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參數(shù)資料
| 型號： | TCF6000D |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | PERIPHERAL CLAMPING ARRAY |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | PLASTIC, SOP-8 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 93K |
| 代理商： | TCF6000D |
TCF6000
4
MOTOROLA ANALOG IC DEVICE DATA
The use of Cin is not mandatory, and is not recommended
where the lines to be protected are used for output or for both
input and output. For digital input lines, the use of a small
capacitor in the range of 50 pF to 220 pF is recommended as
this will reduce the rate of rise of voltage seen by the
TCF6000 and hence the possibility of overshoot.
In the case of the analog inputs, such as that from the
pressure sensor, the capacitor Cin is necessary for devices
such as the MC6805S2 shown, which present a low
impedance during the sampling period. The maximum value
for Cin is determined by the accuracy required, the time taken
to sample the input and the input impedance during that time,
while the maximum value is determined by the required
frequency response and the value of Rin.
Thus for a resistive input A/D connector where:
Ts
RD
Vin
k
Q1
Q2
ID
= Device input current (A)
= Sample time (seconds)
= Device input resistance (
)
= Input voltage (V)
= Required accuracy (%)
= Charge on capacitor before sampling
= Charge on capacitor after sampling
Q1–Q2 =
k
Q1
100
Thus:
but,
and,
Q1
Q1–Q2
= Cin Vin
= ID
Ts
so that, ID Ts =k
Cin–Vin
100
and, Cin (min) =ID
Ts
Vin
k
Farad
so, Cin (min) =1k
Ts
RD
Farad
The calculation for a sample and hold type converter is
even simpler:
k
CH
= Hold capacitor (Farad)
100
CH
k
For the MC6805S2 this comes out at:
= Required accuracy (%)
Cin (min) =
Farad
Cin (min) =10.25
= 10 nF for 1/4% accuracy
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