AD8339 input RF 4.15V

Question

Hi there, 
 I have a question regarding the AD8339. 
 When the inputs are all floating, a voltage of 4.15V can be measured at the input RF terminal. What is the situation? 
 
 Could you help on this ? 
 
 Thanks.

dzaleski · Accepted Answer

Hi, 
 The RF inputs are PNP stages and if left open the base currents will flow into a high impedance until the current sources that supply the input PNP stages saturate. They need to be externally DC biased at 2.5V for a VPOS=5V.)

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AD8339 input RF 4.15V