MB90350E 查看數據表（PDF） - Fujitsu

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MB90350E

16-bit Microcontrollers

Fujitsu 

MB90350E Series

6. Definition of A/D Converter Terms

Resolution

: Analog variation that is recognized by an A/D converter.

Non linearity

error

: Deviation between a line across zero-transition line ( “00 0000 0000” ← → “00 0000 0001” )

and full-scale transition line ( “11 1111 1110” ← → “11 1111 1111” ) and actual conversion

characteristics.

Differential

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

linearity error

value.

Total error

: Difference between an actual value and a theoretical value. A total error includes zero

transition error, full-scale transition error, and linear error.

3FFH

3FEH

3FDH

Total error

Actual conversion

characteristics

1.5 LSB

{1 LSB × (N − 1) + 0.5 LSB}

004H

003H

002H

001H

AVSS

VNT

(Actual measurement value)

Actual conversion

characteristics

Ideal characteristics

0.5 LSB

Analog input

AVRH

Total error of digital output “N” =

1 LSB (Ideal value) =

VNT − {1 LSB × (N − 1) + 0.5 LSB}

1 LSB

AVRH − AVSS [V]

1024

[LSB]

N : A/D converter digital output value

VOT (Ideal value) = AVSS + 0.5 LSB [V]

VFST (Ideal value) = AVRH − 1.5 LSB [V]

VNT : A voltage at which digital output transits from (N − 1) H to NH.

(Continued)

DS07-13744-4E

81

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