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參數(shù)資料
| 型號： | MB89191PF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Quadruple 2-Input Positive-AND Gates 20-LCCC -55 to 125 |
| 中文描述： | 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | 8.60 X 17.75 MM, 2.80 MM HEIGHT, 1.27 MM PITCH, PLASTIC, SOP-28 |
| 文件頁數(shù)： | 33/47頁 |
| 文件大?。?/td> | 634K |
| 代理商： | MB89191PF |
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33
MB89190/190A Series
7. Notes on Using A/D Converter
Input impedance of analog input pins
The A/D converter used for the MB89190A series contains a sample hold circuit as illustrated below to fetch
analog input voltage into the sample hold capacitor for eight instruction cycles after starting 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 approx.
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
NT
V
( N + I )T
V
FST
Digital output
(1LSB
×
N + V
OT
)
0000
0000
0000
0001
1111
1111
1110
1111
1LSB =
AVR
256
Linearity error
V
NT
– (1LSB
×
N + V
OT
)
1LSB
Differential linearity error
V
( N + 1 ) T
– V
NT
1LSB
V
NT
– (1LSB
×
N + 1LSB)
Analog input
Actual conversion value
Theoretical conversion value
–1
Total error
1LSB
Linearity error
=
=
=
Sample .
C .
Analog channel selector
Close for 8 instruction cycles
after starting A/D conversion.
Analog input equivalent circuit
If the analog input impedance
is higher than 10 k
, it is
recommended to connect an
external capacitor of approx.
0.1
μ
F.
Analog input pin
Comparator
R ..
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