Binary related ADC reference voltage?

Discussion in 'General Electronics Chat' started by Veracohr, Apr 12, 2016.

  1. Veracohr

    Thread Starter Well-Known Member

    Jan 3, 2011
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    In looking through the datasheet for the MAX11100 ADC I noticed that it's spec'd with a 4.096V analog reference, which sets the input voltage range. Is there some benefit to an ADC input range being related to a binary value (2^12)?
     
  2. crutschow

    Expert

    Mar 14, 2008
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    Yes, it can simplify any subsequent math used to process the signal.
    A 12 bit converter has 4096 steps making 1 LSB exactly equal to 1 mV for a 4.096V reference voltage.
     
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  3. Veracohr

    Thread Starter Well-Known Member

    Jan 3, 2011
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    That sounds like it simplifies characterizing the device, but for normal use? Why would it matter if 1 LSB is 1.000mV or 1.1mv? Either way it's the same digital output value.
     
  4. crutschow

    Expert

    Mar 14, 2008
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    In some applications is convenient to have have 1LSB equal to a nice even voltage.
    If that doesn't matter to you then don't worry about it. :rolleyes:
     
  5. Veracohr

    Thread Starter Well-Known Member

    Jan 3, 2011
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    OK, I was just curious. Thanks.
     
  6. cmartinez

    AAC Fanatic!

    Jan 17, 2007
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    It's far easier perform calculations when interfacing an ADC referenced to that voltage to an MCU. Especially when dealing with assembly code and when very fast conversion rates are needed.
     
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