The benefits of 4-20mA current loop format in process control systems are 2-wire sensor operation, long cable runs, and noise immunity.  The voltages  for the loop can be ranging from 12VDC to 40VDC and  are inherently nonratiometric to the output signal. The MAX1452 low current consumption allows the system to operate from loop  power with a simple  4-20mA circuit drives. Here’s the circuit diagram:

The MAX1452 is equipped with five 16-bit internal calibration registers that can be loaded from the serial digital interface or from EEPROM. You can get more information about MAX1452 at http://datasheets.maxim-ic.com/en/ds/MAX1452.pdf .

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