参数资料
型号: MB91F639ABGL
厂商: FUJITSU LTD
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA144
封装: 12 X 12 MM, 1.45 MM HEIGT, 0.80 MM PITCH, PLASTIC, PFBGA-144
文件页数: 28/136页
文件大小: 4123K
代理商: MB91F639ABGL
MB91635A Series
DS07-16909-2E
123
(Continued)
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 AN30
Analog input pin
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