DAC161S997RGHT

ADCs/DACs - Special Purpose Overview

The DAC161S997RGHT is a 16-bit Sigma-Delta digital-to-analog converter (DAC) manufactured by Texas Instruments, designed for 4-20 mA industrial current loop applications. It operates on a single supply voltage ranging from 2.7 V to 3.6 V and features a low power consumption of 100 µA. The device integrates an internal low-power voltage reference and oscillator, reducing external component requirements. Communication is handled via a standard 4-wire SPI interface. It supports HART protocol connectivity through a high-speed modulator interface, enabling FSK data injection into the current loop. The component is housed in a compact 16-pin WQFN package with dimensions of 4 mm x 4 mm.

ADCs/DACs - Special Purpose Feature Summary

• 16-bit resolution with integrated Sigma-Delta modulation for high precision
• Ultra-low power consumption of 100 µA supply current
• Internal low-power voltage reference and oscillator
• SPI interface for data transmission and configuration
• HART modem interface for digital data injection

ADCs/DACs - Special Purpose Applications

• Two-wire 4-20 mA current-loop transmitters
• Loop-powered industrial transmitters
• Industrial process control systems
• Actuator control applications

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'RGHT' against official Texas Instruments documentation to confirm tape-and-reel packaging and temperature grade specifications. Ensure compatibility with existing PCB footprints for the 16-WQFN package. Cross-reference ordering part numbers with authorized distributors to avoid counterfeit components. Confirm RoHS compliance status as per the latest manufacturing notices.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring precise analog output in loop-powered environments where power budget is critical. The 100 µA quiescent current allows sufficient headroom for other circuit elements in two-wire configurations. Verify that the SPI interface timing meets the microcontroller's capabilities. Consider the thermal performance of the exposed pad in the WQFN package for high ambient temperature operations up to 105°C.

ADCs/DACs - Special Purpose Part Context

The DAC161S997 series is part of Texas Instruments' portfolio of precision DACs tailored for industrial automation. It complements other devices like the DAC161P997, which offers single-wire interface options. This specific model focuses on SPI-based control while maintaining compatibility with HART communication standards, making it suitable for modern smart field instruments.

ADCs/DACs - Special Purpose Replacement Considerations

The DAC161P997 serves as a functional alternative if single-wire interface (SWI) is preferred over SPI. For general-purpose 16-bit loop-driven DACs, the AD5421 from Analog Devices may be considered, though pinouts and interfaces differ. Verify electrical parameters and software compatibility before substitution.