DAC161P997 - Single-Wire 16-bit DAC for 4-20mA Loops

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

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 component. The DAC161P997’s digital input is compatible with standard isolation transformers and opto-couplers. Error detection and handshaking features within the SWIF protocol ensure error free communication 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 4-20 mA current loop. This combination of specifications and features makes the DAC161P997 ideal for 2- and 4-wire industrial transmitters.

The DAC161P997 is available in a 16-lead WQFN package and is specified over the extended industrial temperature range of –40°C to 105°C.

Products containing the "DAC161P997" keyword are: DAC161P997CISQ , DAC161P997CISQ/NO , DAC161P997CISQ/NOP , DAC161P997CISQ/NOPB , DAC161P997CISQ/NOPB , DAC161P997CISQNOPB , DAC161P997CISQX , DAC161P997CISQX/NOPB , DAC161P997CISQXNOPB , DAC161P997EVAL/NOPB , DAC161P997TDA1 , DAC161P997TDA2 , DAC161P997TDA2

• 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 Rreporting
• Programmable Output Current Error Level
• No External Precision Components
• Simple Interface to HART Modulator
• Small Package: WQFN-16 (4 × 4 mm, 0.5 mm Pitch)
• Key
  • Output Current TempCo: 29 ppmFS/°C (Max)
  • Long-Term Output Current Drift: 90 ppmFS (Typ)
  • INL: 3.3/–2.1 µA(Max)
  • Total Supply Current: 190 µA (Max)

Application

• Two-Wire, 4-20 mA Current Loop Transmitter
• Industrial Process Control
• Actuator Control
• Factory Automation
• Building Automation
• Precision Instruments
• Data Acquisition Systems
• Test Systems

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