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UG-290 AD9484


I've recently bought the evaluation board UG-290 with AD9484 and HSC-ADC-EVALCZ Data Capture Board. I wonder whether there is an on-board clock to use so that I don't need to connect an external clock. The datasheet has mentioned the on-board oscillator but doesn't say how to use it. If I connect nothing to the CLK interface, I cannot get the signal. So, can I get the signal without an external clock? If can, how to make it?

Thank you for your help!