參數(shù)資料
型號： MB90F922NCSPMC
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP120
封裝： 16 X 16 MM, 1.70 MM HEIGHT, 0.50 M PITCH, PLASTIC, LQFP-120
文件頁數(shù)： 59/72頁
文件大?。?/td> 2151K
代理商： MB90F922NCSPMC
MB90920 Series
62
DS07-13750-3E
Notes on the external impedance and sampling time of analog inputs
A/D converter with sample and hold circuit. If the external impedance is too high to keep sufficient sampling
time, the analog voltage charged 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 relationship
between the external impedance and minimum sampling time and either adjust the register value and operating
frequency or decrease the external impedance so that the sampling time is longer than the minimum value.
If the sampling time is still not sufficient, connect a capacitor of about 0.1
F to the analog input pin.
R
Comparator
C
Analog input
Analog input equivalent circuit
During sampling : ON
Note : The values are reference values.
MB90F922NC/F922NCS/ F923NC/F923NCS/F924NC/F924NCS
MB90922NCS
R
C
4.5 V
≤ AVcc ≤ 5.5 V : 2.6 k (Max) 8.5 pF (Max)
4.0 V
≤ AVcc ≤ 4.5 V : 12.1 k (Max) 8.5 pF (Max)
MB90V920-101/102
4.5 V
≤ AVcc ≤ 5.5 V : 2.0 k (Max) 14.4 pF (Max)
4.0 V
≤ AVcc ≤ 4.5 V : 8.2 k (Max) 14.4 pF (Max)
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