CYV15G0101EQ
Equalizer Operation
The CYV15G0101EQ is a high speed adaptive cable equalizer designed to equalize standard definition (SD) and high definition (HD) serial digital interface (SDI) video data streams. CYV15G0101EQ equalizer is optimized to equalize up to 350m of Canare
The CYV15G0101EQ equalizer has variable gain and multiple equalization stages that reverse the effects of the cable. 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 CYV15G0101EQ has DC restoration to compensate for the DC content of the SMPTE pathological patterns.
SDI, SDI
The CYV15G0101EQ accepts
SDO, SDO
The CYV15G0101EQ 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 the HOTLink II SerDes device.
CLI
Cable Length Indicator (CLI) is an analog output that gives an output voltage proportional to the equalized cable length. CLI gives an approximation of the length of cable at the differential serial inputs (SDI, SDI). CLI works at high definition (HD) data rates and standard definition (SD) data rates. The graph in Figure 3 on page 7 illustrates the CLI output voltage at various Belden 1694A cable lengths. With an increase in cable length, CLI output voltage decreases.
MCLADJ
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, CD is driven high and the outputs are muted. MCLADJ works at SD and HD data rates.
The graph in Figure 2 on page 7 illustrates the voltage required at MCLADJ input to equalize various Belden 1694A cable lengths for SD and HD data rates. If MCLADJ functionality is not needed, this pin should be left floating or tied to ground to allow maximum equalized cable length.
CD/MUTE
Carrier Detect/MUTE (CD/MUTE) is a bidirectional pin that provides an indication of the signal present at the equalizer’s input, or it controls the muting of the equalizer’s output. The (CD/MUTE) operates for both HD and SD data rates.
If CD/MUTE is used as an output and the incoming data stream is not present or the cable length exceeds that set by MCLADJ, the voltage at the CD/MUTE output is greater than 2.8V. If CD/MUTE is used as an output, the incoming data stream is present and the cable length does not exceed that set by MCLADJ, then the voltage at the CD/MUTE output is less than 0.8V.
If CD/MUTE is used as an input and is set LOW, the equalizer serial outputs are not muted. If the CD/MUTE is used as an input and is set HIGH, then the equalizer serial outputs are muted.
When an invalid signal or a signal transmitted with a launch amplitude of less than 500 mV at HD data rates is received, the equalizer’s serial outputs are muted.
BYPASS
The CYV15G0101EQ has a bypass mode that allows the user to bypass the equalizer’s equalization and DC restoration functions. When the bypass mode 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 equalizing.
When BYPASS is set LOW, the incoming video data stream is equalized and presented at the equalizer‘s differential serial outputs (SDO, SDO).
In equalizer bypass mode, CD/MUTE is not functional.
AGC
Place a capacitor of 1 μF between the AGC± pins of the CYV15G0101EQ equalizer.
Document Number: | Page 4 of 10 |
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