6 FN6975.2 July 19, 2012 Adjustable De-Emphasis ISL35111 features a settable de-emphasis driver for custom signal restoration. The con" />
參數(shù)資料
型號: ISL35111DRZ-T7
廠商: Intersil
文件頁數(shù): 6/9頁
文件大?。?/td> 0K
描述: IC DE-EMP DRIVER SGL 16QFN
標準包裝: 1,000
應(yīng)用: 以太網(wǎng)
電源電壓: 1.1 V ~ 1.3 V
封裝/外殼: 16-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 16-QFN(3x3)
包裝: 帶卷 (TR)
安裝類型: 表面貼裝
ISL35111
6
FN6975.2
July 19, 2012
Adjustable De-Emphasis
ISL35111 features a settable de-emphasis driver for custom
signal restoration.
The connectivity of the DE pins are used to determine the boost
de-emphasis level of ISL35111. Table 1 defines the mapping
from the 2-bit non-binary DE word to the 7 available output
de-emphasis levels.
Disable Pin
The disable (TDSBL) pin is used to disable the driver output in
order to implement TX_Disable functions of such industry
standards as SFP+ and QSFP. When this pin is pulled HIGH, the
ISL35111 will enter a low-power standby mode. For active data
transmission, this pin must be pulled LOW.
Line Silence/Quiescent Mode
The ISL35111 is capable of maintaining periods of line silence by
monitoring its input pins for loss of signal (LOS) conditions and
subsequently muting the output driver when such a condition is
detected. A reference voltage applied to the detection threshold
(DT) pin is used to set the LOS threshold of the internal signal
detection circuitry. For most applications, it is recommended to
leave the DT pin floating at its default internal bias. If the
sensitivity of the detection threshold needs to be adjusted, the DT
voltage can be adjusted with an external pull-up resistor. The
resistor values should be validated on an application-specific
basis. Connect the DT pin to ground in order to disable this
feature and prevent the outputs from muting during line silence.
FIGURE 6. CML INPUT EQUIVALENT CIRCUIT FOR THE ISL35111
FIGURE 7. CML OUTPUT EQUIVALENT CIRCUIT FOR THE ISL35111
IN[P]
IN[N]
1
st LA
Stage
VDD
50O
2kO
10kO
Ω
VDD
50O
OUT[P]
OUT[N]
Ω
TABLE 1. MAPPING BETWEEN DE-EMPHASIS LEVEL AND DE-PIN
CONNECTIVITY
DE PIN CONNECTION
NOMINAL DE-EMPHASIS
LEVEL; 10.3125Gbps TO
11.1Gbps (dB)
DE-EMPHASIS
SETTING
DE[A]
DE[B]
Open
0
Open
GND
0.6
1
Open
VDD
1.1
2
GND
Open
1.6
3
GND
2.3
4
GND
VDD
3
5
VDD
Open
4
6
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