Monterey (MAXREFDES15#): Ultra-Low Power, High-Accuracy 4–20mA 2-Wire Current-Loop Sensor

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The 4–20mA current loop is widely used as an analog communication interface in industrial applications for transmitting the data from remote sensors to a programmable logic controller (PLC) in a central control center over a twisted pair cable. Here, 4mA represents the lowest temperature value, and 20mA represents the highest measured temperature. There are four main advantages of the current loop. First, the accuracy of the signal is not affected by the voltage drop in the loop, as long as the power-supply voltage is greater than the total voltage drop across the loop. Secondly, it uses two wires for power as well as data communication over the entire loop. Thirdly, it is more immune to noise. And lastly, it is offered at a low cost and easy installation.

Key Features

  • Ultra-Low Power
  • -100°C to +100°C Interval
  • High Accuracy
  • High Precision
  • Simple Power Supply and Wide Input Range
  • System Current Consumption < 2.1mA
  • Resistance Temperature Detector (RTD) PT1000
  • Resolution 10,000 Counts or 0.1%
  • Accuracy 0.25%


The Monterey subsystem design block diagram.
The Monterey subsystem design block diagram.
The Monterey subsystem reference design.
The Monterey subsystem design board.

More Information

New Product Press Release   2013-10-28 ]

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Document Ref.: 00-0000 Rev 0; 2013-10-18
This page last modified: 2014-04-10