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AN1711 データシート(PDF) 33 Page - STMicroelectronics

部品番号 AN1711
部品情報  SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS
PDF  40 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1711 データシート(HTML) 33 Page - STMicroelectronics

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SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS
Figure 21. Illustration of calibration
4.2.7 Calibration for Errors using 2 different zones
We can extend the technique mentioned above to do 2-zone calibration. This is required be-
cause of the linear distribution of errors from offset error to mid-voltage and then from mid-
voltage to gain error as shown in Figure 22.
Figure 22. Calibration for 2 zones
In addition to approximate Offset and Gain errors we need to calculate the error around the
center of the analog voltage range. A small voltage range around mid-voltage is to be ignored
Recorded
value
Calibrated
value
VSSA
1023
Digital
output
(Decimal
steps)
Actual
transfer curve
Ideal
transfer curve
Vin
Ideal range
Gain error (negative)
Offset
Error (positive)
509
517
**Graph not to scale
uncalibrated
range



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