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| 型號： | ADV3200ASWZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 27/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CROSSPOINT SWIT 32X32 176LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 交叉點開關(guān) |
| 電路： | 1 x 32:32 |
| 電壓電源： | 單/雙電源 |
| 電壓 - 電源，單路/雙路(±)： | 5V，±2.5V，±3.3V |
| 電流 - 電源： | 250mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 176-LQFP |
| 供應(yīng)商設(shè)備封裝： | 176-LQFP-EP（24x24） |
| 包裝： | 托盤 |
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ADV3200/ADV3201
Rev. 0 | Page 33 of 3
6
Measuring Crosstalk
Crosstalk is measured by applying a signal to one or more
channels and measuring the relative strength of that signal on a
desired selected channel. The measurement is usually expressed
as decibels below the magnitude of the test signal. The crosstalk
is expressed by
=
)
(
)
(
log
20
10
s
A
s
A
XT
TEST
SEL
(4)
where:
s = jω (Laplace transform variable).
ASEL(s) is the amplitude of the crosstalk induced signal in the
selected channel.
ATEST(s) is the amplitude of the test signal.
It can be seen that crosstalk is a function of frequency but not a
function of the magnitude of the test signal (to first order). In
addition, the crosstalk signal has a phase relative to the test
signal associated with it.
A network analyzer is most commonly used to measure cross-
talk over a frequency range of interest. It can provide both
magnitude and phase information about the crosstalk signal.
As a crosspoint system or device grows larger, the number of
theoretical crosstalk combinations and permutations can become
extremely large. For example, in the case of the 32 × 32 matrix
of the ADV3200/ADV3201, note the number of crosstalk terms
that can be considered for a single channel, for example, the IN00
input. IN00 is programmed to connect to one of the ADV3200/
ADV3201 outputs where the measurement can be made.
First, the crosstalk terms associated with driving a test signal
into each of the other 31 inputs can be measured one at a time,
while applying no signal to IN00. Then the crosstalk terms
associated with driving a parallel test signal into all 31 other
inputs can be measured two at a time in all possible combina-
tions, then three at a time, and so on until, finally, there is only
one way to drive a test signal into all 31 other inputs in parallel.
Each of these cases is legitimately different from the others and
may yield a unique value, depending on the resolution of the
measurement system, but it is hardly practical to measure all
these terms and then specify them. In addition, this describes
the crosstalk matrix for just one input channel. A similar cross-
talk matrix can be proposed for every other input. In addition,
if the possible combinations and permutations for connecting
inputs to the other outputs (not used for measurement) are
taken into consideration, the numbers quickly grow to astro-
nomical proportions. If a larger crosspoint array of multiple
ADV3200/ADV3201 devices is constructed, the numbers grow
larger still.
Obviously, some subset of all these cases must be selected as a
guide for a practical measurement of crosstalk. One common
method is to measure all hostile crosstalk; this means that the
crosstalk to the selected channel is measured while all other
system channels are driven in parallel. In general, this yields the
worst crosstalk number, but this is not always the case due to
the vector nature of the crosstalk signal.
Other useful crosstalk measurements are those created by one
nearest neighbor or by the two nearest neighbors on either side.
These crosstalk measurements are generally higher than those
of more distant channels; therefore, they can serve as a worst-
case measure for any other one-channel or two-channel crosstalk
measurements.
Input and Output Crosstalk
Capacitive coupling is voltage-driven (dV/dt) but is generally a
constant ratio. Capacitive crosstalk is proportional to input or
output voltage, but this ratio is not reduced by simply reducing
signal swings. Attenuation factors must be changed by changing
impedances (lowering mutual capacitance), or destructive
canceling must be utilized by summing equal and out of phase
components. For high input impedance devices such as the
ADV3200/ADV3201, capacitances generally dominate input-
generated crosstalk.
Inductive coupling is proportional to current (dI/dt) and often
scales as a constant ratio with signal voltage, but it also shows a
dependence on impedances (load current). Inductive coupling
can also be reduced by constructive canceling of equal and out
of phase fields. In the case of driving low impedance video
loads, output inductances contribute highly to output crosstalk.
The flexible programming capability of the ADV3200/ADV3201
can be used to diagnose whether crosstalk is occurring more on
the input side or the output side. Some examples are illustrative.
A given input pair (IN07 in the middle for this example) can be
programmed to drive OUT07 (also in the middle). The inputs
to IN07 are terminated to ground (via 50 Ω or 75 Ω resistors)
and no signal is applied.
All the other inputs are driven in parallel with the same test signal
(practically provided by a distribution amplifier), with all other
outputs except OUT07 disabled. Because the grounded IN07
input is programmed to drive OUT07, no signal should be
present. Any signal that is present can be attributed to the other
15 hostile input signals because no other outputs are driven
(they are all disabled). Thus, this method measures all the
hostile input contribution to crosstalk into IN07. Of course, this
method can be used for other input channels and combinations
of hostile inputs.
For output crosstalk measurement, a single input channel is
driven (IN00, for example) and all outputs other than a given
output (IN07 in the middle) are programmed to connect to
IN00. OUT07 is programmed to connect to IN15 (far away
from IN00), which is terminated to ground. Thus OUT07
should not have a signal present because it is listening to a quiet
input. Any signal measured at OUT07 can be attributed to the
output crosstalk of the other 15 hostile outputs. Again, this
method can be modified to measure other channels and other
crosspoint matrix combinations.
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADV3200-EVALZ | 功能描述:ADV3200 - Interface, Crosspoint Switch/Multiplexer Evaluation Board 制造商:analog devices inc. 系列:- 零件狀態(tài):有效 主要用途:接口，交叉點開關(guān)/多路復(fù)用器 嵌入式:- 使用的 IC/零件:ADV3200 主要屬性:32 x 32 視頻交叉點開關(guān) 輔助屬性:圖形用戶界面 所含物品:板，線纜 標(biāo)準(zhǔn)包裝:1 |
| ADV3201 | 制造商:AD 制造商全稱:Analog Devices 功能描述:300 MHz, 32 × 32 Buffered Analog Crosspoint Switch |
| ADV3201ASWZ | 功能描述:IC CROSSPOINT SWIT 32X32 176LQFP 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:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 功能:開關(guān) 電路:單刀單擲 導(dǎo)通狀態(tài)電阻:48 歐姆 電壓電源:單電源 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電流 - 電源:5µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:托盤 |
| ADV3201-EVALZ | 功能描述:ADV3201 - Interface, Crosspoint Switch/Multiplexer Evaluation Board 制造商:analog devices inc. 系列:- 零件狀態(tài):有效 主要用途:接口，交叉點開關(guān)/多路復(fù)用器 嵌入式:- 使用的 IC/零件:ADV3201 主要屬性:32 x 32 視頻交叉點開關(guān) 輔助屬性:圖形用戶界面 所含物品:板，線纜 標(biāo)準(zhǔn)包裝:1 |
| ADV3202 | 制造商:AD 制造商全稱:Analog Devices 功能描述:300 MHz, 32 × 16 Buffered Analog Crosspoint Switch |
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