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Section 14 A/D Converter
14.6
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 14.6).
• 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 14.7).
• 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 14.7).
• 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
(see figure 14.7).
• 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.
Rev.2.00 Jun. 28, 2007 Page 538 of 666
REJ09B0311-0200
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