參數(shù)資料
型號(hào)： MB89P677APMC1
廠(chǎng)商： FUJITSU LTD
元件分類(lèi)： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP80
封裝： 14 X 14 MM, 1.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, LQFP-80
文件頁(yè)數(shù)： 39/56頁(yè)
文件大?。?/td> 1656K
代理商： MB89P677APMC1
MB89670AR Series
44
DS07-12537-2E
Since the A/D converter contains a sample & hold circuit, the level of the analog input pin might not stabilize within
the sampling period after starting A/D, resulting in inaccurate A/D conversion values, if the input impedance to the
analog pin is too high. Be sure to maintain an appropriate input impedance to the analog pin.
It is recommended to keep the input impedance to the analog pin from exceeding 10 k
. If it exceeds 10 k, it is
recommended to connect a capacitor of approx. 0.1
F to the analog input pin.
Except for the sampling period after starting A/D, the input leakage current of the analog input pin is less than 10
A.
7. A/D Converter Glossary
Resolution
Analog-change that are identifiable with the A/D converter.
Linearity error
The deviation of the straight line connecting the zero transition point (“00 0000 0000”
“00 0000 0001”) with
the full-scale transition point (“11 1111 1111”
“11 1111 1110”) from actual conversion characteristics
Differential linearity error
The deviation of the input voltage needed to change the output code by 1 LSB from the theoretical voltage
Total error
The difference between theoretical and actual conversion values, caused by the zero transition error, full-scale
transition error, linearity error, quantization error, and noise.
(Continued)
3FF
3FE
3FD
004
003
002
001
VOT
0.5 LSB
AVSS
1 LSB
1.5 LSB
VFST
AVR
3FF
3FE
3FD
004
003
002
001
AVSS
VNT
AVR
{1 LSB
× N + 0.5 LSB}
1 LSB =
VFST – VOT
1022
(V)
VNT – {1 LSB
× N + 0.5 LSB }
1 LSB
Theoreticall I/O characteristics
Digital
output
Analog input
Digital
output
Total error
Actual conversion
value
Actual conversion
value
Theoretical value
Analog input
Total error of digital output N =
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