參數(shù)資料
型號： M38C13M6-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 25/61頁
文件大?。?/td> 665K
代理商： M38C13M6-XXXFP
Rev.2.40
Jun 14, 2004
page 29 of 56
38C1 Group
Definition of A/D converter accuracy
The A/D conversion accuracy is defined below (refer to Figure 28).
Relative accuracy
Zero transition voltage (V0T)
This means an analog input voltage when the actual A/D conver-
sion output data changes from “0” to “1.”
Full-scale transition voltage (VFST)
This means an analog input voltage when the actual A/D conver-
sion output data changes from “255” to ”254.”
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
VREF (VCC in 38C1 Group) of actual A/D conversion characteristics.
VREF
(VCC)
V254
Vn
V1
V0
Vn+1
n+1
n
254
255
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–V254
Fig. 28 Definition of A/D conversion accuracy
VFST–V0T
254
VREF*
256
Vn: Analog input voltage when the output data changes from “n” to
“n+1” (n = 0 to 254)
1LSB at relative accuracy
→
(V)
1LSB at absolute accuracy
→
(V)
* VREF = VCC in the 38C1 Group.
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