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ADC INL unit ppm vs ppm of FSR ?

Question asked by Rajeshkaliyaperumal on Dec 13, 2017
Latest reply on Dec 21, 2017 by jcolao

Hi ,

 

I am working on the calculation of DC performance for the ADCs .
In analog devices sigma Delta ADC datasheets, Integral Non Linearity (INL) is given in the unit of ppm of FSR whereas in SAR ADC datasheets INL is specified in the unit of ppm.
How do i calculate the total error due to INL for a particular ADC and compare it for those ADCs?
Is the above calculation is correct ?
For Example,
I have taken 5 volts as reference voltage of ADC for calculation.
If the INL is 3 ppm , I have taken total error due to INL as 15uV (=3uV*5)
If the INL is 3 ppm of FSR, I have taken total error due to INL as 3uV (as it is given in ppm of FSR)
Thanks & Regards,
Rajesh K

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