16-bit DAC offers lowest power, 3x more accuracy
Designed for loop-powered smart-transmitter applications used in industrial equipment, the AD5421 D/A converter with on-board power management circuitry is a complete loop-powered digital-to-4-to-20-mA transmitter that consumes 50% less power and offers a 55% footprint saving over competing offerings. Presented as offering three times more accuracy than competitive products, the DAC provides on-chip diagnostics that increase system uptime of process control systems located in large plants, such as oil refineries.
In addition, the part includes a voltage regulator, which is commonly used to power itself and other devices in the smart transmitter. The regulator provides a programmable output voltage of 1.8 to 12 V. The device also contains precision 1.25- and 2.5-V references, eliminating the need for a discrete regulator and voltage reference.
Consuming only 250 µA of quiescent current, the AD5421 offers 0.05% max TUE (total unadjusted error) and 5-ppm drift performance. The AD5421 can be used with standard HART (highway addressable remote transducer) protocol circuitry and offers NAMUR-compliant output ranges. Housed in 9.7 x 4.4-mm 28-lead TSSOP or 5 x 5-mm 32-lead LFCSP packages, the DAC is specified over the extended industrial temperature range of –40° to 105°C and incorporates a standard SPI-compatible interface. ($4.52 ea/1,000 — samples available now.)
Analog Devices , Wilmington , MA
Customer Service 800-262-5643
http://www.analog.com
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