CYV15G0103EQ
Equalizer Operation
MUTE
The CYV15G0103EQ is a high speed adaptive cable equalizer
designed to equalize standard definition (SD) and high definition
(HD) serial digital interface (SDI) video data streams. The
CYV15G0103EQ equalizer is optimized to equalize up to 175m
of Belden 1694A and Canare L-5CFB cable at 270 Mbps and up
to 70m of Belden 1694A and Canare L-5CFB cable at 1.485
Gbps. The CYV15G0103EQ equalizer contains one power
supply and typically consumes 160 mW power at 3.3V. The multi
rate equalizer meets the SMPTE 259M, SMPTE 292M, SMPTE
344M, and DVB-ASI video standards. It meets all pathological
requirements for SMPTE 292M as defined by RP198 and for
SMPTE 259M as defined by RP178. The CYV15G0103EQ multi
rate cable equalizer operates from 143 Mbps to 1.485 Gbps
serial data rate.
MUTE is an input pin that controls the muting of the equalizer’s
output. MUTE operates for both HD and SD data rates.
If MUTE is set LOW, the equalizer serial outputs are not muted.
If MUTE is set HIGH, then the equalizer serial outputs are muted.
When MUTE is active, the BYPASS setting is also ignored.
Connecting CD to MUTE enables automatic muting of the
equalizer when the signal is lost.
Do not leave the MUTE pin floating. Always drive it to a known
state.
Carrier Detect (CD)
Carrier Detect is an active LOW output pin that indicates the
presence of a valid incoming data signal. When the incoming
data signal is present, and maximum cable length does not
exceed that set by MCLADJ, CD outputs a voltage less than
0.8V.
The CYV15G0103EQ equalizer has multiple variable gain equal-
ization stages that reverse the cable attenuation effects. This
equalization is achieved by separate regulation of the lower and
higher frequency components in the signal to give a clean output
eye diagram. The CYV15G0103EQ has DC restoration to
compensate for the DC content of the SMPTE pathological
patterns.
When the incoming data stream is not present, or maximum
cable length exceeds that set by MCLADJ, CD outputs a voltage
greater than 2.8V.
Connecting CD to MUTE enables automatic muting of the
equalizer upon loss of signal.
SDI, SDI
CYV15G0103EQ accepts single-ended or differential serial
video data streams over 75Ω coaxial cable. It is recommended
to AC couple the SDI and SDI inputs because they are internally
biased to 1.2V.
BYPASS
The CYV15G0103EQ has a bypass mode that enables the user
to bypass the equalizer’s equalization and DC restoration
functions. When BYPASS is set HIGH, the signal presented at
the equalizer’s differential serial inputs (SDI, SDI) is routed to the
equalizer’s differential serial outputs (SDO, SDO) without
performing equalization.
SDO, SDO
The CYV15G0103EQ has differential serial output interface
drivers that use Current Mode Logic (CML) drivers to provide
source matching for the transmission line. These outputs are
either AC coupled or DC coupled to HOTLink II receivers.
When BYPASS is set LOW, the incoming video data stream is
equalized and presented at the equalizer‘s differential serial
outputs (SDO, SDO).
MCLADJ
AGC
Maximum Cable Length Adjust (MCLADJ) sets the approximate
maximum amount of cable to be equalized. When the maximum
cable length set by MCLADJ is reached, the CD pin deasserts.
MCLADJ works at SD and HD data rates.
Place a 1 μF capacitor between the AGC and AGC pins of the
CYV15G0103EQ equalizer.
The graph in Figure 2 on page 7 illustrates the voltage required
at the MCLADJ input to equalize various Belden 1694A cable
lengths. The same graph applies for Canare L-5CFB cables.
If MCLADJ functionality is not needed, then this pin should be left
floating or tied to ground to allow maximum equalized cable
length.
Document Number: 001-12874 Rev. **
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