AD9956,DDS

Dear ADI engineer, hello, I have some questions about AD9956 and would like to ask you.

I use AD9956 to generate a single tone signal or frequency sweep signal. Is my circuit diagram correct?

especially for many pins that I don’t use, such as PLL. How should I deal with them? All unnecessary pins are connected in series with a resistor To the ground, like this?

if it is possible,Can you tell me which resistance is more suitable? I want better performance。

Thanks,

good luck!