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参数资料
| 型号： | MB89193AP-SH |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PDIP28 |
| 封装： | 10.16 MM, 1.778 MM PITCH, PLASTIC, DIP-28 |
| 文件页数： | 26/44页 |
| 文件大小： | 1235K |
| 代理商： | MB89193AP-SH |
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MB89190/190A Series
32
DS07-12512-9E
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
F for the analog input pin.
Error
The smaller the
AVR-AVSS, the greater the error would become relatively.
VNT
V( N + I )T
VFST
Digital output
0000
0001
0010
1111
1110
1111
1LSB =
(AVR - AVSS)
256
Linearity error
VNT (1LSB
× N + VOT)
1LSB
Differential linearity error
V( N + 1 ) T VNT
1LSB
Analog input
1
Total error
1LSB
VNT (1LSB
× N + 1LSB)
=
Theoretical conversion value
Actual conversion value
(1LSB
× N + VOT)
Linearity error
VOT
Sample & hold circuit
C = 33 pF
Analog channel selector
Close for 8 instruction cycles
after starting A/D conversion.
Analog input equivalent circuit
Analog input pin
Comparator
.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MB89193P | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89193PF | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89193P-SH | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89195 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89195A | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
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