参数资料
| 型号： | XRT73LC00AIV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 30/61页 |
| 文件大小： | 0K |
| 描述： | IC LIU STS1/DS3/E3 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： | 3.135 V ~ 3.465 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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页当前第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页
XRT73LC00A
33
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.2
3.2
The Receive Equalizer Block
After the XRT73LC00A has received the incoming line signal via the RTIP and RRING input pins, the first block
that this signal passes through is the AGC (Automatic Gain Control) circuit followed by the Receive Equalizer.
As the line signal is transmitted from a given transmitting terminal, the pulse shapes at that location are
basically square. These pulses consist of a combination of “Low” and “High” frequency Fourier components.
As this line signal travels from the transmitting terminal via the coaxial cable to the receiving terminal, it is
subjected to frequency-dependent loss. The higher-frequency components of the signal is subjected to a
greater amount of attenuation than the lower-frequency components. If this line signal travels over reasonably
long cable lengths (e.g., greater than 450 feet), then the shape of the pulses which were originally square is
distorted and inter-symbol interference increases.
The purpose of the Receive Equalizer is to equalize the distortion of the incoming signal due to cable loss. The
Receive Equalizer accomplishes this by subjecting the received line signal to frequency-dependent
amplification which attempts to counter the frequency dependent loss that the line signal has experienced and
to restore the shape of the line signal so that the transmitted data and clock can be recovered reliably.
3.2.1
Guidelines for Setting the Receive Equalizer
This data sheet presents guidelines for setting the Receive Equalizer, for the following conditions.
1. If the overall cable length from the local Receiving Terminal to the remote Transmitting Terminal is NOT
known.
2. If the overall cable length from the local Receiving Terminal to the remote Transmitting Terminal is known.
3.2.1.1
If the Overall Cable Length is NOT Known
This section presents recommendations on what state to set the Receive Equalizer when the overall cable-
length from the local Receiving Terminal to the remote Transmitting Terminal is NOT known. For DS3, STS-1
and E3 applications, enable the Receive Equalizer by setting either the REQDIS input pin “low” or the REQDIS
bit-field to “0”.
The remainder of this section provides an explanation why we recommend enabling the
Receive Equalizer for these applications.
3.2.1.1.1
The Use of the Receive Equalizer in a Typical DS3 or STS-1 Application
Most System Manufacturers of equipment supporting DS3 and STS-1 lines interface their equipment to either
a DSX-3 or STSX-1 Cross-Connect. While installing their equipment the Transmit Line Build-Out circuit is set
to the proper setting that makes the transmit output pulse compliant with the Isolated DSX-3 or STSX-1 Pulse
FIGURE 18. RECOMMENDED SCHEMATIC FOR INTERFACING THE RECEIVE SECTION OF THE XRT73LC00A TO THE
LINE (CAPACITIVE-COUPLING)
R1
75
RTIP
RRING
C1
0.01uF
C2
0.01uF
Receive Line Signal
相关PDF资料 |
PDF描述 |
|---|---|
| XRT73LC03AIV-F | IC LIU E3/DS3/STS-1 3CH 120LQFP |
| XRT73LC04AIV-F | IC LIU E3/DS3/STS-1 4CH 144LQFP |
| XRT73R06IB-F | IC LIU E3/DS3/STS-1 6CH 217BGA |
| XRT73R12IB-L | IC LIU E3/DS3/STS-1 12CH 420TBGA |
| XRT75L00DIV-F | IC LIU E3/DS3/STS-1 SGL 52TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT73LC00AIVTR | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| XRT73LC00AIVTR-F | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| XRT73LC00IV | 制造商:EXAR 制造商全称:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73LC03A | 制造商:EXAR 制造商全称:EXAR 功能描述:3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73LC03A_08 | 制造商:EXAR 制造商全称:EXAR 功能描述:3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
发布紧急采购，3分钟左右您将得到回复。