參數(shù)資料
型號(hào)： GS1524-CTD
廠商： Gennum Corporation
英文描述： GS1524 HD-LINX-TM II Multi-Rate SDI Adaptive Cable Equalizer
中文描述： GS1524的HD - LINX進(jìn)程，商標(biāo)第二多速率SDI自適應(yīng)電纜均衡器
文件頁(yè)數(shù)： 15/18頁(yè)
文件大?。?/td> 717K
代理商： GS1524-CTD
GS1524 Data Sheet
14976 - 7
June 2005
15 of 18
6. Cable Length Indication/Carrier Detect/Mute
For SMPTE 259M inputs the GS1524 incorporates an analog cable length indicator
(CLI) output and a programmable threshold output mute (MCLADJ). In addition, a
multi-function CD/MUTE pin allows control of the GS1524 MUTE functionality for
both SD and HD inputs.
The voltage output of CLI pin is an approximation of the amount of cable present
at the GS1524 input for data rates up to 360Mb/s. The CLI voltage versus cable
length (signal strength) is shown in
Figure 4-6
. With 0m of cable, 800mV input
signal levels and at 270Mb/s, the CLI output voltage is approximately 2.5V. As the
cable length increases, the CLI voltage decreases providing an approximate
correlation between the CLI voltage and cable length.
In applications where there are multiple input channels using the GS1524, it is
advantageous to have a programmable mute output to avoid signal crosstalk.
The output of the GS1524 can be muted when the input signal decreases below a
selectable input level. The voltage applied to the MCLADJ pin vs input cable length
is shown in
Figure 4-5
. For consistent accurate results this may need to be
calibrated for each device. The MCLADJ pin may be left unconnected for
applications where output muting is not required. This feature has been designed
for use in applications such as routers where signal crosstalk and circuit noise
cause the equalizer to output erroneous data when no input signal is present. The
use of a Carrier Detect function with a fixed internal reference does not solve this
problem since the signal to noise ratio on the circuit board could be significantly
less than the default signal detection level set by the on chip reference.
Note: MCLADJ and CLI are only recommended for data rates up to 360Mb/s.
The CD/Mute pin is a multi-function bidirectional pin that provides the following
functions:
Applying a HIGH INPUT to the CD/Mute pin forces the GS1524 outputs to a muted
condition. See the
Table 1-1: DC Electrical Characteristics
for voltage levels. In this
condition the outputs will be latched to the last logic level present at the output to
avoid signal crosstalk.
Applying a LOW INPUT to the CD/Mute pin will force the GS1524 outputs to remain
active regardless of the length of input cable and the voltage applied to the
MCLADJ pin. See the
Table 1-1: DC Electrical Characteristics
for voltage levels.
When used as an OUTPUT, the CD/Mute pin will provide an indication of the output
mute status. The CD/Mute voltage will fall to below 1.2V when the carrier is present
and the data outputs are active.
Note: The CD/Mute pin is not functional in BYPASS mode.
相關(guān)PDF資料
PDF描述
GS1524-CTDE3 GS1524 HD-LINX-TM II Multi-Rate SDI Adaptive Cable Equalizer
GS1528 GS1528 HD-LINX-TM II Multi-Rate SDI Dual Slew-Rate Cable Driver
GS1528-CKA GS1528 HD-LINX-TM II Multi-Rate SDI Dual Slew-Rate Cable Driver
GS1528-CKAE3 GS1528 HD-LINX-TM II Multi-Rate SDI Dual Slew-Rate Cable Driver
GS1528-CTA GS1528 HD-LINX-TM II Multi-Rate SDI Dual Slew-Rate Cable Driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
GS1524-CTDE3 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:HD/SD/ASI Adaptive Equalizer
GS1524-CTDE3D 制造商:Semtech Corporation 功能描述:HS/SD/ASI Adaptive Equalizer
GS1524-CTDE3Z 制造商:Semtech Corporation 功能描述:TAPE & REEL HD/SD/ASI Adaptive Equalizer
GS1528 制造商:GENNUM 制造商全稱:GENNUM 功能描述:HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver
GS1528_10 制造商:GENNUM 制造商全稱:GENNUM 功能描述:HD-LINX II Multi-Rate SDI Dual Slew-Rate Cable Driver
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