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ADV7511 and nonstandard HDMI frame rates

Question asked by JasonH on Aug 29, 2011
Latest reply on Aug 29, 2011 by DaveD

I'm considering the ADV7511 as an HDMI output device for a focal plane array electronics board I'm designing.


The pixel rates that are generated by the sensor I'm using are potentially
variable, and that means the resulting frame rates of the video data are
also variable.  Nominally the sensor runs at 30 Hz, but it can run as slowly
as approximately 22.5 Hz.  Ideally, we'd like to be able to set the pixel
rate (and thus the frame rate) to an arbitrary frequency in that range.
But I'm seeing that the ATSC spec (on which HDMI is based) only defines
specific frame rates (in the range in which I'm interested: 30, 29.97, 25,
24, and 23.976 Hz).  Is it possible with the ADV7511 to generate arbitrary
frame rates in the 30 Hz to 22.5 Hz range?  We are interested in making a
1080p output across these frequencies, and hopefully use commodity PC or TV
monitors to display the output.