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SH7721 Datasheet(PDF) 1012 Page - Renesas Technology Corp

Part # SH7721
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  1524 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7721 Datasheet(HTML) 1012 Page - Renesas Technology Corp

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Section 27
A/D Converter
Rev. 3.00
Jan. 18, 2008
Page 950 of 1458
REJ09B0033-0300
27.7.7
Notes on Countermeasures to Noise
Connect a protective circuit between AVcc and AVss, as shown in figure 27.9, to prevent damage
of analog input pins (AN0 to AN3) due to abnormal voltage such as excessive serge. Connect a
bypass capacitor that is connected to AVcc and a capacitor for a filter that is connected to AN0 to
AN3 to AVss.
When a capacitor for a filter is connected, input currents of AN0 to AN3 are averaged, may
causing errors. If A/D conversion is frequently performed in scan mode, voltages of analog input
pins cause errors when a current that is charged/discharged for capacitance of a sample & hold
circuit in the A/D converter is higher than a current that is input through input impedance (Rin).
Therefore, determine a circuit constant carefully.
0.01
µF
10
µF
AVCC (A/D)
AN0 to AN3
AVSS (A/D)
This LSI
*1
100
Ω
0.1
µF
Notes: *1 Values are for reference.
R
in*
2
*2 R
in is input impedance.
Figure 27.9
Example of Analog Input Protection Circuit
Table 27.5
Analog Input Pin Ratings
Item
Min
Max
Unit
Analog input capacitance
20
pF
Allowable signal-source impedance
5
k
Ω



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