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參數(shù)資料
| 型號： | MB89P558A-201PFT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 12.5 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 0.40 MM PITCH, PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 37/51頁 |
| 文件大?。?/td> | 651K |
| 代理商： | MB89P558A-201PFT |
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MB89550A Series
42
(11) Notes for A/D Conversion
Analog input pins and input impedance
The A/D converter in the MB89550A series incorporates a sample & hold circuit as shown below. When an A/
D conversion starts, the voltage at the analog input pin is captured by the sample & hold capacitor for a period
of 16 instruction cycles.
Accordingly, if the output impedance of the external circuit connected to the analog input is high, the analog
input voltage may not stabilize within the period of the analog input sampling time. Therefore, it is recommended
that the output impedance of the external circuit be sufficiently low (10 k
or less) .
Error
The relative error increases as
AVR AVSS becomes smaller.
Equivalent circuit for MB89558A and MB89557A analog input
C
= 30 pF
R
= 3.2 k
Analog input pin
Sample & hold circuit
Compara-
tor
Closed for approximately 16 instruction
cycles after start of A/D conversion
Analog channel selector
Equivalent circuit for MB89P558A and MB89PV550A analog input
C
= 64 pF
R
= 1.4 k
Analog input pin
Sample & hold circuit
Compara-
tor
Closed for approximately 16 instruction
cycles after start of A/D conversion
Analog channel selector
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MB89P558A-202PFV | 8-BIT, OTPROM, 12.5 MHz, MICROCONTROLLER, PQFP100 |
| MB89P558A-202PFT | 8-BIT, OTPROM, 12.5 MHz, MICROCONTROLLER, PQFP100 |
| MB89558APFT-XXX | 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PQFP100 |
| MB89P558A-203PFV | 8-BIT, OTPROM, 12.5 MHz, MICROCONTROLLER, PQFP100 |
| MB89P585BPFV | 8-BIT, OTPROM, 12.5 MHz, MICROCONTROLLER, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB89P558A-201PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P558A-202PFT | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P558A-202PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P558A-203PFT | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
| MB89P558A-203PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:8-bit Proprietary Microcontroller |
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