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AD9745 dac output


We are using AD9745 for our application. I am giving an input clock to DAC as 80MHz and DCO is 80MHz, The data input is 64 samples 2'scomplement data. I see the output of DAC in scope at I and I~ as 617KHz sine wave instead of 1.25MHz(80MHz/64). I used all the registers are default registers. Can some one point me to problem why i am seeing 617KHz instead of 1.25MHz sine wave frequency?