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Giải thích chi tiết về linh kiện  How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices
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AN2834
How to get the best ADC accuracy
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3.2.7
Source frequency condition vs. source and parasitic capacitors
The external capacitance will not allow the analog input voltage to be exactly the same as
VAIN if the capacitor is not fully charged by the analog source.
If the analog input signal changes, then the analog signal frequency (FAIN) should be such
that the time period of this analog signal is at least: 10 × RAIN × (CAIN + Cp).
TAIN = analog signal time period = 1/FAIN.
We have:
Therefore:
For example:
For RAIN = 25 k, CAIN = 7 pF, Cp = 3 pF, this gives:
Thus, the maximum frequency of the source will be:
.
So for the above defined source characteristics (capacitance and resistance), the frequency
of the source must not exceed 400 kHz, otherwise the ADC conversion result will be not
accurate.
Figure 26. Recommended values for RAIN and CAIN vs. source frequency FAIN
TAIN 10 RAIN CAIN CP
+

FAIN
1
10 RAIN CAIN CP
+

---------------------------------------------------------------------
FAINmax
1
10 25 10
3
73
+
 10
12
–
----------------------------------------------------------------------------------
=
FAINmax 400 kHz
=
0.1
1
10
100
1000
0.01
0.1
1
10
FAIN(kHz)
CAIN 10 nF
CAIN 22 nF
CAIN 47 nF
ai15489



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