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Analogue output module for a 0-5V to 4-20mA signal converter

Series

By Dr. Murat Uzam, Academic and Technical Author, Turkey

This series of columns is dedicated to a project involving thirteen analogue input modules and seven analogue output modules to connect to the ADC/DAC channels of a 5V microcontroller.

This month we present the last article in this series, which focuses on the seventh analogue output module for a 0-5V to 4-20mA signal converter that provides current output from 4mA to 20mA and requires a +12V DC power supply.

In this design, we’ve assumed that VIN is taken from the DAC output of a 5V microcontroller with 0.00V £ VIN £ 5.00V. When 0.00V £ VIN £ 5.00V, IOUT = (VIN / 0.25)mA. Input voltage range (VIN) = 0.00V to 5.00V, therefore output current range IOUT = 0-20mA.

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