参数资料
型号: M34501M2-XXXFP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, MROM, MICROCONTROLLER, PDSO20
封装: 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件页数: 51/118页
文件大小: 952K
代理商: M34501M2-XXXFP
Rev.3.01
2005.02.07
page 36 of 112
REJ03B0104-0301
4501 Group
(15) Definition of A/D converter accuracy
The A/D conversion accuracy is defined below (refer to Figure 32).
Relative accuracy
Zero transition voltage (V0T)
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.”
Linearity error
This means a deviation from the line between V0T and VFST of
a converted value between V0T and VFST.
Differential non-linearity error
This means a deviation from the input potential difference re-
quired to change a converter value between V0T and VFST by 1
LSB at the relative accuracy.
Absolute accuracy
This means a deviation from the ideal characteristics between 0
to VDD of actual A/D conversion characteristics.
Fig. 32 Definition of A/D conversion accuracy
VFST–V0T
1022
VDD
1024
Vn: Analog input voltage when the output data changes from “n” to
“n+1” (n = 0 to 1022)
1LSB at relative accuracy
(V)
1LSB at absolute accuracy
(V)
VDD
V1022
Vn
V1
V0
Vn+1
n+1
n
1022
1023
1
0
b
a
c
Output data
Differential non-linearity error =
Linearity error =
[LSB]
c
a
b–a
a
[LSB]
Actual A/D conversion
characteristics
a: 1LSB by relative accuracy
b: Vn+1–Vn
c: Difference between ideal Vn
and actual Vn
Zero transition voltage (V0T)
Analog voltage
Full-scale transition voltage (VFST)
Ideal line of A/D conversion
between V0–V1022
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