Norwood, Mass.Analog Devices Inc. has introduced a precision 16-bit DAC (digital-to-analog converter) with on-board power management circuitry designed for loop-powered, smart transmitter applications used in industrial equipment.
The new DAC drives system efficiency by reducing total component count and internal power consumption to allow greater functionality at the remote site. Smart transmitters are intelligent microprocessor-based field instruments that monitor process control variables, including temperature, mass flow rate, and pressure.
According to ADI, its AD5421 DAC is a complete, loop powered, digital to 4-to-20 mA transmitter that consumes 50 percent less power and offers a 55 percent footprint saving over competing offerings. Incorporating programmable voltage regulation circuitry, the AD5421 generates the low-voltage supply required to power the peripheral components within the smart transmitter. By conserving the system power budget, the AD5421 DAC enables system engineers to select more accurate, higher-power sensor electronics or include supplementary functionality, such as extra communication protocols to enhance network connectivity and display screens to improve system interfacing.
The AD5421 includes a voltage regulator, which is commonly used to power itself and other devices in the smart transmitter. The regulator provides a programmable 1.8-V to 12-V output voltage. The device also contains precision 1.25-V and 2.5-V references, eliminating the need for a discrete regulator and voltage reference. Consuming only 250µA of quiescent current, the AD5421 offers 0.05 percent maximum TUE (Total Unadjusted Error) and 5 ppm (parts per million) drift performance. The AD5421 can be used with standard HART (Highway Addressable Remote Transducer) protocol circuitry and offers NAMUR compliant output ranges.
The device is specified over the extended industrial temperature range of –40°C to +105°C and incorporates a standard SPI (serial peripheral interface) compatible interface.
Pricing: $4.52 each in 1ku.
Datasheet: Click here.
Analog Devices, www.analog.com