QLX4600LIQT7 Intersil, QLX4600LIQT7 Datasheet - Page 12

• Manufacturer Part Number: QLX4600LIQT7
• Description: IC EQUALIZER REC 6.25GBPS 46QFN
• Manufacturer: Intersil
• Series: QLx™r

Specifications of QLX4600LIQT7

• Applications: Data Transport
• Voltage - Supply: 1.1 V ~ 1.3 V
• Package / Case: 46-WQFN
• Mounting Type: Surface Mount
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Other names: QLX4600LIQT7-TR

QLx4600-SL30
CML INPUT AND OUTPUT BUFFERS
The input and output buffers for the high-speed data channels in the QLx4600-SL30 are implemented using CML. Equivalent input and output
circuits are shown in Figures 9 and 10.
FIGURE 10: CML OUTPUT EQUIVALENT CIRCUIT
FIGURE 9: CML INPUT EQUIVALENT CIRCUIT
FOR THE QLx4600-SL30
FOR THE QLx4600-SL30
The load value of 52Ω is used to internally match
SDD22 for a characteristic impedance of 50Ω.
LINE SILENCE / ELECTRICAL IDLE / QUIESCENT MODE
Line silence is commonly broken by the limiting amplification in other equalizers. This disruption can be detrimental in many systems that rely
on line silence as part of the protocol. The QLx4600-SL30 contains special lane management capabilities to detect and preserve periods of
line silence while still providing the fidelity-enhancing benefits of limiting amplification during active data transmission. Line silence is detected
by measuring the amplitude of the equalized signal and comparing that to a threshold set by the current at the DT pin. When the amplitude
1
falls below the threshold, the output driver stages are muted and held at their nominal common mode voltage
.
LOS INDICATOR
Pins LOS[k] are used to output the state of the muting circuitry to serve as a loss of signal indicator for channel k. This signal is directly derived
from the muting signal off the DT-threshold signal detector output. The LOS signal goes ‘HIGH’ when the power signal is below the DT
threshold and ‘LOW’ when the power goes above the DT threshold. This feature is meant to be used in optical systems (e.g. QSFP) where
there are no quiescent or electrical-idle states. In these cases, the DT threshold is used to determine the sensitivity of the LOS indicator.
Note 1: The output common mode voltage remains constant during both active data transmission and output muting modes.
QLx4600-SL30 v3.0
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©2009 Quellan, Inc