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

Qty Price
1-9 $3.71
10-24 $3.34
25-99 $3.11
100-249 $2.73
250-499 $2.56
500-749 $2.17
750-999 $1.83
1000+ $1.75


  • 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)


  • 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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Texas Instruments  DAC161P997CISQX/NOPB

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.