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Precision DACs (≤10 MSPS)

DAC8740H

ACTIVE

HART®, FOUNDATION Fieldbus™, and PROFIBUS PA-compliant modem with UART interface

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Data sheet

DAC8740H

ACTIVE
Data sheet Order now

Product details

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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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet DAC874xH HART® and FOUNDATION Fieldbus™ and PROFIBUS PA Modems datasheet (Rev. D) PDF | HTML May 2, 2019
Circuit design Circuit Replacing HART® Modem Device Competitors With the DAC8740H PDF | HTML Jan 29, 2026
Application note HART-Enabled Transmitter Based on an Evaluation Module Design PDF | HTML Mar 26, 2025
Application note Design and Test of a HART-Enabled Field Transmitter for 4-20mA Loops PDF | HTML Oct 17, 2024
Product overview How to Connect Multiple Field Devices for Hart Communication PDF | HTML Mar 20, 2024
Application note A Basic Guide to the HART Protocol PDF | HTML Nov 9, 2023
Application brief Designing Foundation Fieldbus and Profibus PA Devices with the DAC874xh Modem Fa Mar 4, 2019
Application brief Implementing HART in PLC Analog Input Modules for Real-Time Communication Nov 5, 2018
Application brief Implementing HART in 2-Wire Field Sensor-Transmitters Oct 3, 2018
Technical article How to HART-enable your analog input module PDF | HTML Apr 2, 2018
Technical article Improve your field transmitter designs with HART PDF | HTML Feb 22, 2018
Technical article Back to the basics: what is HART protocol and how does it work? PDF | HTML Jan 26, 2018

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
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Simulation model

DAC874XH IBIS Model

SBAM332.ZIP (86 KB) - IBIS model
Supported products & hardware
Design tool

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.
Supported products & hardware
Reference design

TIDA-01504 — Highly-Accurate, Loop-Powered, 4mA to 20mA Field Transmitter With HART® Modem Reference Design

This reference design provides a solution for a loop-powered, highly-accurate, field (sensor) transmitter with a HART® modem. The design uses a partially-discrete 4-mA to 20-mA current transmitter, HART modem, microcontroller, and power conditioning blocks in realizing a smart field (...)

Supported products & hardware
Reference design

TIDA-060020 — HART-enabled PLC analog input module reference design

This reference design is a single-channel, 4-mA to 20-mA analog input module that supports the highway addressable remote transducer (HART) communication protocol, enabling bidirectional digital communication between field transmitters and programmable logic controllers (PLCs). The loop current, (...)
Supported products & hardware
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VQFN (RGE) 24 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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