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AN2834 Scheda tecnica(PDF) 42 Page - STMicroelectronics

Il numero della parte AN2834
Spiegazioni elettronici  How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices
PDF  45 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2834 Scheda tecnica(HTML) 42 Page - STMicroelectronics

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How to get the best ADC accuracy
AN2834
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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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