MB90F883ASPF datasheet(69/75 Pages) FUJITSU

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MB90880 Series

Definition of A/D Converter Terms

(Continued)

Resolution

: Analog variation that is recognized by an A/D converter.

Non linearity

error

: Deviation between a line across zero-transition line ( “00 0000 0000”

← → “00 0000 0001” )

and full-scale transition line ( “11 1111 1110”

← → “11 1111 1111” ) and actual conversion

characteristics.

Differential

linearity error

: Deviation of input voltage, which is required for changing output code by 1 LSB, from an ideal

value.

Total error

: Difference between an actual value and a theoretical value. A total error includes zero tran-

sition error, full-scale transition error, and linear error.

3FFH

3FEH

3FDH

004H

003H

002H

001H

AVSS

AVRH

VNT

1.5 LSB

0.5 LSB

{1 LSB

× (N − 1) + 0.5 LSB}

Actual conversion

characteristics

(Actual measurement value)

Ideal characteristics

Actual conversion

characteristics

Total error

Total error of digital output “N”

VNT

− {1 LSB × (N − 1) + 0.5 LSB}

1 LSB

[LSB]

1 LSB (Ideal value)

AVRH

− AVSS

1024

[V]

VOT (Ideal value)

= AVSS + 0.5 LSB [V]

VFST (Ideal value)

= AVRH − 1.5 LSB [V]

VNT : A voltage at which digital output transits from (N

− 1) H, NH.

Analog input

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