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Ad9914 SYNC_CLK problem

Category: Hardware
Product Number: ad9914
Software Version: ISE14.7

Hi, We are using AD9914 in our board. After power up,we set the master reset to 1 to reset the ad9914,then we set the  master reset to 0.we need to see the SYNC_CLK output at the pin 82. When the  temperature is 25℃,we can see it,but when  the  temperature is -40℃,we can not see the  SYNC_CLK .