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Generating simple FSK using AD9910 Eval board

Question asked by amitkumar on Jul 25, 2011
Latest reply on Jul 25, 2011 by DSB

I've been trying to perform FSK (Frequency Shift Keying) using the AD 9910 Eval board. For this I need to generate two different frequencies 56 MHz and 64 MHz alternately for 62.5 ns. To achieve this I've selected the "cont profile 0:1"  in the GUI and loaded RAM locations 0 & 1 with FTW for 56 MHz freq and RAM locations 2&3 with 64 MHz freq (The screen shot of settings done on GUI is attached). I have been able to generate two freq alternately but am facing a few problems namely,
             i.   Amplitudes corrs to two freq are different. Approx 20% difference in the amplitude of the two.
             ii.  Freq so generated are not exact 56 & 64 Mhz
             iii. Not able to control the duration of each freq to 62.5 ns.


Can anyone help me on this!


Thanks in advance.