Ad9914 SYNC_CLK power problem

Hi, We are using AD9914 in our board. After power up, we need to see the SYNC_CLK output at the pin 82,we use the the oscilloscope to see it ，whe the temperature is 25℃，its power is 1.8V。whe the temperature is 0℃，its power is 2.2V。Dose the  power of the  SYNC_CLK change with the temperature？I can not see the description  of   power of  SYNC_CLK description in the datasheet。