MB90347CE datasheet(69/85 Pages) FUJITSU

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MB90340E Series

Definition of A/D Converter Terms

(Continued)

Resolution

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

Non linearity

error

: The deviation between the actual conversion characteristics and a line that joins the

zero-transition line ( “00 0000 0000”

← → “00 0000 0001” ) to the full-scale transition line

( “11 1111 1110”

← → “11 1111 1111” ) .

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 the actual value and the ideal value. The total error includes zero

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

3FFH

3FEH

3FDH

004H

003H

002H

001H

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

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 the digital output transitions from (N

− 1) to N.

N : Value of the digital output from the A/D converter

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