791
A/D Converter (ADC)
Chapter 20
Preliminary User’s Manual U17566EE1V2UM00
(3)
Quantization error
This is an error of ±1/2 LSB that inevitably occurs when an analog value is
converted into a digital value. Because the A/D Converter converts analog
input voltages in a range of ±1/2 LSB into the same digital codes, a
quantization error is unavoidable.
This error is not included in the overall error, zero-scale error, full-scale error,
integral linearity error, or differential linearity error in the characteristics table.
Figure 20-11
Quantization error
(4)
Zero-scale error
This is the difference between the actually measured analog input voltage and
its theoretical value when the digital output changes from 0…000 to 0…001
(1/2 LSB).
Figure 20-12
Zero-scale error
Q
ua
ntiz
a
tion error
1......1
0......0
0
AV
REF
An
a
log inp
u
t
Digit
a
l o
u
tp
u
t
1/2 L
S
B
1/2 L
S
B
AV
REF
An
a
log inp
u
t (L
S
B)
Digit
a
l o
u
tp
u
t (lo
w
er
3
b
it
s
)
Ide
a
l line
111
−
1
0
1
2
3
100
011
010
001
000
Zero-
s
c
a
le error
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