MB90540/540G/545/545G Series
• A/D Converter Glossary
Resolution : Analog changes that are identifiable with the A/D converter
Linearity error : The deviation of the straight line connecting the zero transition point (“00 0000 0000” ←→ “00
0000 0001”) with the full-scale transition point (“11 1111 1110” ←→ “11 1111 1111”) from actual
conversion characteristics
Differential linearity error : The deviation of input voltage needed to change the output code by 1 LSB from the
theoretical value
Total error : The total error is defined as a difference between the actual value and the theoretical value, which
includes zero-transition error/full-scale transition error and linearity error.
Total error
3FF
0.5 LSB
Actual conversion
Value
3FE
3FD
{1 LSB × (N − 1) + 0.5 LSB}
004
003
002
001
VNT
(measured value)
Actual conversion
characteristics
Theoretical
characteristics
0.5 LSB
AVRL
AVRH
Analog input
AVRH − AVRL
1 LSB = (Theoretical value)
[V]
1024
VOT (Theoretical value) = AVRL + 0.5 LSB [V]
VFST (Theoretical value) = AVRH − 1.5 LSB [V]
VNT − {1 LSB × (N − 1) + 0.5 LSB}
Total error for digital output N =
[LSB]
1 LSB
VNT : Voltage at a transition of digital output from (N − 1) to N
(Continued)
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