HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 888

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 17 A/D Converter
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
the analog input pin voltage. Careful consideration is therefore required when deciding the circuit
constants.
Table 17.6 Analog Pin Specifications
Item
Analog input capacitance
Permissible signal source impedance
Rev.7.00 Mar. 18, 2009 page 820 of 1136
REJ09B0109-0700
Notes:
*
1
Values are reference values.
1.
2. R
*
1
10 µF
in
: Input impedance
Figure 17.7 Example of Analog Input Protection Circuit
R
in
*
2
0.01 µF
100Ω
0.1 µF
Min
—
—
AV
Vref
AN0 to AN15
AV
CC
SS
20
Max
10
in
), an error will arise in
Unit
pF
kΩ