ADC104S021Q-Q1: ADC value Error

tad he

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？

over 5 years ago

0 Cynthia over 5 years ago

TI__Mastermind 24970 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:

d_n-1 ... d₃ d₂ d₁ d₀

The decimal number is equal to the sum of binary digits (d_n) 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

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ADC104S021Q-Q1: ADC value Error