參數(shù)資料
型號: MB91605PMC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, MROM, 80 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): 61/68頁
文件大?。?/td> 1435K
代理商: MB91605PMC
MB91605 Series
64
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.
Ts
= (Rin + Rext) × Cin × 8
Ts
: Sampling time
Rin : Input resistance of A/D
= 5 k
Cin : Input capacitance of A/D
= 27 pF
Rext : Output impedance of external circuit
If the sampling time is taken to be 5.9
s:
5.9
s = (5 k + Rext) × 27 pF × 8
∴ Rext = 22.3 k
And the impedance of the external circuit therefore needs to be 22 k
or less.
Rin
Cin
Cin = 27 pF
Rin = 5 k
AN0 to AN11
Analog input pin
Comparator
20
10
15
20
25
30
3540
30
40
50
60
70
80
90
100
110
120
20
10
30507090
110
30
40
50
60
70
80
90
100
110
120
Peripheral clock frequency and external impedance
Peripheral clock cycle and external impedance
Peripheral clock cycle [ns]
External
impedance
[k
]
Peripheral clock frequency [MHz]
External
impedance
[k
]
The relationship between peripheral clock and external impedance
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