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ADF4372: The function of internal LDO for VCO

Category: Datasheet/Specs
Product Number: ADF4372

Hello,

I have a question from our customer about the internal LDO for VCO of ADF4372.

Q1. About bit7 of REG002F, "SWITCH_LDO_3P3_5V" usage.
   Can he select the voltage, 3.3v or 5v, of VCC_REG_OUT outputs using this register?
   If not, could you please explain the purpose of this register and how to use this?

Q2. If Q1 is yes, what voltage for VCC_LDO should be higher than VCC_REG_OUT? (What voltage is needed for the headroom?)

Q3. If REG002F[7] does not affect the output voltage of VCC_REG_OUT, what voltage will be output from VCC_REG_OUT, when 5v be input to VCC_LDO?

Best regards,

y_suzuki