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MPC5604B датащи(PDF) 52 Page - Freescale Semiconductor, Inc

номер детали MPC5604B
подробное описание детали  MPC5604B/C Microcontroller Data Sheet
PDF  72 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC5604B датащи(HTML) 52 Page - Freescale Semiconductor, Inc

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MPC5604B/C Microcontroller Data Sheet Data Sheet, Rev. 4
Electrical characteristics
Freescale Semiconductor
52
4.18.5
ADC electrical characteristics
4.18.5.1
Introduction
The device provides a 10-bit Successive Approximation Register (SAR) analog-to-digital converter.
Figure 26. ADC characteristic and error definitions
4.18.5.2
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.
(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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