HD6432345 Datasheet, PDF (534/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

Table 14.6 Analog Pin Specifications
Item
Min
Analog input capacitance
—
Permissible signal source impedance
—
Note: * When V_CC = 4.0 V to 5.5 V and ø ≤ 12 MHz
Max
Unit
20
pF
10*
kΩ
AN0 to
AN7
10 kΩ
To A/D
converter
20 pF
Note: Values are reference values.
Figure 14.8 Analog Input Pin Equivalent Circuit
A/D Conversion Precision Definitions: H8S/2345 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'000) to
B'0000000001 (H'001) (see figure 14.10).
• 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'3FE) to B'1111111111 (H'3FF) (see
figure 14.10).
• Quantization error
The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 14.9).
• 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.
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