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AN2834 Datasheet(PDF) 42 Page - STMicroelectronics

Part # AN2834
Description  How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2834 Datasheet(HTML) 42 Page - STMicroelectronics

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How to get the best ADC accuracy
AN2834
42/45
DocID15067 Rev 2
Internal charging of sampling capacitor
It is possible that after the conversion process (successive approximation process in SAR
type of ADC) the sample and hold capacitor Csh is charged to some voltage. The reason
can be:
some leakage current to Csh (parasitic current inside ADC structure, see Figure 39)
residual charge transfer from the switches when ADC structure is switched back to
default state before next conversion
other reasons (related to internal ADC parasitic structures)
Figure 39. Parasitic current example inside ADC structure
Csh
S1
Rparasitic
ADC input
ai17911



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