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ADV7128 artifacts in PAL

I’ve been evaluating the ADV7182 (Analog  to SDTV Video Decoder) for use in a

next generation product.  I’ve been comparing its performance against another part..

Overall, I’m pleased with the part, but I do have a fairly big issue.

The part will used as a composite video decoder (NTSC or PAL).  I have made

several signal measurements in NTSC and PAL (gain, freq. response, DP DG, etc.)

and the ADV7128 equal to or better than the other chip.  In NTSC mode,

playing video with scrolling text, multiple graphics layers, and high frequency

content, the ADV7182s comb filter and DNR adjustments allow for better

performance?.

However, in PAL mode,  the other part does much better.  The ADV7182 has way too

much dot-crawl, no matter the  PAL comb-filter register settings.  Are there

any other adjustments to improve the PAL comb filter?

Also ,the evaluation board that I’m using is EVAL-ADV7182/7280BZ (REV. A) 

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  • 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

Reply
  • 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

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