16-bit DAC Shrinks Space In Industrial Automation


Helping designers of industrial control applications shrink board space and design costs, Texas Instruments (TI) has unveiled a new highly-integrated 16-bit digital-to-analog converter (DAC) which operates from a single, wide 12- to 36-V power rail. Leveraging an integrated buck/boost converter, the DAC generates all of the required internal power supplies to save designers time, cost and significant board space, says TI.

The new four-channel DAC8775 combines a 4-20mA current and voltage driver with a precision reference and a buck/boost converter to enable a 25 percent smaller total system footprint compared to the nearest competing device.

According to TI, the new DAC 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 while optimising power consumption.

Key features and benefits of the DAC8775 data converter:

  • For reliability, the DAC has on-chip diagnostic features including smart alarms that monitor open load, short circuit, over-temperature, cyclic redundancy check (CRC), watchdog timer and compliance voltage.
  • The device has an innovative auto-learn feature that calculates the load impedance on the 4-20mA loop and clamps the power supply. This enables faster settling time, balancing efficiency with quicker system response.
  • A total unadjusted error of 0.1 percent 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 temperatures. It’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 4-20mA loop. This creates an efficient system with well-controlled thermal performance, allowing more channels in a smaller space.
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To speed development, TI offers a four-channel analog output module reference design which combines the DAC8775 with the LM5166 high-efficiency synchronous buck converter that is said to dissipate less than 1 W of power in factory-automation applications. An evaluation module costing US$149 is also available.

The DAC8775 is available now in a 10 x 10mm quad-flat no-lead (QFN) package and is priced at US$15.72 in 1,000-unit quantities.

For further information, view the full Press release.


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