AD5781 THD

The datasheet specifies Total Harmonic Distortion of 97dB typical (1KHz tone, 10KHz sample rate).

I am having difficulty reproducing this on the Eval-AD5781.  What amplitude was the 1KHz tone?  Was this measurement collected from the Eval Board?  I am seeming around -79dB at 1.3Vpp using the eval board.