Renesas HD6417641 - Figure 21.7 Example of Analog Input Protection Circuit; Figure 21.8 Analog Input Pin Equivalent Circuit; Figure 21.9 Example of Analog Input Circuit

Section 21 A/D Converter
Rev. 4.00 Sep. 14, 2005 Page 817 of 982
REJ09B0023-0400
0.01 µF
10 µF
AV
CC
AN0 to AN7
AV
SS
This LSI
*
1
1.
100 Ω
0.1 µF
Note: Value are referene value.
*
2
R
in
2. R
in
: input impedance
Figure 21.7 Example of Analog Input Protection Circuit
AN0 to AN7
3 kΩ
20 pF
to A/D converter
Note: Value are referene value.
Figure 21.8 Analog Input Pin Equivalent Circuit
Sensor input
This LSI
Sensor output impeddance
Low-pass filter
C to 0.1 µF
Up to 3 kΩ
Cin =
15pF
20pF
3 kΩ
Note: Value are referene value.
A/D converter
equivalent circuit
Figure 21.9 Example of Analog Input Circuit