I'm trying to use the AD2 pattern generator to create a (digital) sine wave using a value table table. I connected the external trigger to a clock of 10MHz, to create a sine with the frequency of 10/1024 MHz (with 1024 being the size of the table). When I compare the resulting sine wave to a sine wave generated by an FPGA, using a look-up table with the same size and clock, I see that both signals drift apart from each other, even though both of them seem to have the same period. Am I using this tool the wrong way? Is my setting for a trigger wrong somehow?