HMC850LC3 - typical value of current on VR pin

Question

What is typical current into V_R pin on the HMC850LC3? Is it a function of V_R voltage? Is there data available on Current into V_R vs DC @V_R voltage level?

salemdar · Accepted Answer

Hi, 
 Usually 2-3 mA is drawn from VR pin to adjust gain. The relation goes linear such that as the VR is increased more current is drawn. We dont have a characterisation for VR current vs voltage specifically for this part but an easy implementation would be choosing appropriate VR for your application and inserting a series resistor to create a voltage drop referenced to the supply of the IC(for this case, insert a resistor between GND and VR) 
 Sinan)

salemdar · Answer

Since the part is biased between GND and -3.3V, resistor method can only be used for VR<=0V values. If you want to apply a poisitive VR(0.4V i.e.) you need an external positive supply and a resistor to create drop to adjust 0.4V. Sourced current is constant with respect to VR voltage and current is always drawn from that pin.

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HMC850LC3 - typical value of current on VR pin

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