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Question asked by tbuie on Sep 18, 2017
Latest reply on Sep 20, 2017 by mattp

We are trying to design in your ADV7612 or ADV7611.  We only have one HDMI input.  We need 1280 x 1024 pixels (@60Hz), using a 108 Mbits/sec 12 bit DDR bus running 4:4:4 RGB on our output.  (We are pin limited to a 12 bit bus.)  On page 12 of the ADV7612 data sheet it says, "170 MHz conversion rate, which supports RGB input resolutions up to 1600 × 1200 at 60 Hz" (which looks very promising).  Page 13 says, "DDR 12-/24-/30-/36 bit 4:4:4 RGB" where we need 12 bit data (which also looks promising).  Just before Table 5 is a really troubling sentence, " DDR mode is only supported only up to 50 MHz (an equivalent to data rate clocked 100 MHz clock in SDR mode)" where we think we need 108MHz.   Table 5, page 16 only shows 24/30/36 bit DDR 4:4:4 RGB (clock/2) where we need 12 bit.  We think we need 108 Mbits/sec to clock 1280 x 1024 pixels (@60Hz) on a 12 bit DDR bus.  Please let us know if the ADV7612 (or any other IC you have) will do our job.  As you can see, there are several conflicting claims on the data sheet.  And yes, like every project, we are in a hurry.    Thanks   Tommy