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AD5420 Iout 18 ohm resistance needed?

Question asked by Dtanaka on May 13, 2012
Latest reply on May 21, 2012 by MCollins

In AD5420 datasheet rev c, on the 27 of 28 page, it has a industrial application suggested circuit. 



On the Iout pin, there is a 18 ohm resistor, how was this resistor value calculated, assuming that it is for transient voltage protection