EVAL-CN0179-PMDZ (ANALOG DEVICES)

The EVAL-CN0179-PMDZ is an Evaluation Board for 4 to 20mA low power 14-bit process control current loop transmitter. The 4 to 20mA current loop has been used extensively in programmable logic controllers (PLCs) and distributed control systems (DCS's), with digital or analogue inputs and outputs. The combination of the low power AD8657 dual op amp, AD5641DAC and ADR02 reference allows more power budget for higher power devices, such as microcontrollers and digital isolators. The circuit output is 0 to 20mA of current and it operates on a single supply from 8 to 18V. The 4 to 20mA range is usually mapped to represent the input control range from the DAC or micro-controller, while the output current range of 0 to 4mA is often used to diagnose fault conditions.