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AN3137 bảng dữ liệu(PDF) 34 Page - STMicroelectronics

tên linh kiện AN3137
Giải thích chi tiết về linh kiện  Analog-to-digital converter on STM8L and STM8AL devices
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AN3137 bảng dữ liệu(HTML) 34 Page - STMicroelectronics

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Methods for precision improvement
AN3137
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Doc ID 16983 Rev 3
Figure 19.
Parasitic capacitances of sampling switch
This charging and discharging currents (PMOS and NMOS asymmetric capacitances) can
cause charge transfer to sampling capacitor Csh.
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 20)
●
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 20.
Parasitic current example inside ADC structure



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