Hi,
If you are really wanting to use this board, then there are other ways of analog measuring.
You can time the period it takes for the sampled voltage to charge a capacitor.
Or use PWM output to a LP filter and compare the sample voltage with the filtered DC from the PWM.
As you ramp up the duty cycle, the filtered voltage increase, the comparator will tell you when it is higher than the sample voltage.
You can calibrate PWM duty to the filtered DC and use that to give you a reading.
Just a thought.. Tom... 
