Renesas RL78 Series User Manual page 383

RL78/G1D
(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 12-40. Zero-Scale Error
111
Ideal line
011
010
001
000
0
1
1024 AV
REF
Figure 12-42. Integral Linearity Error
1 ...... 1
Ideal line
0 ...... 0
0
(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.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Zero-scale error
2 3
AV
1024 AV 1024 AV
REF0
REF REF
Analog input (V)
Integral linearity
error
AV
REF
Analog input
Sampling
time
Figure 12-41. Full-Scale Error
111
110
101
000
0
1021
1024
Figure 12-43. Differential Linearity Error
1 ...... 1
Ideal 1LSB width
0 ...... 0
0
Conversion time
CHAPTER 12 A/D CONVERTER
Full-scale error
Ideal line
1022 1023
AV
AV AV AV
REF
REF REF REF
1024 1024
Analog input (V)
Differential
linearity error
AV
REF
Analog input
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