FN6979.1 November 19, 2009 Detection Threshold (DT) Pin Functionality The QLx4600-S30 is capable of maintaining periods of line silence on any " />
參數(shù)資料
型號(hào)： QLX4600SIQT7
廠商： Intersil
文件頁(yè)數(shù)： 11/23頁(yè)
文件大?。?/td> 0K
描述： IC EQUALIZER REC 6.25GBPS 46QFN
標(biāo)準(zhǔn)包裝： 1
系列： QLx™
應(yīng)用： 銅電纜模塊
電源電壓： 1.1 V ~ 1.3 V
封裝/外殼： 46-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 46-TQFN
包裝： 標(biāo)準(zhǔn)包裝
安裝類型： 表面貼裝
其它名稱： QLX4600SIQT7-DKR
QLX4600SIQT7-DKR-ND
QLX4600SIQT7DKR
19
FN6979.1
November 19, 2009
Detection Threshold (DT) Pin Functionality
The QLx4600-S30 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 32A),
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 32B).
Resistors used should be at least 1/16W, with ±1%
precision.
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 32A to set the reference current on the
DT pin.
Case 1: Channels with less than or equal to 25dB loss at
2.5GHz (1Gb/s to 6Gb/s):
For signals transmitted on channels having less than
or equal to 25dB of loss at 2.5GHz, the optimal DT
reference current is 0A. This optimal reference
current may be achieved by either leaving the DT pin
floating, or tying the DT pin to ground (GND) with a
10MΩ resistor.
Case 2: Channels with greater than 25dB loss at 2.5GHz
(1Gb/s to 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 2A. A typical
configuration for a 2A sink current is given in
Figure 32C. If the configuration in Figure 32B is
utilized, a 525kΩ resistor would be used.
FIGURE 32A.
FIGURE 32B.
FIGURE 32C.
FIGURE 32.
QLx4600-S30
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