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ADuM6402 180MHz immunity

Hello,

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


Regards,