参数资料
| 型号： | XRT5794IV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC LIU E1 QUAD 80TQFP |
| 产品变化通告： | Product Discontinuation 18/Jan/2012 |
| 标准包装： | 90 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 4/4 |
| 规程： | E1 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-TQFP（14x14） |
| 包装： | 托盘 |
XR-T5794
13
Rev. 2.01
Output Transformer Selection
The 1:1.265 ratio output transformer is recommended for
the XR-T5794 because this ratio gives the best possible
transmitter output return loss for 120
balanced E1
service. However, other transformers may provide an
adequate return loss for many applications. The two
characteristics that determine series build-out resistor
requirements are:
D Driver output impedance is less than 5.
D Vs, which is the driver open circuit output voltage, is
4.5V peak.
The following method may be used to determine
transformer suitability for a given use.
1. List the application requirements.
Transformer Ratio = 1:n
Vo = Peak Output Pulse Amplitude
RL= Load Resistance
Rs
1:n
3
4
1
2
RL
VO
Vs
Figure 6. Equivalent Impedance Schematic
2.
Calculate equivalent output voltage and load
resistance without the transformer.
Req
+
R
L
n2
Veq
+
Vo
n
Rs
Veq
Vs
Figure 7. Equivalent Simplified Schematic
Req
3.
Calculate the source resistance, RS.
Rs
+ Req
Vs
Veq
* 1
4.
Now calculate the theoretical return loss.
Return Loss
+ 20 log
Req
) Rs
Req
* Rs
The calculation given below uses the recommended
1:1.265 ratio transformer as an example:
Transformer Ratio = 1 :1.265
VO = 3.0V Peak
RL = 120
Req
+
R
L
n2
+ 120
1.6
+ 75
Veq
+
Vo
n +
3.0
1.265
+ 2.37V
Rs
+ Req
Vs
Veq
* 1 + 75 4.5
2.37
* 1 + 67.4
(Datasheet specifies standard value of 68
)
Calculate the theoretical return loss to determine if the
transformer is acceptable.
Return Loss
+ 20 log 75 ) 67.4
75
* 67.4 +
25.5
dB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT5795IJ-F | 功能描述:外围驱动器与原件 - PCI Quad E1 LIU RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| XRT5795IV | 功能描述:LIN 收发器 Quad E-1 LIU RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| XRT5795IV-F | 功能描述:外围驱动器与原件 - PCI Quad E1 LIU RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| XRT5894 | 制造商:EXAR 制造商全称:EXAR 功能描述:Four-Channel E1 Line Interface (3.3V or 5.0V) |
| XRT5894ES | 功能描述:外围驱动器与原件 - PCI 4 CH E1 AFE RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
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