參數(shù)資料
型號(hào): MB90W224AZF
元件分類: 微控制器/微處理器
英文描述: 16-BIT, UVPROM, 16 MHz, MICROCONTROLLER, CQFP120
封裝: CERAMIC, QFP-120
文件頁數(shù): 82/105頁
文件大?。?/td> 1700K
代理商: MB90W224AZF
MB90220 Series
78
6. A/D Converter Glossary
Resolution:
Analog changes that are identifiable with the A/D converter
When the number of bits is 10, analog voltage can be divided into 210 = 1024.
Total error:
Difference between actual and logical values. This error is caused by a zero transition
error, full-scale transition error, linearity error, differential linearity error, or by noise.
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 1111” “11 1111
1110”) 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
Note: The values shown here are reference values.
Analog input
Comparator
C1
C0
RON2
RON1
RON1: Approx. 1.5 k
RON2: Approx. 1.5 k
C0: Approx. 60 pF
C1: Approx. 4 pF
Analog Input Circuit Mode
VFST
VNT
V0T
1 LSB
VFST – V0T
1022
=
Linearity error
VNT– (N
× 1 LSB + V0T)
=
1 LSB
Differential linearity error
VNT – V(N–1)T
=
1 LSB
Total error
Digital output
11 1111 1111
11 1111 1110
11 1111 1101
00 0000 0010
00 0000 0001
00 0000 0000
– 1
V(N + 1)T
N = 0 to 1022
VNT (N = 0) = V0T
VNT (N = 1022) = VFST
N = 1 to 1022
N + 1
N
N – 1
Linearity error
N
× 1LSB + V0T
V(N – 1)T
V1T
V2T
Theoretical value (VNT)
Theoretical value
Actual conversion value
AVRL
AVRH (V)
,
1 LSB theoretical value
AVRH – AVRL
1022
=
Total error
VNT – {(N + 0.5)
× 1 LSB theoretical value}
=
1 LSB theoretical value
N = 0 to 1022
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