Renesas H8S/2318 series, Руководство по оборудованию

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Rev. 5.00, 12/03, page 535 of 1088
(R
in
), an error will arise in the analog input pin voltage. Careful consideration is therefore
required when deciding the circuit constants.
AV
CC
*
1
*
1
V
ref
AN0 to AN7
AV
SS
Notes: Values are reference values.
1.
2 . R
in
: Input impedance
R
in
*
2
100
Ω
0.1
µ
F
0.01
µ
F 10
µ
F
Figure 14-7 Example of Analog Input Protection Circuit
A/D Conversion Precision Definitions: The chip’s A/D conversion precision definitions are
given below.
•
Resolution
The number of A/D converter digital output codes.
•
Offset error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic
when the digital output changes from the minimum voltage value B'0000000000 to
B'0000000001 (see figure 14-9).
•
Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic
when the digital output changes from B'1111111110 to B'1111111111 (see figure 14-9).