Datasheet

Section 14 A/D Converter (8 Analog Input Channel Version)
Rev.7.00 Feb. 14, 2007 page 549 of 1108
REJ09B0089-0700
frequently, as in scan mode, if the current charged and discharged by the capacitance of the
sample-and-hold circuit in the A/D converter exceeds the current input via the input impedance
(R
in
), an error will arise in the analog input pin voltage. Careful consideration is therefore
required when deciding the circuit constants.
AV
CC
*1 *1
V
ref
AN0 to AN7
AV
SS
Notes: Values are reference values.
1.
2 . R
in
: Input impedance
R
in
*2
100 Ω
0.1 μF
0.01 μF10 μF
Figure 14.7 Example of Analog Input Protection Circuit