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.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | DAC161S997 16-Bit SPI-Programmable DAC for 4-20 mA Loops datasheet (Rev. A) | PDF | HTML | Dec 29, 2014 |
| Circuit design | Circuit Replacing HART® Modem Device Competitors With the DAC8740H | PDF | HTML | Jan 29, 2026 | |
| Circuit design | Loop-Powered 4mA to 20mA Transmitter Circuit (Rev. A) | PDF | HTML | Sep 19, 2024 | |
| Analog design Journal | Designing 4mA to 20mA loop-powered transmitters | PDF | HTML | May 28, 2024 | |
| Analog design Journal | How to use an ideal diode controller as a scalable input bypass switch in solar applications | PDF | HTML | May 28, 2024 | |
| Application note | A Basic Guide to the HART Protocol | PDF | HTML | Nov 9, 2023 | |
| Technical article | Powering smart sensor transmitters in industrial applications | PDF | HTML | May 2, 2016 |
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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 (...)
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 (...)
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 (...)
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 (...)
TIDA-00648 is an industry standard 4-20 mA current-loop transmitter. It 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 such as EFT, ESD and (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RGH) | 16 | Ultra Librarian |
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