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MB95110B Series
DS07-12615-3E
59
(3) Definition of A/D Converter Terms
Resolution
The level of analog variation that can be distinguished by the A/D converter.
When the number of bits is 10, analog voltage can be divided into 210
= 1024.
Linearity error (unit : LSB)
The deviation between the value along a straight line connecting the zero transition point
(“00 0000 0000”
← → “00 0000 0001”) of a device and the full-scale transition point
(“11 1111 1111”
← → “11 1111 1110”) compared with the actual conversion values obtained.
Differential linear error (Unit : LSB)
Deviation of input voltage, which is required for changing output code by 1 LSB, from an ideal value.
Total error (unit: LSB)
Difference between actual and theoretical values, caused by a zero transition error, full-scale transition error,
linearity error, quantum error, and noise.
(Continued)
VFST
1.5 LSB
3FFH
3FEH
3FDH
004H
003H
002H
001H
1 LSB
0.5 LSB
VOT
AVSS
AVCC
3FFH
3FEH
3FDH
004H
003H
002H
001H
AVSS
VNT
AVCC
{1 LSB
× (N 1) + 0.5 LSB}
1 LSB
= AVCC AVSS
1024
[LSB]
Total error of digital output N
=
VNT
{1 LSB × (N 1) + 0.5 LSB}
1 LSB
Ideal I/O characteristics
Total error
Digit
al
ou
tp
ut
Di
git
al
out
p
ut
Analog input
N
: A/D converter digital output value
VNT : A voltage at which digital output transits from (N
1) to N.
(V)
Actual conversion
characteristic
Actual conversion
characteristic
Ideal characteristics