767
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.
A/D converter
equivalent circuit
H8S/2633 Series
20 pF
C
in
=
15 pF
10 k
Ω
to 5 k
Ω
Low-pass
filter
C to 0.1
µ
F
Sensor output
impedance
Sensor input
Figure 19-11 Example of Analog Input Circuit