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22.6
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 22.3).
•
Offset error
The deviation of the analog input voltage value from the ideal A/D conversion characteristics
when the digital output changes from the minimum voltage value B'00 0000 0000 (H'000) to
B'00 0000 0001 (H'001) (see figure 22.4).
•
Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristics
when the digital output changes from B'11 1111 1110 (H'3FE) to B'11 1111 1111 (H'3FF) (see
figure 22.4).
•
Nonlinearity error
The error with respect to the ideal A/D conversion characteristics between the zero voltage and
the full-scale voltage. Does not include the offset error, full-scale error, or quantization error
(see figure 22.4).
•
Absolute accuracy
The deviation between the digital value and the analog input value. Includes the offset error,
full-scale error, quantization error, and nonlinearity error.
Section 22 A/D Converter
Rev. 1.00 May 09, 2008 Page 705 of 954
REJ09B0462-0100
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