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PDF CLC034 Data sheet ( Hoja de datos )

Número de pieza CLC034
Descripción SMPTE 292M / 259M Adaptive Cable Equalizer
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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PRELIMINARY
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CLC034
SMPTE 292M / 259M Adaptive Cable Equalizer
General Description
The CLC034 SMPTE 292M / 259M adaptive cable equalizer
is a monolithic integrated circuit for equalizing data transmit-
ted over cable (or any media with similar dispersive loss
characteristics). The equalizer operates over a wide range of
data rates from 143 Mbps to 1.485 Gbps and supports
SMPTE 292M, SMPTE 344M and SMPTE 259M.
The CLC034 implements DC restoration to correctly handle
pathological data conditions. DC restoration can be by-
passed for low data rate applications. The equalizer is flex-
ible in allowing either single-ended or differential input drive.
Additional features include a combined carrier detect and
output mute pin which mutes the output when no signal is
present. A programmable mute reference is used to mute the
output at a selectable level of signal degradation. A cable
length indicator is provided to determine the amount of cable
being equalized.
Features
n SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
n Supports DVB-ASI at 270Mbps
n High data rates: 143 Mbps to 1.485 Gbps
n Equalizes up to 140 meters of Belden 1694A at 1.485
Gbps or up to 350 meters of Belden 1694A at 270 Mbps
n Manual bypass, cable length indicator, and output mute
with a programmable threshold
n Single-ended or differential input
n 50differential outputs
n Single 3.3V supply operation
n Replaces the GS1524
Applications
n SMPTE 292M, SMPTE 344M, and SMPTE 259M serial
digital interfaces
Typical Application
© 2005 National Semiconductor Corporation DS200859
20085901
www.national.com

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CLC034 pdf
Block Diagram
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Device Operation
BLOCK DESCRIPTION
The Equalizer block is a multi-stage adaptive filter. If Bypass
is high, the equalizer is disabled.
The DC Restore block receives the differential signals from
the equalizer filter block. This block incorporates a self-
biasing DC restore circuit to fully DC restore the signals. If
Bypass is high, this function is disabled.
The Output block produces SDO and SDO.
The Cable Length Indicator provides a voltage to indicate
the length of cable being equalized.
The Mute Reference determines the amount of cable to
equalize before muting the outputs. This is set by applying a
voltage proportional to the required length of cable. The
higher the voltage, the lower the mute threshold.
Carrier Detect / Mute is bi-directional, serving two pur-
poses. As an output, carrier detect monitors the signal power
out of the equalizing filter and compares it to the mute
reference to determine if a valid signal is present. Carrier
detect provides a high voltage when no signal is present.
Mute can be forced on or off by using this pin as an input.
20085902
Mute is forced off if this pin is tied to ground, and the outputs
will always mute if this pin is tied to VCC.
The loop response in the AEC block is controlled by an
external 1µF capacitor placed across the AEC+ and AEC-
pins.
INPUT INTERFACING
The CLC034 accepts either differential or single-ended in-
put. The input must be AC coupled. Transformer coupling is
not supported.
The CLC034 correctly handles equalizer pathological signals
for standard definition and high definition serial digital video,
as described in SMPTE RP 178 and RP 198, respectively.
OUTPUT INTERFACING
The SDO and SDO outputs are internally loaded with 50.
They produce a 750 mVP-P differential output, or a
375 mVP-P single-ended output.
REPLACING THE GENNUM GS1524
The CLC034 is form-fit-function compatible with the Gennum
GS1524.
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