Datasheet

Section 19 A/D Converter
Rev. 4.00 Jun 06, 2006 page 569 of 1004
REJ09B0301-0400
(R
in
), an error will arise in the analog input pin voltage. Careful consideration is therefore required
when deciding the circuit constants.
AVCC
*
1
AN0 to AN7
AVSS
Notes: Figures are reference values.
1.
2. R
in
: Input impedance
R
in
*
2
100 Ω
0.1 µF
0.01 µF10 µF
Figure 19.7 Example of Analog Input Protection Circuit
Table 19.5 Analog Pin Specifications
Item Min Max Unit
Analog input capacitance — 20 pF
Permissible signal source impedance — 10
*
kΩ
Note: * When V
CC
= 4.0 V to 5.5 V and φ ≤ 12 MHz
20 pF
To A/D
converter
AN0 to
AN7
10 kΩ
Note: Values are reference values.
Figure 19.8 Analog Input Pin Equivalent Circuit