TRANSMIT
參數資料
型號: XRT75L03IV-F
廠商: Exar Corporation
文件頁數: 40/92頁
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 3CH 128LQFP
標準包裝: 72
類型: 線路接口裝置(LIU)
驅動器/接收器數: 3/3
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: 128-LQFP 裸露焊盤
供應商設備封裝: 128-LQFP(14x20)
包裝: 托盤
XRT75L03
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
REV. 1.0.4
42
4.1
TRANSMIT CLOCK:
The Transmit Clock applied via TxClk_n pins, for the selected data rate (for E3 = 34.368 MHz, DS3 = 44.736
MHz or STS-1 = 51.84 MHz), is duty cycle corrected by the internal PLL circuit to provide a 50% duty cycle
clock to the pulse shaping circuit. This allows a 30% to 70% duty cycle Transmit Clock to be supplied.
4.2
B3ZS/HDB3 ENCODER:
When the Single-Rail (NRZ) data format is selected, the Encoder Block encodes the data into either B3ZS
format (for either DS3 or STS-1) or HDB3 format (for E3).
4.2.1
B3ZS Encoding:
An example of B3ZS encoding is shown in Figure 14. If the encoder detects an occurrence of three
consecutive zeros in the data stream, it is replaced with either B0V or 00V, where ‘B’ refers to Bipolar pulse that
is compliant with the Alternating polarity requirement of the AMI (Alternate Mark Inversion) line code and ‘V’
refers to a Bipolar Violation (e.g., a bipolar pulse that violates the AMI line code). The substitution of B0V or
00V is made so that an odd number of bipolar pulses exist between any two consecutive violation (V) pulses.
This avoids the introduction of a DC component into the line signal.
4.2.2
HDB3 Encoding:
An example of the HDB3 encoding is shown in Figure 15. If the HDB3 encoder detects an occurrence of four
consecutive zeros in the data stream, then the four zeros are substituted with either 000V or B00V pattern. The
substitution code is made in such a way that an odd number of pulses exist between any consecutive V pulses.
This avoids the introduction of DC component into the analog signal.
FIGURE 14. B3ZS ENCODING FORMAT
FIGURE 15. HDB3 ENCODING FORMAT
00
0
1
V
B
V
1
0
00
0
00
0
V
BV
0
00
TClk
Line
Signal
TPDATA
0
00
0
1
V
B
V
1
00
0
00
V
0
00
TClk
Line
Signal
TPDATA
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相關代理商/技術參數
參數描述
XRT75L03IVTR 功能描述:時鐘合成器/抖動清除器 3CH E3/DS3/STS1 JITTER ATTENUATOR RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
XRT75L03IVTR-F 功能描述:時鐘合成器/抖動清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
XRT75L04 制造商:EXAR 制造商全稱:EXAR 功能描述:FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER
XRT75L04D 制造商:EXAR 制造商全稱:EXAR 功能描述:FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
XRT75L04DES 功能描述:時鐘合成器/抖動清除器 4CH T3/E3/STS1 LIU+DESYNCH 3.3V RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel