Single-wire 16-bit DAC for 4-to-20-mA loops simplifies smart transmitter design
For sensing and detecting applications where galvanic isolation is not required, National’s DAC161P997 interfaces directly to a microcontroller.
The low-power DAC161P997 claims to provide 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 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 to 125 degrees C extended industrial temperature range.
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.
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