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Noise in the DVI Output of ADV7511W

Hi,

We are using ADV7511WBSWZ for DVI Output in our board. The set up is as shown in the attached image.

The cables used for connection are shielded.

We have observed that, there are white blinking dots on the output (On Monitor).

We tried to display only one primary color(any of the three) bar on the screen, with darker color the dots are not visible, but with lighter shades of the same color( with mix of other two primary color) dots are visible.

Have anyone have come across this kind of issue ?

Please help us to solve this issue ASAP.

Thanks & Regards,

Nanjunda M

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  • FormerMember
    0 FormerMember

Twisted pairs like this will introduce impedance mis-match and allow a point for noise to couple in.  I once had a system where a bad ballast in the overhead fluorescent light was injecting noise into the system.  (i.e. The system would only work in the dark)

The twisted pair probably does not maintain the 100 Ohm differential spec'd for HDMI. 

Another possible noise source is a ground loop.  If the cable has a shield, try disconnecting the shield at one end or the other.  This assumes there is still a ground wire in the cable.

Also is the P2/J2 and RTM/RTM connector rated for 1GHZ 100 Ohm differential?

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  • FormerMember
    0 FormerMember

Twisted pairs like this will introduce impedance mis-match and allow a point for noise to couple in.  I once had a system where a bad ballast in the overhead fluorescent light was injecting noise into the system.  (i.e. The system would only work in the dark)

The twisted pair probably does not maintain the 100 Ohm differential spec'd for HDMI. 

Another possible noise source is a ground loop.  If the cable has a shield, try disconnecting the shield at one end or the other.  This assumes there is still a ground wire in the cable.

Also is the P2/J2 and RTM/RTM connector rated for 1GHZ 100 Ohm differential?

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