I've got an AD9985A with a PC VGA signal at 873x500 60Hz.
My problem is that my VSYNC output pulse width is too large (about 105,5 µs) for my display (30µs max, 11.16µs typical).
Is there any solution to reduce it ?
First of all the AD9985 does not have a way to adjust the VS pulse width based on line count like the HS pulse width based on pixel clock.
Second of all I'm a bit confused. If we look at VESA standard 848 x 480 @ 60 (which is close to your inputs), VS pulse is defined as 8 lines or 258 us. One line is 32.2 us. What you are saying from your resolution above, you want the VS pulse to be less than one line (11.16us).
My VESA calculator spread sheet also tells me 873x500@60 reduced blanking, the VS pulse should be 10 lines or 322.5 us
Thanks for your answer, the display specs are not very clear. I've made a mistake, Ive used the sync pulse width duration instead of the line duration. My line is about 30,33µs so finally the timings are correct.
Sorry for the inconveniance.
Retrieving data ...