Product details

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 x 4
  • 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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Technical documentation

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Type Title Date
* Data sheet DAC874xH HART® and FOUNDATION Fieldbus™ and PROFIBUS PA Modems datasheet (Rev. D) PDF | HTML 02 May 2019
Application note Design and Test of a HART-Enabled Field Transmitter for 4-20mA Loops PDF | HTML 17 Oct 2024
Application note A Basic Guide to the HART Protocol PDF | HTML 09 Nov 2023
Application brief Designing Foundation Fieldbus and Profibus PA Devices with the DAC874xh Modem Fa 04 Mar 2019
Application brief Implementing HART in PLC Analog Input Modules for Real-Time Communication 05 Nov 2018
Application brief Implementing HART in 2-Wire Field Sensor-Transmitters 03 Oct 2018
EVM User's guide DAC8742H Evaluation Module User's Guide (Rev. A) 14 Nov 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

DAC8742HEVM — DAC8742H evaluation module

The DAC8742H evaluation module (EVM) is an easy-to-use platform for evaluating the functionality and performance of the DAC8742H device. The DAC8740H, DAC8741H, and DAC8742H are HART®, FOUNDATION Fieldbus™, and PROFIBUS PA-compliant low-power modems designed for industrial (...)

User guide: PDF
Code example or demo

SBAC218 DAC8741H/DAC8742H Register Map Header File

Supported products & hardware

Supported products & hardware

Products
Precision DACs (≤10 MSPS)
DAC8741H HART®, FOUNDATION Fieldbus™, and PROFIBUS PA-compliant modem with SPI interface DAC8742H HART®, FOUNDATION Fieldbus™ and PROFIBUS PA-compliant modem with UART/SPI
Simulation model

DAC874XH IBIS Model

SBAM332.ZIP (86 KB) - IBIS Model
Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RGE) 24 Ultra Librarian

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Information included:
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