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AN2834 датащи(PDF) 17 Page - STMicroelectronics

номер детали AN2834
подробное описание детали  How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices
PDF  45 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN2834 датащи(HTML) 17 Page - STMicroelectronics

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AN2834
ADC errors
44
Figure 15. Analog signal source resistance effect
1. tc is the time taken by the CADC capacitor to fully charge: Vc = VAIN (with max.1/2 lsb error)
Vc: capacitor (CADC) voltage
tc = (RADC + RAIN) × CADC
2.2.7
Effect of source capacitance and parasitic capacitance of the PCB
When converting analog signals, it is necessary to account for the capacitance at the source
and the parasitic capacitance seen on the analog input pin (refer to Figure 16). The source
resistance and capacitance form an RC network and the ADC conversion results may not be
accurate unless the external capacitor (CAIN + Cp) is fully charged to the level of the input
voltage. The greater value of (CAIN + Cp), the more limited the source frequency.
The external capacitance at the source and the parasitic capacitance are denoted by CAIN
and Cp, respectively.
Figure 16. Analog input with RAIN, CAIN and Cp
STM32
RADC
CADC
VSSA
AINx
RAIN
VAIN
Vc
VAIN
Vc
tc
t
12-bit ADC
ai15482
STM32
AINx
RAIN
VAIN
ai15483
CAIN
CP
Source



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