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I guess that when you have two sets of DCO and FCO that the octal ADC is split up in two quadruple ADC with
different timing. The picture you show implies that you use the FCO as the inclock. And so you need a PLL for every FCO or 2 per octal ADC in the case you refer to. It would have been nice if you had given a part-number so I can find a data-sheet.
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The part numbers that we are evaluating are from Linear Tech. They are LTM9010 and LTM9012, the first one has 8 channel and the second one has 4 channels but with amplifier circuit insid the ADC chip.
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