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參數(shù)資料
| 型號： | MB89P627R |
| 廠商： | Fujitsu Limited |
| 英文描述： | 8-Bit Proprietary Microcontroller(8位專用微控制器) |
| 中文描述： | 8位微控制器專利（8位專用微控制器） |
| 文件頁數(shù)： | 44/62頁 |
| 文件大?。?/td> | 1058K |
| 代理商： | MB89P627R |
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44
MB89620R Series
7. Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter contains a sample hold circuit as illustrated below to fetch analog input voltage into the
sample hold capacitor for eight instruction cycles after activating A/D conversion.
For this reason, if the output impedance of the external circuit for the analog input is high, analog input voltage
might not stabilize within the analog input sampling period. Therefore, it is recommended to keep the output
impedance of the external circuit low (below 10 k
).
Note that if the impedance cannot be kept low, it is recommended to connect an external capacitor of about
0.1
μ
F for the analog input pin.
Error
The smaller the | AVR – AV
SS
|, the greater the error would become relatively.
V
OT
V
OT
V
NT
V
NT
V
(N + I)T
V
V
FST
V
Digital output
(1 LSB
×
N + V
OT
)
×
OT
)
0000
0000
0001
0010
1111
1111
1111
1111
1 LSB =
AVR
256
Linearity error =
V
NT
– (1 LSB
×
N + V
OT
)
1 LSB
Analog input
Differential linearity error =
V
( N + 1 ) T
– V
NT
1 LSB
– 1
Total error =
1 LSB
V
NT
– (1 LSB
×
N + 1 LSB)
V
NT
×
Linearity error
Theoretical conversion value
Actual conversion value
V
NT
×
OT
)
V
NT
Analog channel selector
Analog input pin
Comparator
Close for 8 instruction cycles after activating
A/D conversion.
If the analog input
impedance is higher
than 10 k
, it is
recommended to
connect an external
capacitor of approx.
0.1
μ
F.
μ
F.
R .
Sample hold circuit
C .
Analog Input Equivalent Circiut
.
.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MB89P627-SH | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P629 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P629PF | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P629P-SH | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P637 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
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