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ADC121C021: Datasheet Clarification - Power Supply noise

Michael T Schneider
Expert 3780 points
Part Number: ADC121C021

Team, 

Page 5:

 See note (1) below:

 Our engineer is trying to analyze filter (L-C) for the power supply (VA), and does not know how to define “pass/fail” criteria. As There is no power supply that is “free of noise”, How would a user defined “well bypassed”? can we provide a general quantitative guideline for this spec? 

  • 0
    TI__Mastermind 24970 points

    Hello,

    This usually is indicating that correct bypass capacitors are used and placed close to the device. 

    In this case, the datasheet states that VA should have a 0.1uF and a 4.7uF bypass capacitors

    If you are looking for a quantitative value for noise, I would suggest limiting to the noise to less than a LSB of your system.

    This is based on the full scale range you are using. 

    LSB = FSR/2^12

    Regards

    Cynthia