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R01UH0336EJ0102 Rev.1.02
Page 1353 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 23 A/D Converter
(4)
Zero-Scale Error
The zero-scale error is the difference between a measured value and a
theoretical value (1/2 LSB) of the analog input voltage when the digital output
changes from 0…000 to 0…001.
Figure 23-25
Zero-Scale Error
111
000
Ideal line
Analog input
AV
REFP
AV
REFM
Zero-scale error
AV
REFM
+ x
001
100
010
011
AV
REFM
+ 2x
AV
REFM
+ 3x
AV
REFM
- x
Note x: Voltage corresponding to 1 LSB
x = (AV
REFP
−AV
REFM
) x 1 LSB
Digital output (lower 3 bits)