On the HMC515, is there any problem leaving pin 6 (VCC1) disconnected if I am only using RFOUT and RFOUT/2?
If the divide by 4 functionality isn't needed, it's perfectly acceptable to leave pin 6 (VCC1) disconnected. This will reduce the total current consumption by 65mA and the total DC power dissipation by 325mW. Please refer to the interface schematic under 'Pin Descriptions' on page 8-4 of the current datasheet for additional details.
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