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6. A/D Conversion Accuracy Definitions
A/D conversion accuracy in the H8/3008 is defined as follows:
•
Resolution
Digital output code length of A/D converter
•
Offset error
Deviation from ideal A/D conversion characteristic of analog input voltage required to
raise digital output from minimum voltage value 0000000000 to 0000000001 (figure
14.10)
•
Full-scale error
Deviation from ideal A/D conversion characteristic of analog input voltage required to
raise digital output from 1111111110 to 1111111111 (figure 14.10)
•
Quantization error
Intrinsic error of the A/D converter; 1/2 LSB (figure 14.9)
•
Nonlinearity error
Deviation from ideal A/D conversion characteristic in range from zero volts to full scale,
exclusive of offset error, full-scale error, and quantization error.
•
Absolute accuracy
Deviation of digital value from analog input value, including offset error, full-scale error,
quantization error, and nonlinearity error.
414
Digital
output
Ideal A/D conversion
111
110
101
100
011
010
001
000
1/8 2/8 3/8 4/8 5/8 6/8 7/8 FS
Figure 14.9 A/D Converter Accuracy Definitions (1)
characteristic
Quantization error
Analog input
voltage
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