MB91F577CSPMC datasheet(152/163 Pages) CYPRESS

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Document Number: 002-04725 Rev.*A

Page 152 of 163

MB91570 Series

13.5.2

Definition of A/D Converter Terms

Resolution

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

Linearity error

: Deviation of the actual conversion characteristics from a straight line that connects the zero

transition point ("00 0000 0000"←→"00 0000 0001") to the full-scale transition point

("11 1111 1110"← →"11 1111 1111").

Differential linearity error

: Deviation of the input voltage from the ideal value that is required to change the output code by

1LSB.

Total error

: Difference between the actual value and the theoretical value. The total error includes zero

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

Total error

Total error of digital output N =

VNT - {1LSB × (N - 1) + 0.5LSB}

[LSB]

1LSB

1LSB (Ideal value) =

AVRH - AVSS

[V]

1024

VOT (Ideal value) = AVSS + 0.5 LSB[V]

VFST (Ideal value) = AVRH - 1.5 LSB[V]

VNT: Voltage at which the digital output changes from (N - 1) to N.

3FF

3FE

3FD

004

003

002

001

AVSS

(AVRL)

AVRH

0.5 LSB

{1 LSB × (N - 1) + 0.5 LSB}

1.5 LSB

Ideal characteristics

Actual

conversion

characteristics

(Actually-measured value)

Analog input

Actual

conversion

characteristics

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