ADC and time resolution

Discussion in 'The Projects Forum' started by Highlight, Jun 18, 2011.

  1. Highlight

    Thread Starter New Member

    Nov 26, 2010
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    If it takes my ADC 2us to convert a sample does that mean my time resolution on the data is also 2us??
     
  2. MrCarlos

    Active Member

    Jan 2, 2010
    400
    134
    Hi Highlight

    No resolution means how many bits of the ADC output.

    cordially
    at your service
     
  3. Highlight

    Thread Starter New Member

    Nov 26, 2010
    28
    0
    But isnt the number of bits relevant only for the "amplitude" of the signal??...what about the time scale?
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    Conversion time will give you the minimum sampling period, that is, the time between samples cannot be shorter than 2us.
    Your actual time resolution will depend on the inverse of your sampling rate. For example, if you sample at 50K sps your time resolution will be 20us.

    On top of that you have to take into account something called "sampling jitter".
     
  5. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,387
    1,605
    Do you need to sample the signal before you convert it? Add that time.

    Does your signal need time to stabilize after you switch to measure it? Add that time.

    Does your micro need time to process the reading results before it can start another measurement? Add that time.

    These are a few of the other things you may need to consider in getting your sampling rate.
     
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