AnsweredAssumed Answered

Noise trouble for ADV7393

Question asked by Kaos on Jul 24, 2013
Latest reply on Aug 27, 2013 by Kaos

Dear Sir/Madam,


I just met a trouble as following.


Your device: ADV7393
Trouble: Appear the 4 violet noise-areas on screen only when the camera look the fluorescent lamp(Pls refer to my enclosed “ez-trouble picture.png”)


1) Why this trouble have happen? Do you have the similar info?

2) I think that need the adjustment of loop filter value for fix this trouble. Is this correct way? If so, what the calculating formula? Can you show it to us?

3) As for the values of your loop-filter, which is correct on datasheet or evaluation board document on my enclosed sheets in red.("ez-difference of loop filter value ADV7393.pdf")


I also enclosed the schematic and the trace layout of PCB.


My loop-filter have been put at not so far place on PCB from ADV7393 EXT_LF pin. So no problem I think…..


Thank you, Kaos