QLX4600LIQT7 Intersil, QLX4600LIQT7 Datasheet - Page 20

• 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
DETECTION THERESHOLD (DT) PIN FUNCTIONALITY
The QLx4600-SL30 is capable of maintaining periods of line silence on any of its four channels by monitoring each channel for loss of signal
(LOS) conditions and subsequently muting the outputs of a respective channel when such a condition is detected. A reference current applied
to the detection threshold (DT) pin is used to set the LOS threshold of the internal signal detection circuitry. Current control on the DT pin is
done via one or two external resistors. Nominally, both a pull up and pull down resistor are tied to the DT pin (figure 17a), but if adequate
control of the supply voltage is maintained to within ±3% of 1.2V, then a simple pull down resistor is adequate (as in figure 17b). Resistors
used should be at least 1/16W, with ±1% precision.
FIGURE 17a
FIGURE 17b
FIGURE 17c
The internal bias point of the DT pin, nominally 1.05V, is used in conjunction with the voltage divider (R1 and R2) shown in Figure 17a to set
the reference current on the DT pin.
Case 1: Channels with less than or equal to 25dB loss at 2.5GHz (1 – 6Gb/s):
μ
For signals transmitted on channels having less than or equal to 25dB of loss at 2.5GHz, the optimal DT reference current is 0
A. This
optimal reference current may be achieved by either leaving the DT pin floating, or tying the DT pin to ground (GND) with a 10M Ohm resistor
Case 2: Channels with greater 25dB loss at 2.5GHz (1 – 6Gb/s):
For channels exhibiting more than 25dB of total loss (this includes cable or FR-4 loss) the DT pin should be configured for a reference sink
current (coming out of the DT pin) of approximately 2µA. A typical configuration for a 2µA sink current is given in Figure 17c. If the
configuration in Figure 17b is utilized, a 525k Ohm resistor would be used.
QLx4600-SL30 v3.0
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