Tonight I have rigged the Sparrow DDS together to see what comes out of it. First, I hooked it up to a counter and could measure a coverage from 7.995 MHz to 8.105 MHz coresponding to 100 kHz coverage on the 40 meter band.
The fine tuning gives 10 Hz steps, while the coarse tuning gives 100 Hz steps. I can toggle between the two modes by pressing the encoder. I have not tried RIT/XIT. The current consumption is just below 50 mA.
Next, I have hooked it up to my PCS500 PC oscilloscope and took these nice screenshots: