LINR2 datasheet(89/108 Pages) FUJITSU

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MB96320 Series

FME-MB96320 rev 7

Definition of A/D Converter Terms

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

Total error: Difference between the actual value and the ideal value. The total error includes zero transition error,

full-scale transition error and nonlinearity error.

Nonlinearity 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 nonlinearity error: Deviation of input voltage, which is required for changing output code by 1 LSB,

from an ideal value.

Zero reading voltage: Input voltage which results in the minimum conversion value.

Full scale reading voltage: Input voltage which results in the maximum conversion value.

3FF

3FE

3FD

004

003

002

001

AVRL

AVRH

VNT

1.5 LSB

0.5 LSB

{1 LSB

× (N − 1) + 0.5 LSB}

Actual conversion

characteristics

(Actually-measured value)

Actual conversion

characteristics

Ideal characteristics

Analog input

Total error of digital output “N”

VNT

− {1 LSB × (N − 1) + 0.5 LSB}

1 LSB

[LSB]

1 LSB

= (Ideal value)

AVRH

− AVRL

1024

[V]

VOT (Ideal value)

= AVRL + 0.5 LSB [V]

VFST (Ideal value)

= AVRH − 1.5 LSB [V]

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

− 1) to N.

Total error

N: A/D converter digital output value

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