參數(shù)資料
型號： M38K27M4L-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 31/151頁
文件大?。?/td> 1403K
代理商： M38K27M4L-XXXFP
38K2 Group
Rev.3.00
Oct 15, 2006
page 126 of 147
REJ03B0193-0300
Definition of A/D Conversion Accuracy
The A/D conversion accuracy is defined below (refer to Figure
167).
Relative accuracy
Zero transition voltage (VOT)
This means an analog input voltage when the actual A/D con-
version output data changes from “0” to “1.”
Full-scale transition voltage (VFST)
This means an analog input voltage when the actual A/D con-
version output data changes from “1023” to “1022.”
Non-linearity error
This means a deviation from the line between VOT and VFST of
a converted value between VOT and VFST.
Differential non-linearity error
This means a deviation from the input potential difference re-
quired to change a converted value between VOT and VFST by 1
LSB of the 1 LSB at the relative accuracy.
Absolute accuracy
This means a deviation from the ideal characteristics between 0 to
VREF of actual A/D conversion characteristics.
VREF
1024
Vn: Analog input voltage when the output data changes from “n” to “n + 1” (n = 0 to 1022)
1 LSB at relative accuracy
→
(V)
1 LSB at absolute accuracy
→
(V)
VFST – VOT
1022
Analog voltage
VREF
V1022
Vn
V1
V0
Zero transition voltage (V0T)
Full-scale transition voltage (VFST)
Non-linearity error=
Actual A/D conversion
characteristics
Vn+1
n+1
n
1022
1023
1
0
Ideal line of A/D
conversion between
V0 to V1022
Output data
b
a
a: 1LSB at relative accuracy
b: Vn+1-Vn
c: Difference between
the ideal Vn and actual Vn
Differential non-linearity error=
b-a
a [LSB]
c
a [LSB]
Fig. 167 Definition of A/D conversion accuracy
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