National DAC161P997 Features Single-Wire Current Loop Drive

Published:2011/10/27 0:48:00 Author:Amy From:SeekIC

The DAC161P997 from National Semiconductor is a 16- bit ∑Δ digital-to-analog converter (DAC). It is used for analog output current transmitting over an industry standard 4-20 mA current loop. With a low output current temperature coefficient (29ppm/°C) and excellent long-term output current drift (90 ppmFS), it offers 16-bit accuracy while consuming less than 190µA.

The data related to the DAC161P997 is a Single Wire Interface (SWIF) enabling sensor data to be transferred in digital format over an isolation boundary when a single isolation component is used. The DAC161P997’s digital input is compatible with standard isolation transformers and optocouplers. Error detection and handshaking features within the SWIF protocol ensure error free communication across the isolation boundary. In the applications of no isolation required, the DAC161P997 interfaces directly to a microcontroller.

The loop drive of the DAC161P997 interfaces to a HART (Highway Addressable Remote Transducer) modulator, which allows injection of FSK modulated digital data into the 4-20mA current loop. This combination of specifications and features makes the DAC161P997 suitable for 2- and 4-wire industrial transmitters.

The DAC161P997 is available in a 16-pin, 4 mm by 4 mm LLP package, and the industrial temperature range is extended from -40°C to 105°C.

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