MB91155 datasheet(98/105 Pages) FUJITSU

98 / 105 page

MB91F155A/MB91155/MB91154

• A/D Converter Glossary

(Continued)

• Resolution

: Analog changes that are identifiable by 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 one LSB

from the theoretical value.

• Total error

: The difference between actual and theoretical conversion values including a

zero transition/full-scale transition/linearity error.

3FF

3FE

3FD

004

003

002

001

AVSS

AVRH

Analog input

0.5 LSB'

{1 LSB' ( N − 1 ) + 0.5 LSB'}

1.5 LSB'

Theoretical characteristics

Actual conversion

characteristics

VNT

(Actual measurement)

Actual conversion

characteristics

Total error

Total error of digital output N

VNT

− {1 LSB’ × (N − 1) + 0.5 LSB’}

1 LSB’

1 LSB’ (theoretical value)

AVRH

− AVSS

1024

[V]

VOT’ (theoretical value)

VNT : Voltage at which digital output changes from (N

+ 1) to N.

AVSS

+ 0.5 LSB’

[V]

VFST’ (theoretical value)

= AVRH − 1.5 LSB’ [V]

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