參數(shù)資料
型號(hào): M37281MAH-XXXSP
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
中文描述: 單芯片8位CMOS微機(jī)隱蔽字幕解碼器和屏幕顯示控制器
文件頁(yè)數(shù): 53/172頁(yè)
文件大小: 1319K
代理商: M37281MAH-XXXSP
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Rev.1.01 2003.07.16 page 53 of 170
M37281MAH
XXXSP,M37281MFH
XXXSP,M37281MKH
XXXSP, M37281EKSP
8.8.8 Definition of A-D Conversion Accuracy
The definition of A-D conversion accuracy is described below (refer
to Figure 8.8.4).
Accuracy is shown the difference between measurement result out-
put code and output code which is expected for A-D conversion whose
specification is ideal by using LSB.
The analog input voltage in accuracy measurement is made to be a
middle point of input voltage width (=1 LSB) which outputs the code
in which the A-D converter with the ideal characteristics is identical.
For example, 1 LSB
s width is 20 mV at V
REF
= 5.12V.
0 mV, 20 mV, 40 mV and 60 mV are selected for analog input voltage.
A-D conversion accuracy is shown in Fig 8.8.4.
That the output code expected in the ideal A-D converter is
05
16
shows that there is actual A-D conversion result with in
03
16
to
07
16
on the = ±2LSB absolute accuracy, when the analog input voltage is
100 mV.
And, zero error and scale error are contained for the absolute accu-
racy, and the quantization error is not contained.
Fig. 8.8.4 Definition of A-D Conversion Accuracy
Output code
0
Analog input voltage (mV)
20
40
80
100
120
140
160
180
200
220
00
16
01
16
02
16
03
16
04
16
05
16
06
16
07
16
08
16
09
16
+ 2LSB
2LSB
60
Absolute accuracy
Limitless resolution A-D
conversion characteristics
Ideal A-D conversion
characteristics
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