Before I go for my letter body please accept my apologies about the bad English i have used in this letter.
I was wondering what Ramp UP (RU) and Ramp Down (RD) means in DDS and what they do . Also I have read the datasheet but unfortunately i was not able to find the answer.
for example when i set DDS for an Eight-level modulation on Channel 0 with RU/RD, P0 ,P1 , P2 are for input binary bits and P3 is for RU or RD.
is this some modulation scheme or just a way to have better performance?