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ADC104S021Q-Q1: ADC value Error

tad he
Prodigy 10 points
Part Number: ADC104S021Q-Q1

 IC: ADC104S021Q-Q1  (error parameters  DNL=+/-0.4，INL=-0.4...+0.3，offset error=+/-0.4.  FSE=+/-0.7)

when  ADC104S021Q-Q1   convert an analog singal to ADC，wo can get the typical ADC value，but how can i calculate the max /min value of the ADC;

for example,Vref=5V，input analog=2.5V，then the typical ADC=512，if  ADC-max=512+(DNL+INL+offset error+FSE)，ADC-min=512-(DNL+INL+offset error+FSE);

then the ADC value will be a decimal？

  • 0
    TI__Mastermind 24940 points

    hello,

    I am no sure if I understand your question.

    1. If you are trying to evaluate the Total Error of the ADC, then I suggest reading the following blog: Total Unadjusted Error Explained. This explains the impacts of the various errors of the ADC to the measurement. Note that this is a 3 part blog, I only referred to the second part as it relates directly.

    2. If you are asking how to convert the ADC binary output to a decimal equivalent. 

    For binary number with n digits:

    dn-1 ... d3 d2 d1 d0

    The decimal number is equal to the sum of binary digits (dn) times their power of 2 (2n):

    decimal = d0×20 + d1×21 + d2×22 + ...

    To then convert the decimal output to the measured voltage

    Output voltage = Va/2048 * Decimal value

    Regards

    Cynthia