參數(shù)資料
型號(hào)： MB89T627R
廠商： Fujitsu Limited
元件分類： 8位微控制器
英文描述： 8-bit Proprietary Microcontroller
中文描述： 8位微控制器專有
文件頁數(shù)： 44/61頁
文件大?。?/td> 915K
代理商： MB89T627R
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
)
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.
R .
Sample hold circuit
C .
Analog Input Equivalent Circiut
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