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ADV7280-M Video chip EMI emmissions

Question asked by Marc@DSE on Apr 29, 2016
Latest reply on May 24, 2016 by Rob.Analog

Hi,

We're using an ADV7280-M chip to do our SD video to CSi interface and it's being run in progressive mode with the de-interlacing turned on. During some EMC testing it was noticed that there was a huge amount of noise around the centre frequency of the CSI link (214Mhz) , as shown in the image below. Ignoring the two large spikes either side, as they are from known sources. The rough shape of the noise changes if the camera is pointed at different things making me suspect it's possible the back end CSI link that's generating a lot of it.  We're actually monitoring emissions from cabling attached and the signal is coming either from video lines or the power lines.

 

Has anyone experienced this kind of situation before? Ideally with ideas of how to help mitigate it?

 

Image.JPG

Best regards,

Marc.

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