參數(shù)資料
型號： XRT75L04IVTR-F
廠商： Exar Corporation
文件頁數(shù)： 24/57頁
文件大?。?/td> 0K
描述： IC LIU E3/DS3/STS-1 4CH 176LQFP
標準包裝： 1,000
類型： 線路接口裝置（LIU）
驅(qū)動器/接收器數(shù)： 4/4
規(guī)程： DS3，E3，STS-1
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 176-LQFP
供應(yīng)商設(shè)備封裝： 176-TQFP（24x24）
包裝： 帶卷 (TR)
XRT75L04
28
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
REV. 1.0.4
The Pulse Shaper Block also includes a Transmit Build Out Circuit, which can either be disabled or enabled by
setting the TxLEV_n input pin “High” or “Low” (in Hardware Mode) or setting the TxLEV_n bit to “1” or “0” in the
control register (in Host Mode).
For DS3/STS-1 rates, the Transmit Build Out Circuit is used to shape the transmit waveform that ensures that
transmit pulse template requirements are met at the Cross-Connect system. The distance between the
transmitter output and the Cross-Connect system can be between 0 to 450 feet.
For E3 rate, since the output pulse template is measured at the secondary of the transformer and since there is
no Cross-Connect system pulse template requirements, the Transmit Build Out Circuit is always disabled.
4.3.1
Guidelines for using Transmit Build Out Circuit:
If the distance between the transmitter and the DSX3 or STSX-1, Cross-Connect system, is less than 225 feet,
enable the Transmit Build Out Circuit by setting the TxLEV_n input pin “Low” (in Hardware Mode) or setting the
TxLEV_n control bit to “0” (in Host Mode).
If the distance between the transmitter and the DSX3 or STSX-1 is greater than 225 feet, disable the Transmit
Build Out Circuit.
4.3.2
Interfacing to the line:
The differential line driver increases the transmit waveform to appropriate level and drives into the 75
load as
shown in Figure 6.
4.4
Transmit Drive Monitor:
This feature is used for monitoring the transmit line for occurrence of fault conditions such as a short circuit on
the line or a defective line driver.
To activate this function, connect MTIP_n pins to the TTIP_n lines via a 270
resistor and MRing_n pins to
TRing_n lines via 270
resistor as shown in Figure 16.
Case 1:
MTIP_1 connected to TTIP_1
MRING_1 connected to TRING_1
TxMON_1 (bit) = 0
As shown in the figure 18, connect MTIP_1 to TTIP_1 and MRING_1 to TRING_1 via the 270
resistors.
When no transitions on the line are detected for 128 ± 32 TxClk_1 periods, the DMO_1 pin will toggle “High”.
FIGURE 16. TRANSMIT DRIVER MONITOR SET-UP.
3k
+
1
%
TTIP(n)
TRING(n)
XRT75L04 (0nly one channel shown)
1:1
R3
75
TxPOS(n)
TxNEG(n)
TxLineClk(n)
TPOS(n)
TNEG(n)
TxCLK(n)
RxB
RxA
31.6
+ 1%
31.6
+1%
R1
R2
MRING(n)
MTIP(n)
R5 270
R4 270
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XRT75L06DIB-F 功能描述:外圍驅(qū)動器與原件 - PCI 6-Ch DS3, E3, STS-1 RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
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