Yes, I saw this formula. And I understand (I think) that with this mechanism you can "float" the 10 LED display between any two voltages.
What interested me was that apparently you can change the resolution. In their examples they show 3, 2 and 1dB steps displayed by the driver, but unfortunately I have no idea how they accomplish this feat.
The way I understand this is that the steps are fixed by the internal resistors in the driver, but if that was true you could not easily modify the step width-or do I get all this wrong??