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參數資料
| 型號： | GS9024-CTB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Automatic Cable Equalizer |
| 中文描述： | 自動電纜均衡器 |
| 文件頁數： | 6/8頁 |
| 文件大小： | 148K |
| 代理商： | GS9024-CTB |
GENNUM CORPORATION
521 - 70 - 06
6
G
Fig. 9 Output Data Waveform at 270Mb/s, 300m
Fig. 10 Output Data Waveform at 540Mb/s, 200m
DETAILED DESCRIPTION
The GS9024 Automatic Cable Equalizer is a bipolar
integrated circuit designed to equalize serial digital data
signals between 30Mbps and 622Mbps. Powered from a
single +5V or -5V supply, the device consumes
approximately 240mW of power.
The serial data signal is connected to the input pins
(SDI/SDI) either differentially or single ended. The input
signal passes through a variable gain equalizing stage
whose frequency response closely matches the inverse
cable loss characteristic. In addition, the variation of the
frequency response with control voltage imitates the
variation of the inverse cable loss characteristic with cable
length. The gain stage provides up to 40dB of gain at
200MHz which will typically result in equalization of greater
than 350m at 270Mb/s of Belden 8281 cable.
The edge energy of the equalized signal is monitored by a
detector
circuit
which
produces
corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is
integrated by an external differential AGC filter capacitor
(AGC+/AGC-) providing a steady control voltage for the
gain stage. As the frequency response of the gain stage is
automatically varied by the application of negative
feedback, the edge energy of the equalized signal is kept
at a constant level which is representative of the original
edge energy at the transmitter.
an
error
signal
The equalized signal is DC restored, thereby restoring its
logic threshold to its corrective level regardless of shifts due
to AC coupling. The digital output signals have PECL
voltage levels (800mV) and are available at pins SDO and
SDO.
1. OUTPUT HIGH Z
A HIGH Z pin allows the data outputs to be put into a high
impedance state which disconnects them from the output
traces. This feature is ideal for input expansion in router
applications as it eliminates the need for input muxes or
crosspoints.
2. SIGNAL STRENGTH INDICATION/CARRIER DETECT
The GS9024 incorporates an analog signal strength
indicator/carrier detect output (SSI/CD) which indicates
both the presence of a carrier and the amount of
equalization applied to the signal. The voltage output of this
pin versus cable length (signal strength) is shown in
Figure 11. With 0m of cable (800mV input signal levels), the
SSI/CD output voltage is approximately 4.5V.
As the cable length increases, the SSI/CD voltage
decreases linearly providing accurate correlation between
the SSI/CD voltage and cable length.
When the signal strength decreases to the level set at the
"Carrier Detect Threshold Adjust" pin, the SSI/CD voltage
goes to a logic "0" state (0.8V) and can be used to drive
other TTL/CMOS compatible logic inputs. In addition, when
loss of carrier is detected the SDO/SDO outputs are muted
(set to a known static state).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| GS9024-CTBE3 | 制造商:Gennum Corporation 功能描述:Automatic Cable Equalizer 14-Pin SOIC T/R |
| GS9025 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:GENLINX II Serial Digital Receiver |
| GS9025 44PQFP | 制造商:Gennum Corporation 功能描述: |
| GS9025A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial Digital Receiver |
| GS9025A_05 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Serial Digital Receiver |
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