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參數(shù)資料
| 型號： | PS399ESEX |
| 廠商： | PERICOM SEMICONDUCTOR CORP |
| 元件分類： | 多路復用及模擬開關 |
| 英文描述： | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO16 |
| 封裝： | 0.150 INCH, SOIC-16 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 207K |
| 代理商： | PS399ESEX |
10
PS8185F
09/28/04
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PS398/PS399
Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
The table below shows how many time constants (m
τ) are
needed to reach an accuracy of one LSB.
τ = RON x CCOM(ON)
Bits
Accuracy (%)
m
8
0.25
6
12
0.012
9
15
0.0017
11
Now, let’s calculate what the maximum sampling rate for the
PS398. Assume a 12-bit accuracy and room temperature
operation.
Figure 10. Equivalent model of one multiplexer channel
VIN
RS
VS
CCOM(ON)
RON
CL
In equation (1) above, n = 8, tTRANS = 150ns, tSETTLING = 9
τ,
τ=100ohmx54pF
_______________________ ,
8 [150ns + 9(100ohm x 54pF)]
or fS = 630kHz.
Assuming a x4 oversampling rate, the maximum sampling speed
for the PS398 would be 630
÷4 = 157kHz.
f
S =
1
相關PDF資料 |
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|---|---|
| PS399ESEE | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO16 |
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| PS398CSEX | 8-CHANNEL, SGL ENDED MULTIPLEXER, PDSO16 |
| PS399CSE | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO16 |
| PS398ESEX | 8-CHANNEL, SGL ENDED MULTIPLEXER, PDSO16 |
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