Hitachi F-ZTAT H8/3039 Series Hardware Manual page 441

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 AV
Care is also required to insure that filter circuits do not communicate with digital signals on the
mounting board, thus acting as antennas.
Sensor output
impedance
to 10 k Ω
Sensor input
Low-pass
filter
C to 0.1 µF
Note: Values are reference values.
432
.
SS
Figure 13-11 Example of Analog Input Circuit
H8/3039 Series
A/D converter
equivalent circuit
C =
in
15 pF
10 kΩ
20 pF