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ADV7850 unstable SXGA

Question asked by GuenterOD on Nov 20, 2015
Latest reply on Feb 4, 2016 by GuenterL

Hi together.

 

We currently have the pre-series of a device employing the ADV7850 as the front-end.

Unfortunately 3 of 12 boards have an unstable output at SXGA60 and at 1280x960/60,

1 board also at SXGA75.

This is regardless if the input is HDMI or VGA, it seems to be a problem of the output PLL

or something.

All other resolutions we tested (42) are running w/o problems, even UXGA with 12bit per color.

 

Could someone please give hints for how we can try other settings (register) for the output

PLL stability ? It makes insecure that some boards have this problem and other not.

 

  Thanks in advance

    GuenterOD

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