參數(shù)資料
型號(hào)： MB89875PFV
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 8-bit Proprietary Microcontroller
中文描述： 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP80
封裝： PLASTIC, LQFP-80
文件頁數(shù)： 37/51頁
文件大?。?/td> 734K
代理商： MB89875PFV
37
MB89870 Series
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
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 + 1)T
V
FST
Digital output
(1 LSB
×
N + V
OT
)
00 0000
00 0000
0000
0001
11 1111
11 1111
1110
1111
1 LSB =
AVR
1024
Linearity error =
Differential linearity error =
Analog input
Actual conversion value
Theoretical conversion value
Total error =
V
NT
– (1 LSB
×
N + V
OT
)
1 LSB
V
( N + 1 ) T
– V
NT
1 LSB
V
NT
– (1 LSB
×
N + 1 LSB)
– 1
1 LSB
Linearity error
Sample hold circuit
C .
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
μ
F.
Analog input pin
Comparator
R .
Analog Input Equivalent Circuit
相關(guān)PDF資料
PDF描述
MB89890 8-bit Proprietary Microcontrollers
MB89898PF 8-bit Proprietary Microcontroller
MB89899PF 8-bit Proprietary Microcontroller
MB89P899PF 8-bit Proprietary Microcontroller
MB89PV890CF 8-bit Proprietary Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB89890 制造商:未知廠家 制造商全稱:未知廠家 功能描述:一個(gè)帶定時(shí)功能和驅(qū)動(dòng)的IC，DIP16
MB89898 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
MB89898PF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
MB89899 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
MB89899PF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller
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