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參數(shù)資料
| 型號(hào)： | MB89P135A |
| 廠(chǎng)商： | Fujitsu Limited |
| 英文描述： | 8-Bit Proprietary Microcontroller(8位專(zhuān)用微控制器) |
| 中文描述： | 8位微控制器專(zhuān)利（8位專(zhuān)用微控制器） |
| 文件頁(yè)數(shù)： | 42/56頁(yè) |
| 文件大?。?/td> | 689K |
| 代理商： | MB89P135A |
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42
MB89130/130A Series
7. Notes on Using A/D Converter
lnput impedance of the analog input pins
The A/D converter used for the MB89130/130A 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 conver-
sion.
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.
Linearity error
(1 LSB
×
N + V
OT
)
Digital output
V
OT
V
NT
V
(N+1)T
V
FST
Theoretical conversion value
1111 1111
1111 1110
E
E
E
E
E
E
E
E
E
E
E
0000 0010
0000 0001
0000 0000
1 LSB
=
AVR
256
V
NT
– (1 LSB
×
N + V
OT
)
1 LSB
– 1
V
(N+1)T
– V
NT
1 LSB
Total error =
Differential linearity error =
Linearity error =
V
NT
– (1 LSB
×
N + 1 LSB)
1 LSB
Analog input
Actual conversion value
Sample hold circuit
C .
Comparator
Analog input pin
R =
9
k
.
Close for 8 instruction cycles after starting
A/D conversion.
Analog channel selector
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 Equivalent Circuit
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