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SPC560P54x bảng dữ liệu(PDF) 75 Page - STMicroelectronics |
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SPC560P54x bảng dữ liệu(HTML) 75 Page - STMicroelectronics |
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75 / 105 page ![]() DocID18340 Rev 6 75/105 SPC56xP54x, SPC56xP60x Electrical characteristics 104 Figure 15. ADC characteristics and error definitions 3.15.1 Input impedance and ADC accuracy 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 attenuate the noise present on the input pin; further, 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 source impedance value of the transducer or circuit supplying the analog signal to be measured. (2) (1) (3) (4) (5) Offset Error OSE Offset Error OSE Gain Error GE 1 LSB (ideal) Vin(A) (LSBideal) (1) Example of an actual transfer curve (2) The ideal transfer curve (3) Differential non-linearity error (DNL) (4) Integral non-linearity error (INL) code out 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 LSB ideal = VDD_ADC / 1024 |
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