Thanks, Dave,
Some observations:
- we observed the tones at 192 KHz as well at 96KHz; in our applications we use varied fSAMP values, such as 100KHz, 65KHz, 50KHz, 25KHz etc.
- we generate signals with frequencies up to about 0.4 fSAMP; I could not find a number for fSAMP Min for 1853 or 1955;
- indeed, varying DC in SDATA, no AC, the tones move up and down and at some point they get out of picture (0.4 fSAMP); then, when AC signal added, for some specific range of amplitude (ex: fSAMP:100KHz, 3KHz, -20dbFS), the tones come back as a string of products (-85dB), moving up and down in frequency (and amplitude) with the signal frequency and amplitude.