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SPC560D30L3 bảng dữ liệu(PDF) 56 Page - STMicroelectronics

tên linh kiện SPC560D30L3
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Electrical characteristics
SPC560D30x, SPC560D40x
56/82
DS6494 Rev 8
Figure 11. ADC characteristics 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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