The 16-bit digital-to-analog converter DAC8775 operates from a single, wide 12- to 36-V power rail, leveraging an integrated buck/boost converter to generate all of the required internal power supplies.
Devised by Texas Instruments, the four-channel DAC8775 addresses the trend in factory automation and process control equipment toward input/output (I/O) modules that must squeeze more channels into a smaller space. By combining a 4-20 mA current and voltage driver with a precision reference and a buck/boost converter, the DAC8775 enables a total system footprint that is up to 25% smaller than the nearest competing device. Expanding TI’s versatile portfolio of precision data converters, this highly integrated DAC can deliver smaller and more efficient designs with advanced diagnostic capabilities.
Key features and benefits of the DAC8775 data converter
• More reliable system design: The DAC8775 on-chip diagnostic features include smart alarms that monitor open load, short circuit, over-temperature, cyclic redundancy check (CRC), watchdog timer and compliance voltage. Designers can choose preset actions that help detect faults early to facilitate reliable system operation.
• Efficiency with fast response times: The device has an innovative auto-learn feature that calculates the load impedance on the 4-20 mA loop and clamps the power supply. This enables faster settling time, balancing efficiency with quicker system response.
• High dc performance: A total unadjusted error of 0.1% full-scale range (FSR) over an extended industrial temperature range of -40° to 125°C enables designers to rate their output modules for higher temperature ranges. The DAC8775’s high dc performance reduces the need for system calibration, saving manufacturing costs compared to a discrete solution.
• Thermally optimized design: The DAC8775 dynamically adjusts the generated supply based on the current load on the 4-20 mA loop. This creates an efficient system with well-controlled thermal performance, allowing more channels in a smaller space.
A four-channel analog output module reference design demonstrates the combination of the DAC8775 and the LM5166 high-efficiency synchronous buck converter that dissipates less than 1 W in factory-automation implementations. Additionally, an evaluation module is available for US$175 for designers to simulate and optimize the DAC8775.
The DAC8775 is available now through the TI store and authorized distributors. The device comes in a 10×10-mm quad-flat no-lead (QFN) package and is priced at US$15.72 in 1,000-unit quantities.
• Read a blog about how precision DACs enhance performance in analog output modules.
• Watch a video that summarizes the benefits of DAC8775.
• Explore the Precision DAC Learning Center.
• Search for answers and get help with your design in the TI E2E™ Community Precision Data Converters forum.