參數(shù)資料
型號(hào)： MB89P665R
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(yè)數(shù)： 34/47頁(yè)
文件大?。?/td> 688K
代理商： MB89P665R
34
MB89660R Series
7. A/D Converter
Input impedance of analog input pins
The A/D converter used for the MB89660R 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 2 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
(1 LSB
×
N + V
OT
)
0000
0000
0000
0001
1111
1111
1110
1111
1 LSB =
AVR
256
Linearity error =
V
NT
– (1 LSB
×
N + V
OT
)
1 LSB
Differential linearity error =
V
( N + 1 ) T
– V
NT
1 LSB
Analog input
Actual conversion value
Theoretical conversion value
– 1
Total error =
1 LSB
V
NT
– (1 LSB
×
N + 1 LSB)
Linearity error
Closes for 8 instruction cycles
after starting A/D conversion.
Sample hold circuit
C
33 pF
Analog channel selector
Analog input pin
R
6 k
Comparator
If the output impedance of
the external circuit is high, it
is recommended to connect
an external capacitor of
approx. 0.1
μ
F.
.
Analog Input Equivalent Circuit
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