Rev. 1.00, 09/03, page 522 of 704
If a filter capacitor is connected, the input currents at the analog input pins (AN0 to AN15) are
averaged, and so an error may arise. Also, when A/D conversion is performed 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
Vref
AN0 to AN15
AV
SS
Notes:
Values are reference values.
1.
2. R
in
: Input impedance
R
in
*
2
100
0.1 µF
0.01 µF
10 µF
Figure 18.7 Example of Analog Input Protection Circuit
Table 18.6 Analog Pin Specifications
Item Min.
Max.
Unit
Analog input capacitance
—
20
pF
Permissible signal source impedance
—
5
k
Ω
Summary of Contents for H8S/2437
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