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17.6
A/D Conversion Accuracy Definitions
This LSI’s A/D conversion accuracy definitions are given below.
•
Resolution
The number of A/D converter digital output codes
•
Quantization error
The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 17.4).
•
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 17.5).
•
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 17.5).
•
Nonlinearity error
The error with respect to the ideal A/D conversion characteristic between zero voltage and full-
scale voltage. Does not include offset error, full-scale error, or quantization error (see figure
17.5).
•
Absolute accuracy
The deviation between the digital value and the analog input value. Includes offset error, full-
scale error, quantization error, and nonlinearity error.
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