplicación HART-Enabled Transmitter Based on an Evaluation Module Design PDF | HTML 26/03/2025
Nota sobre la aplicación Design and Test of a HART-Enabled Field Transmitter for 4-20mA Loops PDF | HTML 17/10/2024
Nota sobre la aplicación A Basic Guide to the HART Protocol PDF | HTML 9/11/2023
Application brief Designing Foundation Fieldbus and Profibus PA Devices with the DAC874xh Modem Fa 4/03/2019
Application brief Implementing HART in PLC Analog Input Modules for Real-Time Communication 5/11/2018
Application brief Implementing HART in 2-Wire Field Sensor-Transmitters 3/10/2018

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

DAC8742HEVM — Módulo de evaluación DAC8742H

El módulo de evaluación (EVM) DAC8742H es una plataforma fácil de usar para evaluar la funcionalidad y el rendimiento del dispositivo DAC8742H. Los DAC8740H, DAC8741H y DAC8742H son módems de baja potencia compatibles con HART®, FOUNDATION Fieldbus™ y PROFIBUS PA diseñados para aplicaciones de (...)

Guía del usuario: PDF
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Ejemplo de código o demostración

SBAC218 — DAC8741H/DAC8742H Register Map Header File

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Modelo de simulación

DAC874XH IBIS Model

SBAM332.ZIP (86 KB) - Modelo IBIS
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Herramienta de diseño

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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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Soporte y capacitación

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