GS1524A(2005) 查看數據表（PDF） - Gennum -> Semtech

零件编号

产品描述 (功能)

生产厂家

GS1524A
(Rev.:2005)

HD-LINX®II Adaptive Cable Equalizer

Gennum -> Semtech 

GS1524A Data Sheet

SDO

SDO

50 50

+187.5mV

VCM = 2.925V

typical

-187.5mV

+187.5mV

VCM = 2.925V

typical

-187.5mV

Figure 4-1: Typical Output Voltage Levels

4.3 Programmable Mute Output and Cable Length Indicator

For SMPTE 259M inputs, the GS1524A incorporates a programmable threshold

output mute (MCLADJ) and an analog cable length indicator (CLI).

MCLADJ

In applications where there are multiple input channels using the GS1524A, it is

advantageous to have a programmable mute output to avoid signal crosstalk.

The output of the GS1524A can be muted when the input signal decreases below

a certain input level. This threshold is determined using the input voltage applied

to the MCLADJ pin. 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 is only recommended for data rates up to 360Mb/s.

CLI

The output voltage of the CLI pin is an approximation of the amount of cable

present at the GS1524A input. With 0m of cable, 800mV input signal levels, and a

data rate of 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.

NOTE: CLI is only recommended for data rates up to 360Mb/s.

28852 - 1 May 2005

12 of 16

Share Link: