MB95F104AJS datasheet(63/72 Pages) FUJITSU

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MB95100AM Series

(3) Definition of A/D Converter Terms

• Resolution

The level of analog variation that can be distinguished by the A/D converter.

When the number of bits is 10, analog voltage can be divided into 210

= 1024.

• Linearity error (unit : LSB)

The deviation between the value along a straight line connecting the zero transition point (“00 0000 0000”

←

→ “00 0000 0001”) of a device and the full-scale transition point (“11 1111 1111” ← → “11 1111 1110”)

compared with the actual conversion values obtained.

• Differential linear error (Unit : LSB)

Deviation of input voltage, which is required for changing output code by 1 LSB, from an ideal value.

• Total error (unit: LSB)

Difference between actual and theoretical values, caused by a zero transition error, full-scale transition error,

linearity error, quantum error, and noise.

(Continued)

VFST

1.5 LSB

3FFH

3FEH

3FDH

004H

003H

002H

001H

3FFH

3FEH

3FDH

004H

003H

002H

001H

1 LSB

0.5 LSB

VOT

AVSS

AVR

AVSS

VNT

AVR

{1 LSB

× (N − 1) + 0.5 LSB}

1 LSB

AVR

− AVss

1024

(V)

Total error of

digital output N

VNT

− {1 LSB × (N − 1) + 0.5 LSB}

1 LSB

Ideal I/O characteristics

Total error

Analog input

[LSB]

Actual conversion

characteristic

Actual conversion

characteristic

Ideal characteristics

: A/D converter digital output value

VNT : A voltage at which digital output transits from (N

− 1) to N.

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