HD6473032F16 Datasheet, PDF (571/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 15 A/D Converter
5. Effect on Absolute Accuracy
Attaching an external capacitor creates a coupling with ground, so if there is noise on the
ground line, it may degrade absolute accuracy. The capacitor must be connected to an
electrically stable ground, such as AV_SS.
If a filter circuit is used, be careful of interference with digital signals on the same board, and
make sure the circuit does not act as an antenna.
Sensor output impedance
Up to 10 kΩ
Sensor
input
Low-pass
filter
C to 0.1 µF
H8/3052BF
Cin =
15 pF
Equivalent circuit of
A/D converter
10 kΩ
20 pF
Figure 15.11 Analog Input Circuit (Example)
Rev. 3.00 Mar 21, 2006 page 541 of 814
REJ09B0302-0300