SH7261 Datasheet, PDF (1066/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 22 A/D Converter (ADC)
22.7.4 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 22.8. 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 22.9 shows an equivalent circuit diagram of the analog input ports and table 22.7 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 22.8 Example of Analog Input Protection Circuit
Rev. 2.00 Sep. 07, 2007 Page 1034 of 1312
REJ09B0320-0200