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M0 Analog-Digital Conversion info needed

I have had a remarkable lack of success trying to locate information about the M0 ADC.  I need to know

  • The capacitor value, in nf or pf
  • The duration of the "sampling aperture"
  • The min/typ/max power required to get a valid sample

I want to create a voltage divider network that drops the sampled voltage down to the 0-1.0V requirement, that consumes minimum power while still giving the capacitor time to charge.  The one circuit I've found consumes 20mA; if possible, I'd like to create one that reduces this to single-digit uA or better still, nA. But to do this, I need the resulting RC circuit to be able to charge the capacitor in, say, 80% of the sampling aperture time 

To be more precise, I need this data for an Atmel SAMD21 chip

     joe

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