Analog Devices, Inc. (NYSE: ADI) recently introduced four new precision digital-to-analog converters (DACs) that significantly improve the reliability of industrial process control applications in harsh factory environments, including those operating under extreme temperatures or high compliance voltages. The offering includes four 12-bit to 16-bit single-channel DACs that integrate user-programmable current source and voltage output, making them ideally suited for factory process control, distributed control, and smart transmitter systems. By eliminating the need for bulky discrete analog circuitry and mechanical pin-strapped configurations, the DACs reduce board space by as much as 70 percent compared to competing solutions, enabling system design engineers to deliver more cost- and space-efficient industrial equipment.
The new products, which include the AD5422, AD5420, AD5412, and AD5410, leverage the technological advancements enabled by Analog Devices’ iCMOS(TM) industrial process technology, allowing them to achieve the high voltages needed by industrial applications. The AD5422 single-channel 16-bit DAC operates from a single 12-V to 48-V supply, or dual ±12 V to ±24 V supplies. The output configuration is software selectable from options of 5 V, 10 V, ±5 V and ±10 V in voltage mode and 4–20 mA, 0–20 mA, and 0–24 mA in current mode. All output spans include an additional over-range setting.
The AD5422 offers an accuracy level of 0.1 percent TUE (total unadjusted error) while operating in voltage or current mode and includes a precision 5-ppm/ºC internal reference. Internal fault detection circuitry provides hardware and software indication of line faults, such as opens or shorts in cable wiring or remotely located loads. The device also integrates an over-temperature indicator. To sense output voltage, it includes a buffered voltage output with force and sense capability that can compensate for series protection resistors and field-wiring resistance. The on-chip programmable precision output amplifier allows rail-to-rail output swing to be achieved, maximizing dynamic range and enabling the device to deliver the performance needed in a wide variety of industrial applications. Analog outputs can drive capacitive loads up to 1 uF and inductive loads up to 1 H.
The AD5412 is a pin-compatible single-channel 12-bit current source and voltage output DAC. The AD5420 (16-bit) and AD5410 (12-bit) operate in current source mode only. With a single 12 V to 60 V supply, their output configuration is software selectable from 4–20 mA, 0–20 mA and 0–24 mA options.
The new DACs feature a 30-MHz serial peripheral interface (SPI), power-on reset, and hardware CLR and CLR- select functionality for output control. Each device is fully specified over the industrial temperature range.
All of the devices are housed in 24-lead TSSOP (thin-shrink small-outline) and 40-lead LFCSP (lead-frame chip-scale) packages. Sample units are now available.
|Product #||Resolution/Configuration||Compliance||Accuracy||Price (1K unit)|
|AD5422||16-bit, 4-20-mA current source & voltage out DAC||±24V||0.1% TUE||$4.95|
|AD5420||16-bit, 4-20-mA current source DAC||12-to-60V||0.1% TUE||$4.32|
|AD5412||12-bit, 4-20-mA current source & voltage out DAC||±24V||0.3% TUE||$3.79|
|AD5410||12-bit, 4-20-mA current source DAC||12-to-60V||0.3% TUE||$3.35|