Single-Wire 16-Bit DAC for 4-to-20mA Loops in Smart Transmitters

The DAC161P997 16-bit Accurate Delta-Sigma DAC Allows Single Isolator Data Transmission

National Semiconductor (now part of Texas Instruments) has released a new 16-bit digital-to-analog converter (DAC) featuring a single-wire interface and 4-to-20 mA current loop drive that simplifies the design of smart transmitters used in industrial two-wire sensor systems. The highly integrated DAC161P997 reduces component count and cost in factory and building automation control systems by enabling the use of a single isolation component to cross the isolation boundary. For sensing and detecting applications where galvanic isolation is not required, National's DAC161P997 interfaces directly to a microcontroller.

National Semiconductor has released a new 16-bit digital-to-analog converter (DAC) featuring a single-wire interface and 4-to-20 mA current loop drive that simplifies the design of smart transmitters used in industrial two-wire sensor systems. The highly integrated DAC161P997 reduces component count and cost in factory and building automation control systems by enabling the use of a single isolation component to cross the isolation boundary. For sensing and detecting applications where galvanic isolation is not required, National’s DAC161P997 interfaces directly to a microcontroller.

The low-power DAC161P997 provides system designers an exceptional balance of accuracy, ease of use, performance and system cost. Its delta-sigma DAC offers 16-bit accuracy with a minimal temperature coefficient of 29 ppm and long-term output current drift of 90 ppm, while consuming less than 190 uA of supply current. The DAC161P997’s loop drive interfaces to a highway addressable remote transducer (HART) modulator, allowing injection of FSK-modulated digital data into the 4-to-20 mA current loop. The DAC operates over the -40°C to 105° extended industrial temperature range.

Features of the DAC161P997 Single-Wire 16-bit DAC

For more information on the National Semiconductor DAC161P997 Single-Wire 16-bit DAC, visit the TI website at TI DAC161P997 product page

The Texas Instruments website address is www.ti.com
[Reprinted with kind permission from National Semiconductor]