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DAC8742H
  • DAC8742H
  • DAC8742H

DAC8742H

ACTIVE

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

Texas Instruments DAC8742H Product Info

1 April 2026 6

Parameters

Interface type

SPI, 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

Package

TQFP (PBS)-32-49 mm² 7 x 7

Features

  • HART-Compliant Physical Layer Modem
    • 1200/2200 Hz HART FSK Sinusoids
    • Register Programmable Amplitude of TX Signals
      (DAC8741H / DAC8742H 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 uA 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
    • DAC8742H: UART and SPI
  • Reliability: CRC Bit Error Checking, Watchdog Timer
  • Wide Operating Temperature: –55°C to 125°C
  • 5 mm x 5 mm TQFP Package
  • HART-Compliant Physical Layer Modem
    • 1200/2200 Hz HART FSK Sinusoids
    • Register Programmable Amplitude of TX Signals
      (DAC8741H / DAC8742H 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 uA 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
    • DAC8742H: UART and SPI
  • Reliability: CRC Bit Error Checking, Watchdog Timer
  • Wide Operating Temperature: –55°C to 125°C
  • 5 mm x 5 mm TQFP Package

Description

The DAC8742H is a HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compatible low power modem designed for industrial process control and industrial automation applications.

In HART mode, the DAC8742H 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 DAC8742H 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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