From my last discussion, i decide to start over with all my configuration and I think it was a firmware problem because now I can generate low and medium frequencies.
Now the problem is that in frequencies greater than 1Mhz, the ad9834 output is with less amplitude. I was reading some application notes and it seems that DDS works like that. While I get closer to mclk/2 the amplitudes is almost 0. I understood right?,..
If this is correct, is there a way I can have a 37.5Mhz with a stable amplitude at the ad9834 output ?
Can I overclock the device maybe to 120Mhz or 100Mhz?
if 37.5Mhz is not possible, at least 10Mhz or 20Mhz could be generated with stable amplitude?