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Influences on Absolute Precision: Adding capacitance results in coupling with GND, and
therefore noise in GND may adversely affect absolute precision. Be sure to make the connection
to an electrically stable GND such as AVSS.
Care is also required to insure that filter circuits do not communicate with digital signals on the
mounting board, so acting as antennas.
Sensor output
impedance
to 5 kΩ
Sensor input
Low-pass
filter
C to 0.1 µF
Figure 19-11 Example of Analog Input Circuit
H8S/2633 Series
C
=
in
15 pF
A/D converter
equivalent circuit
10 kΩ
20 pF
767
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