參數(shù)資料
型號: MB91F647APMC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PQFP176
封裝: 24 X 24 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-176
文件頁數(shù): 31/136頁
文件大?。?/td> 4055K
代理商: MB91F647APMC
MB91645A Series
126
DS07-16911-1E
The output impedance of the external circuit connected to the analog input affects the sampling time of the A/D
converter. Design the output impedance of the output circuit such that the required sampling time is less than the
value of TS calculated from the following equation.
(Equation1) Ts
= (Rin + Rext) × Cin × 8
Ts
: Sampling time
Rin
: Input resistance of A/D
= 5.3 kΩ
Cin
: Input capacitance of A/D
= 8.5 pF
Rext : Output impedance of external circuit
If the sampling time is set as 600 ns,
600 ns
≥ (5.3 kΩ + Rext) × 8.5 pF × 8
∴Rext ≤ 3.5 kΩ
And the impedance of the external circuit therefore needs to be 3.5 k
Ω or less.
Rin
Cin
Rext
Comparator
Rin
Cin
Approx. 5.3 k
Ω Approx. 8.5 pF
Analog signal
source
AN0 to AN31
Analog input pin
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