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参数资料
型号： XRT7300IV-F
厂商： Exar Corporation
文件页数： 34/55页
文件大小： 0K
描述： IC LIU E3/DS3/STS-1 SGL 44TQFP
标准包装： 160
类型： 线路接口装置（LIU）
驱动器/接收器数： 1/1
规程： DS3，E3，STS-1
电源电压： 4.75 V ~ 5.25 V
安装类型： 表面贴装
封装/外壳： 44-LQFP
供应商设备封装： 44-TQFP（10x10）
包装： 托盘
其它名称： 1016-1635
XRT7300IV-F-ND
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
II
2.2 THE TRANSMIT CLOCK DUTY CYCLE ADJUST CIRCUITRY ......................................................................... 21
2.3 THE HDB3/B3ZS ENCODER BLOCK........................................................................................................ 22
B3ZS Encoding .................................................................................................................................... 22
Figure 13.An Example of B3ZS Encoding ........................................................................................................ 22
HDB3 Encoding.................................................................................................................................... 22
Figure 14.An Example of HDB3 Encoding ........................................................................................................ 23
Enabling/Disabling the HDB3/B3ZS Encoder ...................................................................................... 23
COMMAND REGISTER CR2 (ADDRESS = 0X02 .................................................................................... 23
2.4 THE TRANSMIT PULSE SHAPER CIRCUITRY .............................................................................................. 23
Enabling the Transmit Line Build-Out Circuit ....................................................................................... 23
COMMAND REGISTER CR1 (ADDRESS = 0X01) ................................................................................... 23
Disabling the Transmit Line Build-Out Circuit ...................................................................................... 23
COMMAND REGISTER CR1 (ADDRESS = 0X01) ................................................................................... 24
Design Guideline for Setting the Transmit Line Build-Out Circuit ........................................................ 24
The Transmit Line Build-Out Circuit and E3 Applications .................................................................... 24
2.5 INTERFACING THE TRANSMIT SECTION OF THE XRT7300 TO THE LINE ..................................................... 24
Figure 15.Recommended Schematic for Interfacing the Transmit Section of the XRT7300 to the Line........... 24
TRANSFORMER RECOMMENDATIONS ........................................................................................................ 25
3.0 THE RECEIVE SECTION ......................................................................................................................... 25
3.1 INTERFACING THE RECEIVE SECTION OF THE XRT7300 TO THE LINE ....................................................... 25
Figure 16.Recommended Schematic for Interfacing the Receive Section of the XRT7300 to the Line (Transform-
er-Coupling) ........................................................................................................................................ 26
Figure 17.Recommended Schematic for Interfacing the Receive Section of the XRT7300 to the Line (Capaci-
tive-Coupling)...................................................................................................................................... 26
3.2 THE RECEIVE EQUALIZER BLOCK ............................................................................................................ 26
Figure 18. The Typical Application for the System Installer .............................................................................. 27
COMMAND REGISTER CR2 (ADDRESS = 0X02) ................................................................................... 28
3.3 PEAK DETECTOR AND SLICER ................................................................................................................. 28
3.4 CLOCK RECOVERY PLL .......................................................................................................................... 28
3.5 THE HDB3/B3ZS DECODER ................................................................................................................... 28
B3ZS Decoding DS3/STS-1 Applications ............................................................................................29
Figure 19.An Example of B3ZS Decoding ........................................................................................................ 29
HDB3 Decoding E3 Applications.......................................................................................................... 29
Figure 20.An Example of HDB3 Decoding........................................................................................................ 29
Enabling/Disabling the HDB3/B3ZS Decoder ...................................................................................... 30
COMMAND REGISTER CR2 (ADDRESS = 0X02) ................................................................................... 30
3.6 LOS DECLARATION/CLEARANCE ............................................................................................................. 30
The LOS Declaration/Clearance Criteria for E3 Applications............................................................... 30
Figure 21.The Signal Levels that the XRT7300 Declares and Clears LOS (E3 Mode Only) ............................ 31
Figure 22.The Behavior the LOS Output Indicator In Response to the Loss of Signal and the Restoration of Sig-
nal ....................................................................................................................................................... 31
The LOS Declaration/Clearance Criteria for DS3 and STS-1 Applications.......................................... 32
Table 4:The ALOS Declaration and Clearance Thresholds for a Given Setting of LOSTHR (DS3 and STS-1 Ap-
plications) for Equalizer Enabled or Disabled ...................................................................................... 32
COMMAND REGISTER CR0 (ADDRESS = 0X00) ................................................................................... 32
COMMAND REGISTER CR2 (ADDRESS = 0X02) ................................................................................... 33
COMMAND REGISTER CR0 (ADDRESS = 0X00) ................................................................................... 33
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