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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC560B64x датащи(PDF) 97 Page - STMicroelectronics |
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SPC560B64x датащи(HTML) 97 Page - STMicroelectronics |
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97 / 133 page  DocID15131 Rev 9 97/133 SPC560B54x/6x Electrical characteristics 132 Figure 16. ADC_0 characteristic and error definitions 4.17.2 Input impedance and ADC accuracy In the following analysis, the input circuit corresponding to the precise channels is considered. To preserve the accuracy of the A/D converter, it is necessary that analog input pins have low AC impedance. Placing a capacitor with good high frequency characteristics at the input pin of the device can be effective: the capacitor should be as large as possible, ideally infinite. This capacitor contributes to attenuating the noise present on the input pin; furthermore, it sources charge during the sampling phase, when the analog signal source is a high-impedance source. A real filter can typically be obtained by using a series resistance with a capacitor on the input pin (simple RC filter). The RC filtering may be limited according to the value of source (2) (1) (3) (4) (5) Offset Error (EO) Offset Error (EO) Gain Error (EG) 1 LSB (ideal) 1023 1022 1021 1020 1019 1018 5 4 3 2 1 0 7 6 1 2 3 4 5 6 7 1017 1018 1019 1020 1021 1022 1023 (1) Example of an actual transfer curve (2) The ideal transfer curve (3) Differential non-linearity error (DNL) (4) Integral non-linearity error (INL) (5) Center of a step of the actual transfer curve 1 LSB ideal = VDD_ADC / 1024 Vin(A) (LSBideal) code out |
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