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ADF4110 Charge Pump Voltage

Question asked by ChrisH Employee on Feb 4, 2011
Latest reply on Feb 4, 2011 by rbrennan

Hi,

Would appriciate a bit of expansion about the charge pump voltage - particularly as follows.

- Graph 27, page 11 of Rev C datasheet, shows 2 lines voltage lines which presumably are the voltages the CP switches between on pin 2 of the TSSOP package part.

adf4110 chargepump.PNG

The bottom line is missing a lable, but presumably will be VPN ??

Can you describe the CP operation in voltage terms as it relates to this table.

Of particularly concern, from an intrinsic safety standpoint, is there ever a condition where the voltage delivered to the cap can be higher than the absolute voltage level of charge pump power supply Vp (Pin 16 on TSSOP)?

 

Thanks

 

C

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