参数资料
型号: M37274MA-XXXSP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PDIP52
封装: 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-52
文件页数: 58/131页
文件大小: 2049K
代理商: M37274MA-XXXSP
32
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP
PRELIMINARY
Notice:
This
is not
a final
specification.
Some
paramentic
limits
are
subject
to change.
MITSUBISHI MICROCOMPUTERS
[ LSB ]
(8) Definition of A-D Conversion Accuracy
The definition of A-D conversion accuracy is described below.
Relative accuracy
Zero transition error (V0T)
The deviation of the input voltage at which A-D conversion output
data changes from “0” to “1,” from the corresponding ideal A-D
conversion characteristics between 0 and VREF.
Non-linearity error
The deviation of the actual A-D conversion characteristics, from the
ideal A-D conversion characteristics between V0 and V254.
(V0 – 1/2 ! VREF/256)
1LSB
V0T =
(VREF – 3/2 ! VREF/256) – V254
1LSB
VFST=
Non-linearity error =
[ LSB ]
Differential non-linearity error
The deviation of the input voltage required to change output data
by “1,” from the corresponding ideal A-D conversion characteris-
tics between 0 and VREF.
Absolute accuracy
Absolute accuracy error
The deviation of the actual A-D conversion characteristics, from the
ideal A-D conversion characteristics between 0 and VREF.
Vn – (1LSB ! n+ V0)
1LSB
[ LSB]
Differential non-linearity error =
(Vn+1 –Vn) – 1LSB
1LSB
Absolute accuracy error =
1LSBA with respect to absolute accuracy =
1LSB with respect to relative accuracy =
Note: The analog input voltage “Vn” at which A-D conversion output
data changes from “n” to “n + 1” (n ; 0 to 254) is as follows
(refer to Figure 24) :
V254 –V0
254
VREF
256
[V ]
Fig. 24. Definition of A-D Conversion Accuracy
Full-scale transition error (VFST)
The deviation of the input voltage at which A-D conversion output
data changes from “255” to “254,” from the corresponding ideal A-
D conversion characteristics between 0 and VREF.
Vn – 1LSBA ! (n + 1/2)
1LSBA
Output
data
0
Analog input
voltage (V)
V0
Vn Vn+1
V254
VREF
n
n+1
254
255
Zero transition error (V 0T)
Differential non-
linearity error
LSBA
Actual A-D
conversion
characteristics
1
2
3
2
V1
1LSB A
Ideal A-D conversion characteristics
between V0 and V254
LSBA
1LSB
Absolute accuracy
Non-linearity error
Full-scale transition error
(VFST)
1LSB
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