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why I can not use external reference clock ?

Question asked by 1135553530@qq.com on Jul 24, 2017
Latest reply on Jul 25, 2017 by Vinod

when use DXCO ,there is no problem, now I use external reference clock by setting 0x09[5]=1 to bypassing XO. now,I observe the pll ,they are not locked. except for 0x09, what should I do?

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