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Poor SNR of ADV7180 and ADV7391?

Question asked by lmclmc888 on May 4, 2014
Latest reply on Jun 11, 2014 by lmclmc888


I use ADV7180+FPGA+ADV7391 to develop one product. The input and output videos are all CVBS.

Now I find that the SNR of the out video is only 46 dB, it is too small,what is the problem?

Most sch and pcb layout are same with ADI datasheet and eval board.

If need,We can supply the sch and pcb layout, thanks very much.