National Semiconductor has introduced a 16-bit digital-to-analog converter (DAC) featuring a single-wire interface and 4–20 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, the device interfaces directly to a microcontroller.
The low-power DAC161P997’s 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 chip’s loop drive interfaces to a highway addressable remote transducer (HART) modulator, allowing injection of FSK-modulated digital data into the 4–20 mA current loop. The DAC operates over the -40°C to 105°C extended industrial temperature range.
User programmable startup conditions and data rate auto detect allow system configuration for trade-off between update rate and power consumption. High system reliability is provided by the automatic detection and reporting of multiple error conditions.
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