SH7205 Datasheet, PDF (1088/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 21 A/D Converter (ADC)
21.7.4 Processing of Analog Input Pins
To prevent damage from voltage surges at the analog input pins (AN0 to AN7), connect an input
protection circuit like the one shown in figure 21.8. The circuit shown also includes a CR filter to
suppress noise. This circuit is shown as an example; the circuit constants should be selected
according to actual application conditions.
Figure 21.9 shows an equivalent circuit diagram of the analog input ports and table 21.7 lists the
analog input pin specifications.
*¹ *¹
*^{2 Rin}
100 Ω
0.1 µF
AVcc
AVref
AN0 to AN7
AVss
This LSI
Notes: Values are reference values.
1.
10 µF
0.01 µF
2. R_in: Input impedance
Figure 21.8 Example of Analog Input Protection Circuit
Rev. 1.00 Mar. 25, 2008 Page 1056 of 1868
REJ09B0372-0100