MB91F587LD datasheet(163/177 Pages) SPANSION

163 / 177 page

D at aS h ee t

160

MB91F587LA_DS705-00012-2v0-E, August 22, 2014

CONFIDENTIAL

(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

(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.

•

Analog input circuit model

12bit A/D

1.9kΩ (max)

8.30pF (max) (4.5V Avcc 5.5V)

Note: Listed values must be considered as reference values.

Sampling ON

Comparator

Analog input

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