In my DDS system , a AD9854 is used,we need to generate a 3105.2Hz sine output,How to setup the Frequency Tuning Address 4 hex to Address 9 hex(REFCLK=20MHz)
The 48-bit tuning word value (FTW) is given by:
FTW = round[(fo/fs)*2^48)
Where fo is the output frequency and fs is the system clock frequency (3105.2 and 2*10^7, respectively, in this case).
Therefore, FTW = 43,701,804,884 (0x 000A 2CD4 9F54).