ADV7128 artifacts in PAL

The ADV7182 is a 2D comb decoder and as such we exhibit artifacts. If you want better performance you would have to go to a 3D comb part.

I understand  2D vs. 3D comb filters.  My question has to do with the ADV7182s internal registers.

Are there any other adjustments to the comb filter that are not in the data sheet? 

Does AD make a decoder with a 3D comb filter?

Hi Hank,

There are no additional settings available for the comb filter other than what is in the datasheet. ADV7842 has a 3D comb filter. There isn't a decoder-only part with a 3D comb filter (it requres memory).

Dave

Hey Dave,

Thanks for the reply. I had a higher priority issue before I could get back to this one. Anyway, I've been looking at the ADV7800. I only need an analog composite decoder, not HDMI, and 8 to 10 bits output is fine
(Don't need 12 line the 7842). We would like to use the ADV7182, but in PAL the comb filter has too much dot-crawl or the picture is too soft when we adjust the filters to remove the dot-crawl. We didn't see this issue in NTSC. Any issues with the ADV7800, such as Not Recommended for New Design?

Thanks,

Randy

Hi Randy,

Don't use the ADV7800.  I'm not sure how it missed the not recommended for new designs list. It's more expensive than ADV7842, you can't get an eval board, and support is likely to be minimal unless you are one of the 5 customers that buy 99% of them.

Dave