Datasheet

Section 16 A/D Converter (8 Analog Input Channel Version)
Rev.6.00 Sep. 27, 2007 Page 722 of 1268
REJ09B0220-0600
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
SS
.
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
Chip
20 pFC
in
= 15 pF
10 kΩ
Low-pass
filter C
to 0.1 µF
Sensor output
impedance
Max. 5 kΩ
Sensor input
Note: Values are reference values.
Figure 16.10 Example of Analog Input Circuit