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ADM2687 Emission Problem

Question asked by meir.mardechayev@phnx.co.il on Jun 29, 2015
Latest reply on Jun 30, 2015 by RAnslow

Hello ,

 

My name is Meir and I am DFAE.

 

One of my customers use the ADM2687 - Signal and Power Isolated RS-485 Transceiver.


They have an emission issue on ~180MHz frequency and 360MHz frequency (the second harmony) and they can't to pass the EMC/EMI sertification.

We suppose that this emission is a result of the oscillator of integrated Isolated power supply that his frequency is 180MHz.


Please see the attached files:

Schematics, PCB Layout, Radiated emissions results.

With the special probe we saw that the emission come from the chip.


Appreciate if you could help us to solve this problem.


Thanks a lot,

Meir


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