HD64F2149YV datasheet(707/1075 Pages) RENESAS

部品番号	HD64F2149YV

部品情報	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1075 Pages

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メーカー	RENESAS [Renesas Technology Corp]

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707 / 1075 page

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

in), an error will arise in the analog input pin voltage. Careful consideration is therefore required

when deciding the circuit constants.

AVCC

AVref

AN0 to AN7

AVSS

Notes:

Figures are reference values.

2. Rin: Input impedance

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

—

Permissible signal source impedance

—

Ω

Note:

When V

CC= 2.7 to 3.6 V and φ ≤ 10 MHz.

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