HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 477

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

5. Notes on noise countermeasures
Table 14.5 Analog Pin Specifications
Item
Analog input capacitance
Permissible signal source impedance
A protection circuit connected to prevent damage due to an abnormal voltage such as an
excessive surge at the analog input pins (ANn) and analog reference voltage (AV
connected between AV
Also, the bypass capacitors connected to AV
ANn must be connected to AV
input currents at the analog input pins (ANn) are averaged, and so an error may arise. Careful
consideration is therefore required when deciding the circuit constants.
Notes:
*1
1.
2. R
*1
Figure 14.8 Example of Analog Input Pin Protection Circuit
in
10 F
: Input impedance
R
in
*2
CC
and AV
100
SS
. If a filter capacitor is connected as shown in figure 14.8, the
0.01 F
SS
as shown in figure 14.8.
0.1 F
CC
and AV
Min
—
—
AV
AV
AN0–AN15
AV
Rev. 5.00 Jan 06, 2006 page 457 of 818
CC
ref
SS
ref
and the filter capacitor connected to
Max
20
3
Section 14 A/D Converter
SH7050
REJ09B0273-0500
Unit
pF
k
ref
) should be