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HD64F2149YV bảng dữ liệu(PDF) 707 Page - Renesas Technology Corp

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Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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Section 20 A/D Converter
Rev. 3.00 Jan 18, 2006 page 679 of 1044
REJ09B0280-0300
If a filter capacitor is connected as shown in figure 20.7, the input currents at the analog input pins
(AN0 to AN7) 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.
AVCC
*1
AVref
AN0 to AN7
AVSS
Notes:
Figures are reference values.
1.
2. Rin: Input impedance
*1
Rin*2
100
Ω
0.1 µF
0.01 µF
10 µF
Figure 20.7 Example of Analog Input Protection Circuit
Table 20.5
Analog Pin Ratings
Item
Min
Max
Unit
Analog input capacitance
—
20
pF
Permissible signal source impedance
—
5*
k
Ω
Note:
*
When V
CC= 2.7 to 3.6 V and φ ≤ 10 MHz.



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