I need to perform amplitude ramps between two non-zero given levels (eg. from 0x12DF to 0x38D7 values of amplitude digital word and vice-versa). I have been working with the AD995x DDS family but it seems impossible to do.
With the OSK pin I can perform ramps between zero and a given level... and using the RAM registers I can only perform ramps between two (or more) levels in case of phase and frequency.
I am missing something or is that just impossible to do? If it is so, can anybody tell if any DDS which can perform this kind of ramps?
Thank you very much.