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LMK04821: Maximum configurable output frequency

Part Number: LMK04821

Hello everyone!

I hope this question isn't too simplistic.

I've been looking through the 0482x device family for a JESD204B clock tree design. The 4821, the only device that supports VCO1 division, seems to come up in searches with a max output frequency of 2GHz. However, looking through the datasheet, I can't find the parameter that prevents it from outputting its full 3GHz rate, on par with the 4828.

What am I missing?