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Chapter 11
A/D Converter
User’s Manual U16702EE3V2UD00
(3)
Quantization error
This is an error of 1/2 LSB that inevitably occurs when an analog value is converted into a digital
value.
Because the A/D converter converts analog input voltages in a range of 1/2 LSB into the same
digital codes, a quantization error is unavoidable.
This error is not included in the overall error, zero-scale error, full-scale error, integral linearity
error, or differential linearity error in the characteristics table.
Figure 11-20:
Quantization Error
(4)
Zero-scale error
This is the difference between the actually measured analog input voltage and its theoretical value
when the digital output changes from 0…000 to 0…001 (1/2 LSB).
Figure 11-21:
Zero-Scale Error
Quantization error
1......1
0......0
AV
REF0
Analog input
Digital output
1/2 LSB
1/2 LSB
0
Analog input (LSB)
Digital output (lower 3 bits)
Ideal line
111
1
0
1
2
3
100
011
010
001
000
Zero-scale error
AV
REF0
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