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AD9106 DDS amplitude modulation; are amplitude RAM entries signed?

Category: Hardware
Product Number: AD9106

I would like to use the AD9106 to output several waveforms.  Ultimately I would like to output two standard DDS sine waves at frequency Fe, which should be no problem.

In addition to this, I would like to output a second tone at a different frequency. I know that it's possible to amplitude modulate the DDS output using a RAM lookup table (as seen in

My question is: when using RAM lookup table to apply amplitude modulation to the DDS output, is it possible to put negative amplitude modulation values in?  Will the AD9106 output respect them?