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| AN2658 Datasheet, PDF (16/23 Pages) STMicroelectronics – Using the analog to digital converter of the STM8S microcontroller | |||
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Practical application
Figure 9. External preamplifier usage (with high impedance input)
UIN
+
-
AINx
R1
R2
VREF-
VSS
STM8
AN2658
Figure 10. Differential DC signal measurement with preamplifier
R2
-
UIN
R1
+
R3
R4
AINx
VREF-
VSS
STM8
Figure 11. AC signal (FFT) measurement
UIN
DC
AINx
filter
VREF-
VSS
STM8
16/23
Doc ID 14152 Rev 2
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