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H8/3021 Datasheet(PDF) 460 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 460 Page - Renesas Technology Corp |
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460 / 712 page  13. A/D Converter Rev.2.00 Mar. 22, 2007 Page 436 of 684 REJ09B0352-0200 If a filter capacitor is connected as shown in figure 13.7, the input currents at the analog input pins (AN 0 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.Therefore careful consideration is required when deciding the circuit constants. AVCC *1 AN0 to AN7 AVSS Notes: Values are reference values. 1. 2. Rin: Input impedance Rin*2 100 Ω 0.1 µF 0.01 µF 10 µF Figure 13.7 Example of Analog Input Protection Circuit |
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