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ADM3054 1MHz Emission fails

Dear Sir,

ADM3054 1MHz Emission fails

We are using ADM3054 for Can isolation transiver.


From Our EMC emission test , we can see every 1MHz noise (which over some limit line on 100MHz)

After some investigation , we have find ADM3054 make this noise.

- With Near field probe , ADM3054 make 1Mhz noise
- Check LISN and 5V line of ADM3054 VDD2, we find it as attaced.

I am not familiar with  the internal architecture of ADM3054.
Why AMD3054 make this noise?
From ADM3054 datasheets, It's seem there is no active switching components on ADM3054.

I hope your helps.

Best Regards,