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參數(shù)資料
| 型號： | AD8184 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 700MHz 1-of-4 Multiplexer(700MHz四選一多路復用器) |
| 中文描述： | 700MHz的1 - 4復用器（700MHz的四選一多路復用器） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 200K |
| 代理商： | AD8184 |
AD8184
–8–
REV. 0
Chip capacitors should be used for supply bypassing. One end
of the capacitor should be connected to the ground plane and
the other within 1/4 inch of each power pin. An additional large
(4.7
μ
F–10
μ
F) tantalum capacitor should be connected in par-
allel with each of the smaller capacitors for low impedance sup-
ply bypassing over a broad range of frequencies.
Signal traces should be as short as possible. Stripline or
microstrip techniques should be used for long (longer than
about 1 inch) signal traces. T hese should be designed with a
characteristic impedance of 50
or 75
and be properly ter-
minated at each end using surface mount components.
Careful layout is imperative to minimize crosstalk. Guards
(ground or supply traces) must be run between all signal traces
to limit direct capacitive coupling. Input and output signal lines
should fan out away from the mux as much as possible. If mul-
tiple signal layers are available, a buried stripline structure hav-
ing ground plane above, below and between signal traces will
have the best crosstalk performance.
Return currents flowing through termination resistors can also
increase crosstalk if these currents flow in sections of the finite-
impedance ground circuit shared between more than one input
or output. Minimizing the inductance and resistance of the ground
plane can reduce this effect, but further care should be taken in po-
sitioning the terminations. T erminating cables directly at the con-
nectors will minimize the return current flowing on the board, but
the signal trace between the connector and the mux will look like
an open stub and will degrade the frequency response. Moving the
termination resistors close to the input pins will improve the fre-
quency response, but the terminations from neighboring inputs
should not have a common ground return.
APPLIC AT IONS
A Buffered 4-to-1 Multiplexer
In applications where the output of a multiplexer must drive a
back-terminated 75
line (R
L
= 75
+ 75
), it is necessary
to buffer the output of the AD8184. In the example in Figure
22, this is accomplished using the AD8009 high speed current
feedback op amp. T he amplifier is configured with a gain of 2 to
compensate for the signal halving due to termination at the multi-
plexer input. T his gives the overall circuit a gain of unity.
If lower speed can be tolerated, a number of other amplifiers
can replace the AD8009 op amp in the above circuit. In general
there is a trade-off between bandwidth and power consumption.
T able II summarizes the bandwidth and power consumption
characteristics of these op amps.
T able II. Amplifier Options for Multiplexer Buffering
Op Amp Comments
AD8009
Highest Bandwidth, (G = +2) = 700 MHz, I
SY
=
14 mA
AD8001
Lower Power Consumption, Bandwidth (G = +2) =
440 MHz, I
SY
= 5 mA
AD8011
Lower Power Consumption, Bandwidth (G = +2) =
210 MHz, I
SY
= 1 mA
AD8079
Fixed Gain Dual Amplifier (2 or 2.2), Bandwidth =
260 MHz, I
SY
= 5 mA Per Amp
AD8005
Lowest Power Consumption, Bandwidth (G = +2) =
170 MHz, I
SY
= 400
μ
A
–V
S
681
+1
DECODER
1
2
3
4
5
6
7
14
13
12
11
10
9
8
+1
+1
+1
AD8184
75
75
75
75
+V
S
NC
–V
S
GND
GND
GND
0.1μF
10μF
V
OUT
0.1μF
10μF
10μF
0.1μF
+V
S
+V
S
10μF
0.1μF
A0
A1
75
–V
S
681
AD8009
IN0
IN1
IN2
IN3
Figure 22. A Buffered 4-to-1 Multiplexer
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD8184AN | 制造商:Analog Devices 功能描述:Analog Multiplexer Single 4:1 14-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:PDIP WIDEBAND 4:1 BUFFERED MULTIPLEXER - Bulk |
| AD8184ANZ | 功能描述:IC VIDEO MULTIPLEXER 4X1 14DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 特色產(chǎn)品:MicroPak? 標準包裝:1 系列:- 功能:開關 電路:2 x SPST - NC 導通狀態(tài)電阻:500 毫歐 電壓電源:單電源 電壓 - 電源，單路/雙路(±):1.4 V ~ 4.3 V 電流 - 電源:150nA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-XFDFN 供應商設備封裝:8-XSON，SOT833-1 （1.95x1） 包裝:Digi-Reel® 其它名稱:568-5557-6 |
| AD8184AR | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 其它有關文件:STG4159 View All Specifications 標準包裝:5,000 系列:- 功能:開關 電路:1 x SPDT 導通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應商設備封裝:7-覆晶 包裝:帶卷 (TR) |
| AD8184AR-REEL | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 標準包裝:1,000 系列:- 功能:多路復用器 電路:1 x 4:1 導通狀態(tài)電阻:- 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±5V 電流 - 電源:7mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| AD8184AR-REEL7 | 功能描述:IC VIDEO MULTIPLEXER 4X1 14SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 標準包裝:1,000 系列:- 功能:多路復用器 電路:1 x 4:1 導通狀態(tài)電阻:- 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±5V 電流 - 電源:7mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
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