Texas Instruments' DAC8740H and DAC8742H are HART, FOUNDATION Fieldbus, and PROFIBUS PA-compatible low power modems for industrial process control and industrial automation applications.

In HART mode, the DAC874xH integrates all 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 the required circuitry to operate as half-duplex FOUNDATION Fieldbus-compatible H1 controllers and medium attachment units (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 serial peripheral interface (SPI). The SPI includes an SDO pin for daisy-chain support, various interrupts, and other extended features.