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AN3137 датащи(PDF) 18 Page - STMicroelectronics

номер детали AN3137
подробное описание детали  Analog-to-digital converter on STM8L and STM8AL devices
PDF  42 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3137 датащи(HTML) 18 Page - STMicroelectronics

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ADC errors
AN3137
18/42
Doc ID 16983 Rev 3
Figure 9.
Offset and gain error
3.5
Hardware design errors
3.5.1
External resistance design error
The input multiplexer has a nonzero impedance (Rmpx). Sampling is done by switch which
has also a nonzero impedance (Rsw). Both impedances, together with the sampling
capacitance (Csamp = typ. 16 pF; see datasheet) and external signal source resistance
(Rext), create a low pass filter. Therefore the external signal source impedance (Rext) must
be designed so that this low pass filter cut-off frequency will not be too low in relation to the
ADC sampling time (tS = 4 ... 384 ADC clocks).
R
sw
R
mpx
R
ext
++
() C
samp
⋅
t
s
«
Figure 10.
Analog input circuit



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