mpc5602d Freescale Semiconductor, Inc, mpc5602d Datasheet - Page 52

• Manufacturer Part Number: mpc5602d
• Description: Mpc5602d Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

Electrical characteristics
4.17
4.17.1
The device provides a 12-bit Successive Approximation Register (SAR) analog-to-digital converter.
4.17.2
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
52
ADC electrical characteristics
code out
Introduction
Input impedance and ADC accuracy
1023
1022
1021
1020
1019
1018
Offset Error OSE
7
6
5
4
3
2
1
0
1
Figure 11. ADC characteristic and error definitions
2
Preliminary—Subject to Change Without Notice
MPC5602D Microcontroller Data Sheet, Rev. 3.1
3
4
1 LSB (ideal)
5
6
(4)
(3)
7
(2)
(5)
V
1017 1018 1019 1020 1021 1022 1023
in(A)
(LSB
ideal
(1)
(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
Offset Error OSE
)
1 LSB ideal = V
DD_ADC
Gain Error GE
Freescale Semiconductor
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