AD9958 Phase Noise vs. DAC output amplitude

I am looking at the AD9958 and had 2 questions regarding the phase noise:

1.  In the datasheet figures 16, 17, 18 which shows phase noise vs. frequency, what amplitude was the DAC output amplitude for these results?

2.  In general is there any relationship between phase noise and DAC output amplitude?

Specifically I am looking for data at Fout=80MHz.

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