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AD9959 Frequency Modulation


I am trying to use an AD9959 to frequency modulate and I am experiencing difficulty getting it to do so continuously.  In the evaluation software I currently have a 500 MHz ref clock.  I have RU\RD diabled and I have 2-level mod selected.

In the channel control I have channel2 selected with Frequency Modulation output type.

On channel 2 I am trying to modulate a 80 MHz frequency.  So say I want both 84 and 80 MHz output signals  I only see the frequency change when I manually hit P2 on the Profile and RURD Pin Control.  And in my mind the output signal should carry both frequencies not a single one.  I'm looking at this on a spectrum analyzer and not seeing both frequencies.  Any advice would be appreciated.

Thank you.