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參數(shù)資料
| 型號： | CLC018 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 8 x 8 Digital Crosspoint Switch, 1.4 Gbps(8 x 8數(shù)字交點開關(guān)，1.4 Gbps) |
| 中文描述： | 8 × 8數(shù)字交叉點開關(guān)，1.4吉比特（8 × 8數(shù)字交點開關(guān)，1.4 Gbps）的 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 215K |
| 代理商： | CLC018 |
Operation
(Continued)
CALCULATING THE POWER DISSIPATION IN AN
EXPANDED ARRAY
The CLC016 dissipates about 100 mW per active output plus
about 50 mW quiescent power. With all outputs active, this is
about 850 mW. In an expanded array, all devices will dissi-
pate quiescent power, but only those devices with active out-
puts will dissipate the 100 mW/output. So, an N-by-M device
array (an 8xN-input-by-8xM-output switch) with all outputs
active will dissipate N x M x 50 mW + 8 x M x 100 mW. A 32-
input x 32-output (4 x 4 device) switch array dissipates 4 x 4
x 50 mW + 8 x 4 x 100 mW = 4W.
CONTROLLED IMPEDANCE TRANSMISSION LINES
AND OTHER LAYOUT TECHNIQUES
All transmission lines whose length is greater than
1
4
wave-
length of the highest frequencies present in the transmitted
signal require proper attention to impedance control to avoid
distortion of the signal. Digital signals are especially suscep-
tible to distortion due to poorly controlled line characteristics
and reflections. With its 250 ps output transitions, which im-
ply a bandwidth of 4 GHz or more, transmission lines driven
by the CLC018 must be carefully designed and correctly ter-
minated. Either microstrip line, which resides on the outer
surfaces of a printed circuit board and paired with an image
ground plane, or stripline, which is sandwiched in an inner
layer between image ground planes, may be used in
CLC018 designs. With either line type, it is important to
maintain a uniform characteristic impedance over the entire
extent of the transmission line system. Likewise, the receiv-
ing end of these lines must be terminated in a resistance
equal to the characteristic impedance to preserve signal fi-
delity. Figure 13shows representative methods of interfacing
to and from the CLC018.
Often, when voltage-mode drivers, such as ECL, with low
output impedance (also called equivalent generator resis-
tance) are used to drive bus networks, a series resistor con-
nects the output of the amplifier to the transmission line. This
resistor serves both as a termination for any signals travel-
ling toward the source- end of the line and as the series leg
of a voltage divider (with the transmission line as the shunt
leg) to reduce the transmitted signal level. This resistor’s cor-
rect value is Z
R
. However, a value equal to Z
may
be used successfully in most situations. The receiving end of
the line is terminated in a resistance equal to the value of Z
O
of the receiving end of the line. A resistance equal to the
line’s Z
works in most situations. In cases where the bus is
heavily loaded, the receiving end termination’s value may
need to be reduced to the loaded- Z
of the line. (Please see
the material on distributed loading effects on line character-
istics in the Fairchild F100K ECL 300 Series Databook and
Design Guide).
Current-mode drivers, with their high equivalent generator
resistance, when used as bus drivers require a resistance
equal to Z
at each end of the bus to either power or ground
as appropriate for the design.
Adetailed discussion of digital transmission line design tech-
niques is beyond the scope of this data sheet, but many
good references are available from National Semiconductor
and others. Extensive material is available in the National In-
terface Databook , the Fairchild F100K ECL 300 Series Da-
tabook and Design Guide and the Motorola MECL System
Design Handbook.
Especially useful is the National Semiconductor Transmis-
sion Line RAPIDESIGNER
r
Sliderule and user manual AN-
905. The RAPIDESIGNER is available by calling the Na-
tional Semiconductor Customer Response Center in your
area and asking for either Literature Number 633200-001
(ISO Metric units) or 633201-001 (English units). The User
Manual for both versions is Literature Number 100905-002
and is available on our WEB Site at http://www.national.com
as AN-905.
C
www.national.com
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CLC018_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8 x 8 Digital Crosspoint Switch, 1.485 Gbps |
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| C-LC01-E3-KIT | 制造商:TDK 功能描述:KIT CAP CER HI CAP MLCC SMD |
| CLC020 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SMPTE 259M Digital Video Serializer with Integrated Cable Driver |
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