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参数资料
| 型号： | MB89PV870CF |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 10 MHz, MICROCONTROLLER, CQFP80 |
| 封装： | CERAMIC, MQFP-80 |
| 文件页数： | 31/45页 |
| 文件大小： | 509K |
| 代理商： | MB89PV870CF |
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MB89870 Series
37
7.
Notes on Using A/D Converter
Input impedance of the analog input pins
The A/D converter used for the MB89870 series 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
F for the analog input pin.
Error
The smaller the | AVR – AVSS |, the greater the error would become relatively.
VOT
VNT
V(N + 1)T
VFST
Digital output
(1 LSB
× N + VOT)
00 0000
0000
0001
0010
11 1111
1110
1111
1 LSB =
AVR
1024
Linearity error =
Differential linearity error =
Analog input
Actual conversion value
Theoretical conversion value
Total error =
VNT – (1 LSB
× N + VOT)
1 LSB
V( N + 1 ) T – VNT
1 LSB
– 1
1 LSB
VNT – (1 LSB
× N + 1 LSB)
Linearity error
Sample hold circuit
Analog channel selector
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
F.
Analog input pin
Comparator
R = 6 k
.
C = 33 pF
.
Analog Input Equivalent Circuit
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相关代理商/技术参数 |
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|---|---|
| MB89PV890 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontrollers |
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