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what does Ramp Up or Ramp Down mean in AD9959?

Question asked by danteisalive on Jun 12, 2013
Latest reply on Jun 24, 2013 by Kevin.G

Hi everyone.

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?

thanks anyway