D12320VF25V Datasheet, PDF (583/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 14 A/D Converter (8 Analog Input Channel Version)
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.
*1
*1
R_in^*2
100 Ω
0.1 μF
Notes: Values are reference values.
1.
10 μF
0.01 μF
AV_CC
V_ref
AN0 to AN7
AV_SS
2 . R_in: Input impedance
Figure 14.7 Example of Analog Input Protection Circuit
Rev.7.00 Feb. 14, 2007 page 549 of 1108
REJ09B0089-0700