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Sync 2 AD9172 EVM board

 Hi !

 I've 2 AD9712-FMC-EBZ boards and 1 HMC7044-EVM board from ADI. I need sync 2 DAC  boards but HMC7044 integrated with DAC board not have external connector for SYNC or RFSYNC pin (HMC7044 need this pin to synchronous sysref signal) .Is anyone know other solution to sync these boards???