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CHAPTER 13 A/D CONVERTER
User’s Manual U12697EJ3V0UM
(4) Zero-scale error
This expresses the difference between the actual and theoretical analog input voltage measurement values when
the digital output changes from 0.....000 to 0.....001 (1/2LSB). If the actual value is higher than the theoretical
value, the zero-scale error indicates the difference between the actual and theoretical analog input voltage
measurement values when the digital output changes from 0.....001 to 0.....010 (3/2LSB).
(5) Full-scale error
This expresses the difference between the actual and theoretical analog input voltage measurement values when
the digital output changes from 1.....110 to 1.....111 (full-scale – 3/2LSB).
(6) Integral linearity error
This expresses the extent to which the conversion characteristics differ from the theoretical linear relationship.
The integral linearity error indicates the maximum error between the actual and theoretical measurement values
when the zero-scale and full-scale errors are both 0.
(7) Differential linearity error
This expresses the difference between the actual and theoretical measurement values of the width output by a
certain code when the width output by a theoretical code is 1LSB.
Figure 13-10. Zero-Scale Error
Figure 13-11. Full-Scale Error
111
011
010
001
000
0
1
2
3
AV
DD
Ideal linearity
Digital output (lower 3 bits)
Zero-scale error
Analog input (LSB)
000
101
110
111
0
AV
DD
-1
AV
DD
AV
DD
-2
AV
DD
-3
Full-scale error
Digital output (lower 3 bits)
Ideal linearity
Analog input (LSB)
