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ADF5356 lock only on after the second REG0 writing

Category: Hardware
Product Number: ADF5356

Hello! I am testing a new board with the ADF5356 PLL. The only way I get the LOCK state is when I repeat the REGISTER 0 writing. Can you explain this? Is it normal? Of course with the Development Kit I have only one writing for the REGISTER 0 and the lock state is fine.  The delay between REG1 writing and REG0 writing is 1 msec. Thanks!