AnsweredAssumed Answered

[ADV7180] Color burst detection 2

Question asked by Tamu on Sep 26, 2017
Latest reply on Oct 16, 2017 by Tamu

Hello,

 

I have a question of ADV7180.

This question is related to the following thread.
https://ez.analog.com/message/317815

 

In this thread, I asked following question.
>Question 1:
>In HSYNC frequency change test,
>when the HSYNC frequency is changed 15.75kHz plus-minus 8Hz, he can see an image without color on the display with ADV7180.
>In case of AK8859, he can see an correct image with color with the same condition.
>(He can see the correct image with color within 15.75kHz plus-minus 260Hz in AK8859.)
>The condition of "HSYNC frequency is changed 15.75kHz plus-minus 8Hz" means moving the color burst synchronous with the HSYNC.
>Is there any way or register to improve this?

 

You answered we can try modifying the Chroma shaping filter "CSFM[2:0]", C Shaping Filter Mode, Address 0x17[7:5].
My customer changed the register, but he could not see improving by this.

 

Question:
Is there other register or method to improve the Question 1?
Do you have any other idea?

 

This question is for automotive. And this is required by RFQ from OEM.
So this must be cleared for ADV7180 design-in .

 

Thank you!
Best regards.

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