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DS90UH949-Q1: 27.6KHz noise when doing EMC test

PYTsai
Genius 11525 points
Part Number: DS90UH949-Q1

Hi 

On our system we are using DS90UH949 (cable connect to) DS90UH940 and DS90UH947 (cablel connected to ) DS90UH948. and the video resolution is 1080P.

When doing EMC test we saw a 27.6KHz noise and its harmanic 

Any idea where may the 27.6KHz noise come from ?  not sure if it is related to FPD Link device.

  • 0
    TI__Guru** 103215 points

    Hello PYTsai,

    27.6kHz should be much lower frequency than anything related to FPD-Link. Can you try holding the FPD-Link devices in reset during this test to see if the 27.6kHz noise goes away? Also can you check if there are any clock sources in your system close to this frequency? 

    Best Regards,

    Casey