Datasheet

V850ES/JG3 CHAPTER 13 A/D CONVERTER
R01UH0015EJ0300 Rev.3.00 Page 440 of 870
Sep 30, 2010
(5) Full-scale error
This is the difference between the actually measured analog input voltage and its theoretical value when the digital
output changes from 1…110 to 1…111 (full scale − 3/2 LSB).
Figure 13-19. Full-Scale Error
AVREF0
Analog input (LSB)
Digital output (lower 3 bits)
111
AV REF0 − 3 0 AV REF0 − 2AV REF0 − 1
100
011
010
000
Full-scale error
(6) Differential linearity error
Ideally, the width to output a specific code is 1 LSB. This error indicates the difference between the actually
measured value and its theoretical value when a specific code is output. This indicates the basic characteristics of
the A/D conversion when the voltage applied to the analog input pins of the same channel is consistently increased
bit by bit from AV
SS to AVREF0. When the input voltage is increased or decreased, or when two or more channels
are used, see 13.7 (2) Overall error.
Figure 13-20. Differential Linearity Error
Ideal width of 1 LSB
Differential
linearity error
1
......
1
0
......
0
AV
REF0
Analog input
Digital output