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參數(shù)資料
| 型號： | AD8108 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | ECONOLINE: REC2.2-S_DR/H1 - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- UL94V-0 Package Material- Continuous Short Circiut Protection- Internal SMD design- 100% Burned In- Efficiency to 75% |
| 中文描述： | 325兆赫，8 × 8的緩沖視頻交叉點(diǎn)開關(guān) |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 434K |
| 代理商： | AD8108 |
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AD8108/AD8109
–20–
REV. 0
All trademarks are property of their respective holders.
From a circuit standpoint, this output crosstalk mechanism
looks like a transformer, with a mutual inductance between the
windings, that drives a load resistor. For low frequencies, the
magnitude of the crosstalk is given by:
|
X T
| = 20 log
10
(
Mxy
×
s
/
R
L
)
where
Mxy
is the mutual inductance of output
x
to output
y
and
R
L
is the load resistance on the measured output. T his crosstalk
mechanism can be minimized by keeping the mutual inductance
low and increasing R
L
. T he mutual inductance can be kept low
by increasing the spacing of the conductors and minimizing
their parallel length.
PCB Layout
Extreme care must be exercised to minimize additional crosstalk
generated by the system circuit board(s). T he areas that must be
carefully detailed are grounding, shielding, signal routing and
supply bypassing.
T he packaging of the AD8108/AD8109 is designed to help keep
the crosstalk to a minimum. Each input is separated from each
other input by an analog ground pin. All of these AGNDs
should be directly connected to the ground plane of the circuit
board. T hese ground pins provide shielding, low impedance
return paths and physical separation for the inputs. All of these
help to reduce crosstalk.
Each output is separated from its two neighboring outputs by an
analog ground pin in addition to an analog supply pin of one
polarity or the other. Each of these analog supply pins provides
power to the output stages of only the two nearest outputs.
T hese supply pins and analog grounds provide shielding, physi-
cal separation and a low impedance supply for the outputs.
Individual bypassing of each of these supply pins, with a 0.01
μ
F
chip capacitor directly to the ground plane, minimizes high
frequency output crosstalk via the mechanism of sharing com-
mon impedances.
Each output also has an on-chip compensation capacitor that
is individually tied the nearby analog ground pins AGND00
through AGND07. T his technique reduces crosstalk by prevent-
ing the currents that flow in these paths from sharing a common
impedance on the IC and in the package pins. T hese AGNDxx
signals should all be directly connected to the ground plane.
T he input and output signals will have minimum crosstalk if
they are located between ground planes on layers above and
below, and separated by ground in between. Vias should be
located as close to the IC as possible to carry the inputs and
outputs to the inner layer. T he only place the input and output
signals surface is at the input termination resistors and the out-
put series back termination resistors. T hese signals should also
be separated, to the extent possible, as soon as they emerge from
the IC package.
E valuation Board
A four-layer evaluation board for the AD8108/AD8109 is avail-
able. T he exact same board and external components are used
for each device. T he only difference is the device itself, which
offers a selection of a gain of unity or gain of two through the
analog channels. T his board has been carefully laid out and
tested to demonstrate the specified high speed performance of
the device. Figure 46 shows the schematic of the evaluation
board. Figure 47 shows the component side silk-screen. T he
layouts of the board’s four layers are given in Figures 48, 49, 50
and 51.
T he evaluation board package includes the following:
Fully populated board with BNC-type connectors.
Windows based software for controlling the board from a
PC via the printer port.
Custom cable to connect evaluation board to PC.
Disk containing Gerber files of board layout.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8108-EB | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| AD8108AST | 325 MHz, 8 x 8 Buffered Video Crosspoint Switches |
| AD8109 | 325 MHz, 8 x 8 Buffered Video Crosspoint Switches |
| AD8109AST | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| AD8109* | 325 MHz. 8 3 8 Buffered Video Crosspoint Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8108_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:325 MHz, 8 ?? 8 Buffered Video Crosspoint Switches |
| AD8108AST | 制造商:Analog Devices 功能描述:Analog Video Crosspoint 325MHz 8 x 8 80-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:TQFP 250MHZ 8X8 G=+1 BUF VID XPOINT SW. - Tape and Reel 制造商:Analog Devices 功能描述:SWITCH CROSSPOINT 8X8 SMD 8108 |
| AD8108ASTZ | 功能描述:IC VIDEO CROSSPOINT SWIT 80LQFP 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:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導(dǎo)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(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
| AD8108ASTZ | 制造商:Analog Devices 功能描述:IC SWITCH VIDEO |
| AD8108ASTZ2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:325 MHz, 8 ?? 8 Buffered Video Crosspoint Switches |
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