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參數(shù)資料
| 型號： | MB89F217PFM |
| 廠商： | FUJITSU LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 12.5 MHz, MICROCONTROLLER, PQFP48 |
| 封裝： | PLASTIC, QFP-48 |
| 文件頁數(shù)： | 36/50頁 |
| 文件大小： | 875K |
| 代理商： | MB89F217PFM |
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MB89210 Series
41
(3) Precautionary Information of A/D conversion
Input Impedance of Analog Input Pins
The A/D converter has a sample & hold circuit as shown below, which uses a sample-and-hold capacitor to
obtain the voltage at the analog input pin for 16 instruction cycles following the start of A/D conversion. For this
reason if the external circuits providing the analog input signal have high output impedance, the analog input
voltage may not stabilize within the analog input sampling time. It is therefore recommended that the output
impedance of external circuits be reduced to 4 k
or less.
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.
About errors
The smaller the absolute value |VCC
VSS| is, the greater the relative error becomes.
Analog input equivalent circuit
RC
If analog input impedance is 4 k
or
more, the use of a capacitor of ap-
proximately 0.1
F is recommend-
ed.
Analog input pin
Sample-and-hold
circuit
Comparator
Closes 16 instruction cycles
after the start of A/D conversion
Analog channel selector
MB89215
R
= approx. 2.2 k, C = approx. 45 pF
MB89F217, MB89P215 R
= approx. 2.6 k, C = approx. 28 pF
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