16bit d/a converter simplifies smart transmitter design
National Semiconductor's new DAC161P997 16bit d/a converter features a single wire interface and 4 to 20mA current loop drive and is designed to simplify the design of smart transmitters used in industrial two wire sensor systems.
According to National, the converter 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, it interfaces directly to a microcontroller.
The device's delta sigma d/a converter offers 16bit accuracy with a minimal temperature coefficient of 29ppm and long term output current drift of 90ppm, while consuming less than 190uA of supply current. The DAC161P997's loop drive interfaces to a highway addressable remote transducer modulator, allowing injection of FSK modulated digital data into the 4 to 20mA current loop.
