AnsweredAssumed Answered


Question asked by tneagoe on Feb 8, 2012
Latest reply on Feb 9, 2012 by EBarnes

In the Analog Device chip AD9949 there are sampling clocks called SHP/SHD set in one register.

These clocks are used to program the dark and white sampling of the analog video signal.


We have set  SHD values lower than SHP values and it seems to work great for our cameras.

However, if we read carefully the specs, SHP should be lower than SHD.


SHP is the sampling of the dark level and SHD is the sampling of the white level.

Ordinary the dark region comes before the white region and thus SHP should be lower than SHD.


We have SHD lower than SHP and it works.


So the question is: should we have SHP lower than SHD? Would that give us better results?