Questions about AD9146 frequence

Hi Sir:



We are surveying dual channel 1GSPS DAC for my project of network analyzer.

But I have some questions on AD9146.


We plan to generate DC~250MHz I/Q signal randomly.

In AD9146 datasheet page7, I do not understand.


If we bypass HB1 and HB2, using interpolation 1X, the data interface can be 1200MSPS. Why f_DAC=300MSPS?


With 2X and 4X interpolation, these number does not make sense to me either.


Could you help me clarify how these number come from and the suggested mode for our application?


Thanks and B.R.