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參數(shù)資料
| 型號： | PS399 |
| 英文描述： | Analog | 4-Channel Differential Mux |
| 中文描述： | 模擬| 4通道差分復(fù)用器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 256K |
| 代理商： | PS399 |
9
PS8185E 10/29/03
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PS398/PS399
Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers
Figure 8. NO/COM Capacitance
Figure 9. Overvoltage protection is accomplished using two
external blocking diodes or two current limiting resistors.
V+
Positive Supply
COM
NO
Vg
V-
Applications
Overvoltage Protection
Proper power-supply sequencing is recommended for all CMOS
devices. Do not exceed the absolute maximum ratings, because
stresses beyond the listed ratings may cause permanent damage to
the devices. Always sequence V+ on first, followed by V-, and then
logic inputs. If power-supply sequencing is not possible, add two
small signal diodes or two current limiting resistors in series with
the supply pins for overvoltage protection (Figure 9). Adding
diodes reduces the analog signal range, but low switch resistance
and low leakage characteristics are unaffected.
Maximum Sampling Rate
From the sampling theorem, the sampling frequency needed to
properly recover the original signal should be more than twice
its maximum component frequency. In real applications,
sampling at three or four times the maximum signal frequency is
customary.
The maximum sampling rate of a multiplexer is determined by its
transition time (t
TRANS
), the number of channels being multiplexed,
and the settling time (t
SETTLING
) of the sampled signal at the out-
put. The maximum sampling rate is:
______ 1
f
TRANS
+ t
SETTLING
)
Where n = number of channels scanned: 8 for PS398,
4 for PS399. t
TRANS
is given on the specification table: 150 ns max.
Settling time is the time needed for the output to stabilize within
the desired accuracy band of +1 LSB (least significant bit).
Other factors determining settling time are: signal source imped-
ance, capacitive load at the output. Figure 10 illustrates the steady
state model. To figure out what the settling time due to the multi-
plexer is, we can assume that R
S
= 0
, and C
L
= 0. In real life, the
effects of R
S
and C
L
should be taken into account when perform-
ing these calculations.
S =
V+
+5V
-5V
COM
GND
V-
N01
N08
A0
A1
A2
EN
f
PS398
=1MHz
Channel
Select
1MHz
Capacitance
Analyzer
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PS399CPE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Channel Analog Multiplexer |
| PS399CSE | 功能描述:IC MULTIPLEXER DUAL 4X1 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:- 電路:2 x SPST 導(dǎo)通狀態(tài)電阻:20 歐姆 電壓電源:單電源 電壓 - 電源，單路/雙路(±):3 V ~ 5.5 V 電流 - 電源:4.1mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:帶卷 (TR) |
| PS399CSEE | 功能描述:多路器開關(guān) IC Precision Diff 4Ch 17V Analog RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| PS399CSEEX | 功能描述:多路器開關(guān) IC Precision Diff 4Ch 17V Analog RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| PS399CSEX | 制造商:Pericom Semiconductor Corporation 功能描述:Analog Multiplexer Single 4:1 16-Pin SOIC T/R |
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