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AD9957 DAC Data rate (symbol rate)?

Question asked by Karami on May 5, 2013
Latest reply on May 22, 2013 by sitti



according to AD9957 data sheet, the maximum input data rate is 250MSPS. so, The input to the AD9957 is an 18-bit parallel data port in QDUC mode or interpolating DAC mode. In QDUC mode, it is assumed that two consecutive 18-bit words represent the real (I) and imaginary (Q) parts of a complex number of the form, I + jQ.

I have a question:

Is symbol rate 250MSPS or rate of each branch I & Q  ?

Is data rate of (each branch) I or Q is 125MSPS?


In other words, CAN I TRANSFER 250MHz BANDWIDTH via FPGA to AD9957 ? (or it is limited by 125MHz bandwidth?)

So, my graphical question has been attached