MB90F482BPMC datasheet(112/124 Pages) FUJITSU

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MB90480B/485B Series

112

DS07-13722-11E

• A/D Converter Glossary

(Continued)

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.

3FFH

3FEH

3FDH

004H

003H

002H

001H

AVRL

AVRH

VNT

0.5 LSB

{1 LSB

× (N − 1) + 0.5 LSB}

Actual conversion

value

(Measured value)

Actual conversion

value

Theoretical

characteristics

Analog input

Total error

Total error for digital output N

VNT

− {1 LSB × (N − 1) + 0.5 LSB}

1 LSB

[LSB]

1 LSB (Theoretical value)

AVR

− AVss

1024

[V]

: A/D converter digital output value

VOT (Theoretical value)

= AVss + 0.5 LSB [V]

VFST (Theoretical value)

= AVR − 1.5 LSB [V]

VNT : Voltage at a transition of digital output from (N-1) H, NH

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