22 March 2017
Power Electronics / Power Management
Texas Instruments introduced a digital-to-analog converter (DAC) that combines industry-leading precision performance with simpler power supply design. The 16-bit 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.
The four-channel device 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. Engineers designing these systems face the challenge of managing power dissipation in a small form factor. By combining a 4-20 mA current and voltage driver with a precision reference and a buck/boost converter, the DAC8775 enables a small total system footprint.
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. 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.
A total unadjusted error of 0,1% full-scale range (FSR) over an extended industrial temperature range of -40°C 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. 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.
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