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16.5
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 16.4).
• 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 0000000000 to 0000000001
(see figure 16.5).
• Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic
when the digital output changes from 1111111110 to 1111111111 (see figure 16.5).
• Nonlinearity error
The error with respect to the ideal A/D conversion characteristics between zero voltage and
full-scale voltage. Does not include offset error, full-scale error, or quantization error.
• Absolute accuracy
The deviation between the digital value and the analog input value. Includes offset error, full-
scale error, quantization error, and nonlinearity error.
Rev. 1.00, 11/03, page 264 of 376
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Digital output
Ideal A/D conversion
characteristic
111
110
101
100
011
010
001
000
1
2
8
8
Figure 16.4 A/D Conversion Accuracy Definitions (1)
Quantization error
3
4
5
6
7
FS
8
8
8
8
8
Analog
input voltage
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