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VR connection for HMC745

My customer looked into  HMC745 evaluation board and asked me

why does he have to connect VR to GND through 10ohm resistor for HMC745 when shorting with JP1.

In HMC744, HMC746,HMC748 evaluation board, Shorting VR is to VCC with JP1  through 10ohm resistor.

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