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Drivers up efficiency of process control apps

Posted: 14 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:analog output drivers? process control? DAC?

AD5750, AD5751

Analog Devices Inc. has introduced two analog output drivers that significantly improve the efficiency and reliability of process control applications, including those operating with high compliance voltages and temperatures. Using technological advancements enabled by ADI's iCMOS industrial process technology, the AD5750 and AD5751 output drivers achieve a three-fold improvement in accuracy over competing solutions, providing an accuracy level of 0.1 percent total unadjusted error (TUE) under all operating conditions. The devices condition the output of a low-voltage, single-supply DAC to provide high performance voltage- and current-output-drive capability, enabling system design engineers to deliver more reliable, cost-efficient industrial equipment while using less board space.

Designed to meet the growing demand for highly configurable industrial automation controllers, the output drivers offer extensive diagnostic functionality such as fault detection and enhanced sensing capabilities that make system startup and troubleshooting easier. Integrating user-programmable current- and voltage-output capabilities, the AD5750 and AD5751 output drivers are ideally suited for programmable logic controllers, distributed control and high-voltage analog I/O systems.

"Analog Devices' output drivers provide a complete solution for single- and multi-channel analog I/O systems, meeting the growing demand for feature-rich, highly reliable process control equipment," said Mike Britchfield, product line director, precision signal processing, ADI. "These devices offer industrial designers a high-performance system that provides best-in-class drift and stability specifications, helping to increase plant efficiency and lower maintenance costs. Plus, the advanced diagnostics make troubleshooting quick and easy."

Output drivers
The single-channel AD5750 and AD5751 are complete analog output drivers for industrial and process control applications and eliminate the need for additional external components such as shunt resistors, range selection, and fault detection circuitry. The devices handle virtually all standard analog output signaling requirements with selectable hardware or software programmability. The high performance and accuracy of the devices satisfy high-end system requirements of 0.1 percent TUE, 5-ppm/degrees C output drift, and 0.01 percent linearity, eliminating the need for designers to calibrate their systems at multiple temperatures and supplies to satisfy end system accuracy and stability specifications. Analog outputs can drive resistive loads up to 1.5K, capacitive loads up to 1F, and inductive loads up to 0.1H.

The AD5750, which operates from dual 12 V to 24 V supplies, offers four output voltage ranges (0-5V, 0-10V, 5V, 10V) and five output current ranges (4-20mA, 0-20mA, 0-24mA, 20mA, 24mA), with 20 percent over-range capability.

The AD5751 operates from a single 10.8V to 60V supply, facilitating reliable factory communications over long cables. It offers three output voltage ranges (0-5V, 0-10V, 0-40V) and three output current ranges (4-20mA, 0-20mA, 0-24mA), with 20 percent over-range capability.

The AD5750 and AD5751 incorporate a 30MHz SPI and power-on reset circuitry and are fully specified over a -40C to 105C temperature range. Both devices integrate packet-error checking (PEC) features that verify the interface data has been correctly received in the presence of noise, which is useful in industrial environments where data communication corruption can occur.

The AD5750 and AD5751 are sampling now, and full production quantities will be available in November. The devices are housed in 5mm x 5mm LFCSPs and priced from $2.45 in 1,000-unit quantities.





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