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About the REF CLK of Evaluation Board of AD9914?

Question asked by zhoubo on Feb 23, 2018
Latest reply on Feb 28, 2018 by mcee

Hello. 

I am developing the evaluation board of AD9914. 

I have not found enough information about this board and I have some problems in evaluating it. 

1. Electrical characterics of REF CLK: Should it be a sine wave or square wave? How about the amplitude? I have set the REF CLK to a square wave with 1.0Vpp and 100MHz. I do not know whether it is right or not.

2. PLL: If there is no REF CLK input, there is output singal. I wonder to know wheher the REF CLK input is necessary? Could PLL generate system clk itself?

3. Output singal frequence: the frequency of the output signal is different to the setting frequency. In the profile mode, the frquency set is 1MHz, and the output is about 625KHz. The frequence set is 1GHz, and the output is about 625MHz.

 

Thank you very much.

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