SH7055S Datasheet, PDF (653/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Also, the bypass capacitors connected to AV_CC and AV_ref and the filter capacitor connected to
ANn must be connected to AV_SS. If a filter capacitor is connected as shown in figure 17.9, the
input currents at the analog input pins (ANn) are averaged, and so an error may arise. Careful
consideration is therefore required when deciding the circuit constants.
*1 *1
R_in^*2
100 Ω
0.1 µF
AV_CC
AV_ref
AN0–NAN31
AV_SS
SH7055SF
Notes: *1
10 µF
0.01 µF
*2 R_in: Input impedance
Figure 17.9 Example of Analog Input Pin Protection Circuit
Table 17.5 Analog Pin Specifications
Item
Analog input capacitance
Permissible signal source impedance
Min
Max
Unit
—
20
pF
—
3
kΩ
Rev.2.0, 07/03, page 615 of 960