Re: Poor SNR of ADV7180 and ADV7391?

Hi,

Thanks at first.

Now the video source is just flat field(luma).

"Are you going CVBS out or just Luma out? I would try going luma out and record the result."

What should we do?

And thers is only one switch power chip(LM2576T-5) on the board. We had made a test. We use one LM7805 to change LM2576T-5, but the status is same.

Please look picture 3 and picture4.  Using the differrent filter of ADV7391(luma SSAF and luma QICF), the result is defferent too.

The last, refer to picture 6 and 7, when using the LPASS filter of equipment,the result is better. Do we need to add one LPASS?

And we will use the external power and test it.

Regards,

Cheston