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RL78/G1A CHAPTER 11 A/D CONVERTER
R01UH0305EJ0200 Rev.2.00 395
Jul 04, 2013
(5) Full-scale error
This shows the difference between the actual measurement value of the analog input voltage and the theoretical
value (Full-scale − 3/2LSB) when the digital output changes from 1......110 to 1......111.
(6) Integral linearity error
This shows the degree to which the conversion characteristics deviate from the ideal linear relationship. It expresses
the maximum value of the difference between the actual measurement value and the ideal straight line when the zero-
scale error and full-scale error are 0.
(7) Differential linearity error
While the ideal width of code output is 1LSB, this indicates the difference between the actual measurement value and
the ideal value.
Figure 11-40. Zero-Scale Error Figure 11-41. Full-Scale Error
111
011
010
001
Zero-scale error
Ideal line
000
012 3 AV
REF
Digital output (Lower 3 bits)
Analog input (LSB)
111
110
101
000
0
AV
REF
−3
Full-scale error
Ideal line
Analog input (LSB)
Digital output (Lower 3 bits)
AV
REF
−2AV
REF
−1
AV
REF
Figure 11-42. Integral Linearity Error Figure 11-43. Differential Linearity Error
0
AV
REF
Digital output
Analog input
Integral linearity
error
Ideal line
1
......
1
0
......
0
0
AV
REF
Digital output
Analog input
Differential
linearity error
1
......
1
0
......
0
Ideal 1LSB width
(8) Conversion time
This expresses the time from the start of sampling to when the digital output is obtained.
The sampling time is included in the conversion time in the characteristics table.
(9) Sampling time
This is the time the analog switch is turned on for the analog voltage to be sampled by the sample & hold circuit.
Sampling
time
Conversion time