MB95110A Datasheet, PDF (52/58 Pages) Fujitsu Component Limited. – 8-bit Proprietary Microcontrollers

MB95110A Series
(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.
3FFH
3FEH
3FDH
Ideal I/O characteristics
VFST
1.5 LSB
Total error
3FFH
3FEH
Actual conversion
characteristic
3FDH
{1 LSB × (N − 1) + 0.5 LSB}
004H
003H
VOT
002H
1 LSB
001H
0.5 LSB
AVSS
Analog input
AVCC
004H
003H
002H
001H
AVSS
VNT
Actual conversion
characteristic
Ideal characteristics
Analog input
AVCC
1 LSB = ^{AVCC − AVSS} (V)
1024
Total error of digital output N =
VNT − {1 LSB × (N − 1)
1 LSB
+ 0.5 LSB}
[LSB]
VNT : A voltage at which digital output transits from (N − 1) to N.
(Continued)
52