In fact, I am building a PLL with HMC703LP4E and HMC447LC3 prescalar. My VCO is powered by 5V. I'd like to know if it's better to power HMC447 by VCO 5V or by HMC703 5V (VPPCPA pin 14).
I'm forwarding this to one of the RF application engineers who should be able to answer the questions about the 5V supply.
You want to isolate the HMC703 charge pump power (VPPCPA) and level shifter for the charge pump control signals (VDDLS) from the VCO. I suggest powering the HMC447LC3 prescaler off the VCO 5V rail.
Thanks for your help.
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