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参数资料
| 型号： | AD8115ASTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/33页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO CROSSPOINT SWIT 100LQFP |
| 标准包装： | 1 |
| 功能： | 视频交叉点开关 |
| 电路： | 1 x 16:16 |
| 电压电源： | 双电源 |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 5.5 V |
| 电流 - 电源： | 80mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 托盘 |
| 产品目录页面： | 801 (CN2011-ZH PDF) |
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AD8114/AD8115
Rev. B | Page 24 of 32
Effect of Impedances on Crosstalk
The input side crosstalk can be influenced by the output
impedance of the sources that drive the inputs. The lower the
impedance of the drive source, the lower the magnitude of the
crosstalk. The dominant crosstalk mechanism on the input side
is capacitive coupling. The high impedance inputs do not have
significant current flow to create magnetically induced
crosstalk. However, significant current can flow through the
input termination resistors and the loops that drive them. Thus,
the PC board on the input side can contribute to magnetically
coupled crosstalk.
From a circuit standpoint, the input crosstalk mechanism looks
like a capacitor coupling to a resistive load. For low frequencies,
the magnitude of the crosstalk will be given by
(
)
[
]s
C
R
XT
M
S
×
=
10
log
20
where
RS is the source resistance, CM is the mutual capacitance
between the test signal circuit and the selected circuit, and s is
the Laplace transform variable.
From the equation, it can be observed that this crosstalk
mechanism has a high-pass nature; it can be minimized by
reducing the coupling capacitance of the input circuits and
lowering the output impedance of the drivers. If the input is
driven from a 75 terminated cable, the input crosstalk can be
reduced by buffering this signal with a low output impedance
buffer.
On the output side, the crosstalk can be reduced by driving a
lighter load. Although the AD8114/AD8115 is specified with
excellent differential gain and phase when driving a standard
150 video load, the crosstalk will be higher than the
minimum obtainable due to the high output currents. These
currents will induce crosstalk via the mutual inductance of the
output pins and bond wires of the AD8114/AD8115.
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
)
/
(
log
20
10
L
R
s
Mxy
XT
×
=
where
Mxy is the mutual inductance of Output X to Output Y,
and
RL is the load resistance on the measured output. This
crosstalk mechanism can be minimized by keeping the mutual
inductance low and increasing RL. The mutual inductance can
be kept low by increasing the spacing of the conductors and
minimizing their parallel length.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8115ASTZ | 制造商:Analog Devices 功能描述:IC SWITCH VIDEO |
| AD8115ASTZ2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost 225 MHz 16 ?? 16 Crosspoint Switches |
| AD8115-EB | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost 225 MHz 16 X 16 Crosspoint Switches |
| AD8115-EVAL | 制造商:Analog Devices 功能描述:EVAL BD LOW COST 225 MHZ 16 16 CROSSPOINT SWITES - Bulk |
| AD8116 | 制造商:AD 制造商全称:Analog Devices 功能描述:200 MHz, 16 x 16 Buffered Video Crosspoint Switch |
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