I posted a while ago relating to problems with the ADV7181C sampling SVGA (800x600) video @ -40C. I thought the problem was resolved but
we have had trouble repeating the test results on other modules. A number of investigations are under way.
For the external loop filter, there is a 1.69K resistor, in series with a 82nF capacitor. I could not find an 82nF COG dielectric part so we use 68nF and 15nF
capacitors. They have a 5% tolerance on capacitance with a temperature coefficient of 0.1% with temperature as expected, could this affect the operation of the circuit?
The end effect on the display looks like the line length is varying on alternate lines. If required I can post a picture.
In a related investigation, we have discovered that the +3.3V supply is somewhat noisy in our system. Can noise on the +3.3V supply affect the PLL operation?