National Semiconductor introduced a 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. 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 µA 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 degrees C to 125 degrees C extended industrial temperature range.
Key Features of the DAC161P997
Low power operation: 190 µA enables total system power consumption below 30 mW or 3.5 mA
User programmable start up conditions and data rate auto detect: allows system configuration for trade-off between update-rate vs. power consumption
Error detection and reporting: multiple error conditions detected automatically, providing higher system reliability
Offered in a 16-pin, 4 mm by 4 mm LLP package, the DAC161P997 is available now and priced at $4 in 1,000-unit quantities.
