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參數(shù)資料
| 型號(hào)： | MB90F912BSPMC |
| 廠商： | FUJITSU LTD |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-48 |
| 文件頁(yè)數(shù)： | 51/64頁(yè) |
| 文件大?。?/td> | 1749K |
| 代理商： | MB90F912BSPMC |
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MB90910 Series
DS07–13755–2E
55
About the external impedance of analog input and its sampling time
A/D converter with sample and hold circuit. If the external impedance is too high to keep sufficient sampling
time, the analog voltage changed to the internal sample and hold capacitor is insufficient, adversely affecting
A/D conversion precision. Therefore, to satisfy the A/D conversion precision standard, consider the relation-
ship between the external impedance and minimum sampling time and either adjust the resistor value and
operating frequency or decrease the external impedance so that the sampling time is longer than the minimum
value. And, if the sampling time cannot be sufficient, connect a capacitor of about 0.1
μF to the analog input
pin.
C
R
Analog input equivalent circuit model
Analog input
Note : The values are reference values.
4.5 V
≤ AVCC ≤ 5.5 V : R := 2.52 kΩ, C := 10.7 pF
4.0 V
≤ AVCC < 4.5 V : R := 13.6 kΩ, C := 10.7 pF
4.5 V
≤ AVCC ≤ 5.5 V : R := 4.1 kΩ, C := 8.5 pF
4.0 V
≤ AVCC < 4.5 V : R := 10.33 kΩ, C := 8.5 pF
MB90V950AMAS
MB90F912BS
MB90911AS
Comparator
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