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180 phase ambiguous of TXs of AD9371 by using Ext LO

Our system is as follows: there are 8 PIECES of AD9371 on each board, with a total of 16 channels.

We found that the phase difference between each piece of AD9371 was not fixed after each power-on, and there would be a random 180 degree difference, which would appear between any two pieces

Would you please advise the possible reasons?Thanks.