National Semiconductor offers low-power, 16-bit digital-to-analogue converter
National Semiconductor
DAC161P997
National Semiconductor has introduced the DAC161P997, a 16-bit digital-to-analogue converter (DAC) with a single-wire interface and 4–20mA current loop drive that is claimed to simplify the design of smart transmitters used in industrial two-wire sensor systems.
The DAC161P997 is designed to reduce component count and cost in factory and building automation control systems through enabling the use of a single isolation component to cross the isolation boundary.
In sensing and detecting applications where galvanic isolation is not required, the digital-to-analogue converter can interface directly with a microcontroller.
The delta-sigma DAC offers 16-bit accuracy with a minimal temperature coefficient of 29ppm and long-term output current drift of 90ppm, while consuming less than 190uA of supply current.
Key features
- 16-pin, 4 x 4mm LLP package
- Single-wire interface enables higher system accuracy compared with discrete PWM implementations
- Low-power operation — 190uA enables total system power consumption of less than 30mW or 3.5mA
- User-programmable start-up conditions and data-rate auto detect
- Loop drive interfaces to a highway addressable remote transducer (HART) modulator
- Error detection and reporting
- Operating temperature range: -40 to 125°C
- Priced at $4 in 1,000-unit quantities
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