MB89637PFM View Datasheet(PDF) - Fujitsu

Part Name

Description

Manufacturer

MB89637PFM

(MB89660R Series) 8-bit Proprietary Microcontroller

Fujitsu 

MB89630 Series

6. A/D Converter Glossary

• Resolution

Analog changes that are identifiable with the A/D converter.

• Linearity error

The deviation of the straight line connecting the zero transition point (“00 0000 0000” ↔ “00 0000 0001”) with

the full-scale transition point (“11 1111 1110” ↔ “11 1111 1111”) from actual conversion characteristics

• Differential linearity error

The deviation of input voltage needed to change the output code by 1 LSB from the theoretical value

• Total error (unit: LSB)

The difference between theoretical and actual conversion values caused by the zero transition error, full-scale

transition error, linearity error, quantization error, and noise

Theoretical I/O characteristics

3FF

3FE

VFST

3FD

1.5 LSB

004

003

VOT

002

1 LSB

001

AVSS

0.5 LSB

Analog input

AVR

1 LSB =

VFST – VOT

(V)

1022

Total error

3FF

3FE

Actual conversion

value

3FD

{1 LSB × N + 0.5 LSB}

004

003

002

001

AVSS

VNT

Actual conversion

value

Theoretical value

Analog input

AVR

Digital output N total error = VNT – {1 LSB × N + 0.5 LSB}

1 LSB

(Continued)

41

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