DAC161P997 Datasheet | National Semiconductor

Description The DAC161P997 is a 16- bit ∑Δ digital-to-analog converter (DAC) for transmitting an analog output current over an industry standard 4-20 m A current loop. It offers 16-bit accuracy with a low output current temperature coefficient (29ppm/°C) and excellent long-term output current drift (90 ppm FS) while consuming less than 190µA. The data link to the DAC161P997 is a Single Wire Interface (SWIF) which allows sensor data to be transferred in digital format over an isolation boundary using a single isolation ponent. The DAC161P997’s digital input is patible with standard isolation transformers and optocouplers. Error detection and handshaking features within the SWIF protocol ensure error free munication across the isolation boundary. For applications where isolation is not required, the DAC161P997 interfaces directly to a microcontroller. The loop drive of the DAC161P997 interfaces to a HART (Highway Addressable Remote Transducer) modulator, allowing injection of FSK modulated digital data into the 4-20m A current loop. This bination of specifications and features makes the DAC161P997 ideal for 2- and 4-wire industrial transmitters. The DAC161P997 is available in a 16- lead LLP package and is specified over the extended industrial temperature range of -40°C to 105°C. 2.0 Applications - Two-wire, 4-20 m A current loop transmitter - Industrial Process Control - Actuator control - Factory Automation - Building Automation - Precision Instruments - Data Acquisition Systems - Test Systems 3.0 Features - 16-bit linearity - Single-Wire Interface (SWIF), with handshake - Digital Data transmission (no loss of fidelity) - Pin Programmable Power-Up Condition - Self adjusting to input data rate - Loop error detection and reporting - Programmable output current error level - No external precision ponents - Simple interface to HART modulator - Small package: LLP-16 (4x4 mm, 0.5 mm pitch) 4.0 Key Specifications - Output Current Temp Cohttp://..net/ - Long-Term Output...