Agreed. But I've got one more concern: The maximum Vo of the CDCM7005 is VCC-.81==> 2.49 volts. The ABSOLUTE maximum input for the DAC5682z CLKIN is CLKVDD+.5==>2.3v for a 1.8V CLKVDD. That's a very real potential of overvoltage on the DAC input, isn't it?
Well, I'm just going to use a 2.5V clock driver.