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.