AnsweredAssumed Answered

(ADV7390)Noise output from the device.

Question asked by donadona999s on Jun 1, 2016
Latest reply on Jun 3, 2016 by donadona999s


Hi !

 

I have some question about ADV7390.

 

Some kind of noise is output from ADV7390.

I am using ADV7180-ADV7391 Eval-board and using "CVBS auto detect" script.

=> I attached the script file.

And I zoomed the waveform.

ADV7390.JPG

The BT.656 data is output from ADV7180 and at the EAV and SAV point , ADV7390 output some kind of noise.

Also I setup the ADV7180's resister, 0x0C to "Force free run mode" and "Output 100% black".

Why does this noise output from ADV7390?

And also to prevent outputting this noise what should I do?

Is it possible to erase this noise by setting resister?

 

 

I want to know this because our customer have this issue.

I will attach customers waveform.

ADV7390.JPG

Also at the display, blue line is in the display.

ADV7390.JPG

Our customer think this happens because of the ADV7390's noise output.

 

I will check about this(display image) connecting ADV7180-ADV7390Eval board to other Eval board

and moving the image area to check this will happen or not .

But I am out this week so it will be next week.

 

If you can tell me why this will happen and how to solve this problem, it will help us and our customer very much.

 

Best regards.

Kawa

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