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SPC560P54x Datasheet(PDF) 75 Page - STMicroelectronics

No. de pieza SPC560P54x
Descripción Electrónicos  32-bit Power Architecture® based MCU with 1088KB Flash memory and 80KB RAM for automotive chassis and safety applications
PDF  105 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPC560P54x Datasheet(HTML) 75 Page - STMicroelectronics

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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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