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SPC56AP54X 数据表(PDF) 75 Page - STMicroelectronics

部件名 SPC56AP54X
功能描述  32-bit Power Architecture® based MCU with 1088 KB Flash memory and 80 KB RAM for automotive chassis and safety applications
PDF  104 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

SPC56AP54X 数据表(HTML) 75 Page - STMicroelectronics

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SPC56xP54x, SPC56xP60x
Electrical characteristics
Doc ID 18340 Rev 3
75/104
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)
(5) Center of a step of the actual transfer curve
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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