16-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive


Product details


Resolution (Bits) 16 Number of DAC channels (#) 1 Interface type SPI Output type Buffered Current Features 4-20mA loop transmitter, Low Power Reference type Ext Architecture Delta-Sigma Rating Catalog Output range (Max) (mA/V) 24 Output range (Min) (mA/V) 0 Operating temperature range (C) -40 to 105 open-in-new Find other Precision DACs (<=10MSPS)

Package | Pins | Size

WQFN (RGH) 16 16 mm² 4 x 4 open-in-new Find other Precision DACs (<=10MSPS)


  • 16-Bit Resolution
  • Very-Low Supply Current of 100 µA
  • 5 ppmFS/°C Gain Error
  • Pin-Programmable Power-Up Condition
  • Loop-Error Detection and Reporting
  • Programmable Output-Current Error Levels
  • Simple HART Modulator Interfacing
  • Highly Integrated Feature Set in Small
    Footprint WQFN-16 (4- × 4-mm,
    0.5-mm Pitch)
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The DAC161S997 is a very low power 16-bit ΣΔ digital-to-analog converter (DAC) for transmitting an analog output current over an industry standard 4-20 mA current loop. The DAC161S997 has a simple 4-wire SPI for data transfer and configuration of the DAC functions. To reduce power and component count in compact loop-powered applications, the DAC161S997 contains an internal ultra-low power voltage reference and an internal oscillator. The low power consumption of the DAC161S997 results in additional current being available for the remaining portion of the system. The loop drive of the DAC161S997 interfaces to a Highway Addressable Remote Transducer (HART) modulator, allowing injection of FSK modulated digital data into the 4-20 mA current loop. This combination of specifications and features makes the DAC161S997 ideal for 2- and 4-wire industrial transmitters. The DAC161S997 is available in a 16-pin 4-mm × 4-mm WQFN package and is specified over the extended industrial temperature range of –40°C to +105°C.

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Technical documentation

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Type Title Date
* Data sheet DAC161S997 16-Bit SPI-Programmable DAC for 4-20 mA Loops datasheet (Rev. A) Dec. 29, 2014
Application note Loop powered 4- to 20-mA transmitter circuit Dec. 20, 2018
Technical article Powering smart sensor transmitters in industrial applications May 02, 2016
User guide DAC161S997EVM User's Guide (Rev. A) Feb. 29, 2016

Design & development

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Hardware development

document-generic User guide

DAC161S997EVM helps evaluate the DAC161S997, 4-20mA Loop driver with SPI interface. This board is designed as a 2-Wire loop-powered transmitter. It has a MSP430G2553 MCU which comes preloaded with a firmware which communicates with PC Software and can read/write DAC register according to the user (...)

  • 2-Wire Loop-powered configuration along with MCU helps prototyping remote sensor transmitter
  • Isolated USB interface to PC
  • Can be used with PC software or as a Standalone tranmitter
  • Hardware confirgurable Error o/p current
  • JTAG and GPIO header of MSP430

Software development

SLAC782.ZIP (156 KB)

Design tools & simulation

SNAM145.TSC (306 KB) - TINA-TI Reference Design
SNAM146.ZIP (19 KB) - TINA-TI Spice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)

Reference designs

参考设计 Download
RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems
TIDA-00095 This comprehensive design provides a complete system that measures and processes temperature signals  inputs from 2-wire, 3-wire, and 4-wire resistance temperature detectors (RTDs) and outputs a 4 to 20-mA current-loop signal corresponding to the temperature processed from the RTD inputs. It is (...)
document-generic Schematic document-generic User guide
参考设计 Download
Field Transmitter with BLE Connectivity Powered from 4 to 20-mA Current Loop Reference Design
TIDA-00666 — The TIDA-00666 TI Design enables Bluetooth Low Energy (BLE) communication powered from a 2-wire 4- to 20-mA loop. For industrial process control instruments, analog 4- to 20-mA current loops are commonly used for analog signaling, with 4 mA representing the lowest end of the range and 20 mA the (...)
document-generic Schematic document-generic User guide
参考设计 Download
Dual Sensor Measurement Using Single Current-Loop with FSK Modulation Reference Design
TIDA-00483 The TIDA-00483 reference design demonstrates a 4-20mA current loop subsystem capable of measuring the surrounding environment and communicating the temperature, humidity, and ambient light over the loop. The small footprint of the design contains all sensors, filters, and control circuitry to (...)
document-generic Schematic document-generic User guide
参考设计 Download
4-20mA Current Loop Transmitter Reference Design
TIDA-00648 The TIDA-00648 TI Design is an industry standard 4-20 mA current loop transmitter. It also allows injection of FSK modulated digital data into the 4-20 mA current loop for HART communication. External protection circuitry is deployed in-place for compliance with regulatory IEC61000-4 standards (...)
document-generic Schematic document-generic User guide
参考设计 Download
Small Form Factor, 2-Wire 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design
TIDA-00165 This is a reference design for a robust, low power, precise and long-term stable 2-wire loop powered 4 to 20mA current output temperature transmitter. It uses RTD temperature sensor with 4 to 20mA current loop transmitter. It also explains sensor signal conditioning, ratiometric measurement (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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WQFN (RGH) 16 View options

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