MB91F464HB datasheet(85/105 Pages) CYPRESS

85 / 105 page

Document Number: 002-04621 Rev. *A

Page 85 of 105

MB91460H Series

Definition of A/D converter terms

• Resolution

Analog variation that is recognizable by the A/D converter.

• Nonlinearity error

Deviation between actual conversion characteristics and a straight line connecting the zero transition point

(00 0000 0000B  00 0000 0001B) and the full scale transition point (11 1111 1110B  11 1111 1111B).

• Differential nonlinearity error

Deviation of the input voltage from the ideal value that is required to change the output code by 1 LSB.

• Total error

This error indicates the difference between actual and theoretical values, including the zero transition error, full

scale transition error, and nonlinearity error.

(Continued)

3FFH

3FEH

3FDH

004H

003H

002H

001H

AVSS5

AVRH

0.5 LSB'

{1 LSB’ (N

- 1) + 0.5 LSB’}

1.5 LSB’

Analog input

Total error

Actual conversion

characteristics

VNT

(measurement

value)

Ideal characteristics

Actual conversion

characteristics

Total error of digital output N =

1 LSB'

VNT - {1 LSB' × (N - 1) + 0.5 LSB'}

N : A/D converter digital output value

VOT' (ideal value) = AVSS5 + 0.5 LSB' [V]

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

VNT : Voltage at which the digital output changes from (N + 1) H to NH

1LSB' (ideal value) =

1024

AVRH - AVSS5

[V]

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