MB91F585ASH datasheet(162/176 Pages) CYPRESS

162 / 176 page

Document Number: 002-04665 Rev *A

Page 161 of 175

MB91580M/S Series

11.5.2

Definition of 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 ("0000 0000 0000"

←→"0000 0000 0001") to the full-scale transition point ("1111

1111 1110"

←→"1111 1111 1111").

Differential linearity error:

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

code by 1LSB.

Linearity error

Differential linearity error

Linearity error of digital output N =

VNT - {1LSB×(N-1) + VOT}

[LSB]

1LSB

Differential linearity error of digital output N =

V(N + 1)T - VNT

-1 LSB

[LSB]

1LSB

1LSB =

VFST - VOT

[V]

4094

VOT: Voltage at which the digital output changes from "000 H" to "001H".

VFST: Voltage at which the digital output changes from "FFE H" to "FFFH".

AVSS

(AVRL)

AVRH

Actual conversion

characteristics

{1 LSB (N - 1) + VOT}

AVSS

(AVRL)

VFST

VNT

VOT (Actually-measured value)

V(N+1)T

VNT

Ideal characteristics

Actual conversion

characteristics

Actual conversion

characteristics

Actual conversion

characteristics

Ideal characteristics

(Actually-measured value)

(Actually-

measured

value)

(Actually-measured value)

Analog input

(Actually-measured

value)

N - 1

N - 2

N + 1

FFF

FFE

FFD

004

003

002

001

11.5.3

Notes on Using A/D Converter

When the external impedance is too high, the sampling time for analog voltages may not be sufficient. In this case, it

is recommended to connect the capacitor (approx. 0.1

µF) to the analog input pin.

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