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How to Programmable RF output phase feature in HMC835 to synchronize multiple HMC835LP6GEs

Question asked by IH-PGY on Jul 17, 2015
Latest reply on Aug 17, 2015 by dyoung1

Hi, I want to know how to synchronize two HMC835s in phased array applications. Both of them are in fractional mode and in the data sheet of HMC835, the detail of how to synchronize multiple HMC835s is not mentioned. Is it sufficient to program the Reg 1Ah Seed Register to set the start phase? When should I program Reg 1Ah? Should I program all the HMC835s simultaneously? And the duration of rising edges of SEN in different HMC835s should be considered?

 

Additionally I want to confirm that as there is only one SPI mode in HMC835the power-on level of SCK, SDI, SEN, SDO can be both of  low and  high which are different in HMC830 and HMC704?

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