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AD9789 DCO FS with four channel

Question asked by kappasm on Jul 17, 2011
Latest reply on Jul 20, 2011 by kappasm

Hi,

 

I currently use the DAC AD9789 wiht only one channel input ad Fbaud of integer part of Fdac, FS pis is therefore always high. Now I must to interface the DAC with four channel input that are not a integer multiple of Fdac. I must use a P/Q interpolator, then the FS pin will be active.

 

I will use this type of connection from FPGA to DAC (bus 32-bit, data 16-bit, complex) :

 

AD9789 Data Bus 4 Channel.PNG

 

How use a FS pin to align the data ? On the data sheet is not very clear and there is not an example.

 

This is what I understand:

 

AD9789 Load Data.PNG

It' true ?

 

Thanks very much.

 

Kappasm.

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