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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN1711 датащи(PDF) 24 Page - STMicroelectronics |
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AN1711 датащи(HTML) 24 Page - STMicroelectronics |
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24 / 40 page  24/40 SOFTWARE TECHNIQUES FOR COMPENSATING ST7 ADC ERRORS 4 CALIBRATING THE ADC 4.1 CALIBRATION ISSUES 1. If calibration is done on a single channel of the device, the calibration constant is applicable to all the channels. 2. The ADC conversion errors cannot vary from one channel to another unless the source re- sistance of any of the analog inputs is different, causing a different voltage drop across the source resistance. The RAIN (max) value is provided in the ADC electrical characteristics section of the datasheet. 3. Because of positive offset errors and negative gain errors, the actual range of analog input voltage range will be reduced. The ADC cannot be calibrated outside this range. Figure 14. 10-bit ADC Calibration Overview 4.2 CALIBRATION METHODS The ADC can be calibrated using a known source so as to get accurate results. 4.2.1 Use accurate voltage reference This is a simple way to calibrate the ADC. A known reference voltage is connected to a free analog input channel and converted. The digital output received after the conversion can be compared to the already known correct value. The correction factor is then used to correct all other the digital values. Correction factor = known expected value/Actual value VSSA 1023 Digital output (Decimal steps) Actual transfer curve Ideal transfer curve Vin Reduced Range Ideal range Gain error (negative) Offset Error (positive) Uncalibrated range Uncalibrated range |
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