1 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 Rreporting
• Programmable Output Current Error Level
• No External Precision Components
• Simple Interface to HART Modulator
• Small Package: WQFN-16 (4 x 4 mm, 0.5 mm
Pitch)
• Key Specifications
– 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)

2 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

3 Description
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.