Part Number: ADS124S06
I would like to ask you a basic question about "Calibration".
There are 2 calibration mode on the device : self and system.
I understand the meaning of "system" calibration but I do not understand well about "self".
I suppose that "self" calibration is not necessary for us...
Will you tell me how/when to use self calibration?
Thank you for your kind support.
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In reply to Bob Benjamin:
I would like to ask you more questions, please.
1) Why do not you prepare "self-Gain calibration"?
Or "INL" includes "Gain error", correct?
2) Will you teach me the relation between INL and Gain error?
I am still confusing the meaning of INL.
Sorry for my basic questions but I appreciate your kind support.
In reply to Takumi Suzuki1:
As I mentioned in my previous response, there is no self-gain calibration because the ADS124S06 is factory trimmed for each of the PGA gain settings. In other words, the gain is already calibrated for the device. System gain calibration would take into account the gain error of devices outside of the ADC such as the sensor, amplifier, etc. and would correct for the total system gain error.
Gain error is the difference of the actual output slope relative to the ideal and is most pronounced at full-scale.
If the gain is corrected by calibration (either by system calibration of factory calibration) so that the endpoints match the ideal, then the INL error is the maximum deviation from the ideal slope. If the gain error is uncorrected, then you need to do a RSS of all the error sources. So the gain error is the shift of the linear slopes and the INL error is the deviation at the maximum point.
Another way to think of it is the gain error is the shift in the slope of two linear lines and the INL error is the deviation similar to a curve (or how closely the ADC fits the ideal response) from the ideal linear line.
Thank you so much for your kind reply and I am very sorry that I failed to notice your previous reply.
I understood well.
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