I would like to use the AD9956 in the LO and baseband modulation generation mode. As per Fig 24 in the datasheet, I would like my VCO to generate ~2,5GHz tone. However, here is my question:
Few things to make sure if VCO output is 2,5G:
1) I have to set R appropriately so that SYSCLK does not exceed 400 MHz
2) I have to set N appropriately so that PLLOSC does not exceed 200 MHz.
However, to set the R and N values, I first need to program the registers of the AD9956. So if that's the case, before I successfully program this values, how will the PLL loop behave, and subsequently, how will my VCO output behave?
Thanks in advance!