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Table 19-7 Analog Pin Specifications
Item
Analog input capacitance
Permissible signal source impedance
Note: Values are reference values.
A/D Conversion Precision Definitions: H8S/2633 Series 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 (H'00) to
B'0000000001 (H'01) (see figure 19-10).
• 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 (H'3E) to B'1111111111 (H'3F) (see
figure 19-10).
• Quantization error
The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 19-9).
• Nonlinearity error
The error with respect to the ideal A/D conversion characteristic between the zero voltage and
the full-scale voltage. Does not include the offset error, full-scale error, or quantization error.
• Absolute precision
The deviation between the digital value and the analog input value. Includes the offset error,
full-scale error, quantization error, and nonlinearity error.
764
AN0 to AN15
Figure 19-8 Analog Input Pin Equivalent Circuit
Min
—
—
10 kΩ
To A/D converter
20 pF
Max
Unit
20
pF
5
kΩ
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