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ADV7441A Analog Noise on Component Input

Question asked by babs76 on Oct 6, 2011
Latest reply on Oct 27, 2011 by GuenterL

Hello,

 

We have finished a design with the ADV7441A and have both the composite and component video working. The composite imagery looks fine in our processor, but the component displays some analog noise in the imagery. Basically there are small "waves" or "ripples" at the top of the image.

 

I've checked our schematic against the recommended connections in the datasheet and they are identical in terms of the component analog front-end.

 

Now my inputs to the connector are not shielded into the board currently, that is the next thing I will try with mini-coax connectors.  I was just wondering if there is anything else I can check either internal to the ADV7441A, in terms of register settings, etc. or with my design that could cause or remedy this issue.

 

I've attached a zoomed in image of the noise. Basically our camera is staring at the ceiling and you can see the ripple where the ceiling meets the light.

adv7441a_component_analog_noise.jpg

Thanks,

 

Brent

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