The primary ADC is differential. Can I convert on a single-ended input voltage
by grounding one
of the inputs?.
No, the ADC inputs for the primary ADC cannot be within 100mV of the rails.
Hence one of the
primary ADC inputs cannot be grounded. To convert on a single-ended input
voltage either bias
the signal up to a voltage so that the input signal is never within 100mV of
the rails or use the
Auxiliary ADC which features single-ended inputs.