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ADuM6402 180MHz immunity

Question asked by power-man on Jul 27, 2015
Latest reply on Jul 27, 2015 by bkennedy



Thanks to your advice, the 360MHz EMI was improved 20dB.

But the result of 180MHz EMI was not good compared with the expectation.


They took a measure as below,

change from 2-layer to 4 layer

Edge guard

stitching capacitor: 30pF

Safety cap: 2200pF

ferrite at Viso and GNDiso 


It is helpful if you have advice.

The current noise 54dB

Target noise 40dB