About HMC778 PIN: VCCVCO

Question

Hi, 
 I have noticed that in the schematic of evolution board of HMC778, there is an option for pin "VCCVCO2". Shown as following. 
 
 I want to ask the function of "JP2" or is there any difference if I provided 5V to VCCVCO2 or not? 
 Best regards, 
 Zhu Xuran

MRichardson · Accepted Answer

Hi Zhu, 
 This evaluation board is used for several models and some of them do not require bias at pin 8 (VCCVCO2). The HMC778 does require that JP2 be installed in order to properly bias the VCO. 
 Best Regards, 
 Marty)

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About HMC778 PIN: VCCVCO