Zero-Scale Error; Full-Scale Error; Integral Linearity Error; Differential Linearity Error - NEC 78K0 User Manual

(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 13-14. Zero-Scale Error
111
Ideal line
011
010
001
000
0 1
Analog input (LSB)
Figure 13-16. 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.
CHAPTER 13 A/D CONVERTER

Zero-scale error

2 3 AV
REF *
Integral linearity
error
AV
REF
Analog input
Sampling
time
Conversion time
User's Manual U15947EJ2V0UD
Figure 13-15. Full-Scale Error
Full-scale error
111
110
101
000
−3 −2
0
AV AV
REF REF
Analog input (LSB)
Figure 13-17. Differential Linearity Error
1 ...... 1
Ideal 1LSB width
Differential
linearity error
0 ...... 0
0
Analog input
Ideal line
−1
AV AV
REF REF
AV
REF
293