AD8194

Hi Jose,

We do try very hard to make our solutions robust even when interfacing to non-compliant sources and sinks.  There's always a limit to how for out of spec a source can be and still work.  I am not a AD9880 expert, but it would certainly seem the AD9880 is more tolerant in this scenario.  The AD9880 is deserializing and processing the TMDS data.  The AD8194 is essentially an analog differential comparator.  So if one side of the differential pair is at the rail, there's very little gain and not surprising that bit errors are occuring. 

It's common for this type of problem to be a mechanical (broken pin) problem with the connector.  If the graphics card is removable, perhaps you can check and if necessary replace the DVI connector.

Dave

Hi Jose,

We do try very hard to make our solutions robust even when interfacing to non-compliant sources and sinks.  There's always a limit to how for out of spec a source can be and still work.  I am not a AD9880 expert, but it would certainly seem the AD9880 is more tolerant in this scenario.  The AD9880 is deserializing and processing the TMDS data.  The AD8194 is essentially an analog differential comparator.  So if one side of the differential pair is at the rail, there's very little gain and not surprising that bit errors are occuring. 

It's common for this type of problem to be a mechanical (broken pin) problem with the connector.  If the graphics card is removable, perhaps you can check and if necessary replace the DVI connector.

Dave