I'm currently supporting a legacy design video module which uses the ADV7441A. The hardware is a proprietary design.
We have recently been analysing field issues with analogue inputs at resolutions of 1280x1024@60 Hz and 1280x1024@p75 Hz.
Reading through the forum and looking at the standard set-up scripts in the design support files, I became aware of the DLL adjust (User map - reg 6A) and as far as our internal tests are concerned, setting this register cures the problem, and we are planning to upgrade our Firmware.
One customer (installation size of several hundred devices) will not accept our proposed firmware upgrade without further documentation from Analog Devices however.
Beyond what is documented in the HW design manual (Rev J) is there more information available on the DLL and the interaction with the PLL loop filter (Pin 70)?
Further, looking through the set-up scripts, the DLL adjust is not set at all resolutions. Is there further information available on setting this value?