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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  • Hey Joe,

    in Your endeavours to find an answer, you didn't by any chance have a look at the SAMD21 datasheet, did You?
    Page 955, Chapter 36.9.4 of the SAMD21 datasheet has all the info about the SAMD21's ADC electrical characteristics,
    Just out of curiosity though, what made You think in the first place, that this could have anything to do with the ARM Cortex M0 since you are talking about a peripheral component in an Atmel/Microchip implementation?


    Sebastian 

Reply
  • Hey Joe,

    in Your endeavours to find an answer, you didn't by any chance have a look at the SAMD21 datasheet, did You?
    Page 955, Chapter 36.9.4 of the SAMD21 datasheet has all the info about the SAMD21's ADC electrical characteristics,
    Just out of curiosity though, what made You think in the first place, that this could have anything to do with the ARM Cortex M0 since you are talking about a peripheral component in an Atmel/Microchip implementation?


    Sebastian 

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