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參數(shù)資料
| 型號： | XRT5794IJ-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E1 QUAD 68PLCC |
| 產(chǎn)品變化通告： | Product Discontinuation 18/Jan/2012 |
| 標準包裝： | 19 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 4/4 |
| 規(guī)程： | E1 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 68-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 68-PLCC（24.23x24.23） |
| 包裝： | 管件 |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR-T5794IV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CEPT/T1 Interface |
| XRT5794IV-F | 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT5795IJ-F | 功能描述:外圍驅(qū)動器與原件 - PCI Quad E1 LIU RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT5795IV | 功能描述:LIN 收發(fā)器 Quad E-1 LIU RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
| XRT5795IV-F | 功能描述:外圍驅(qū)動器與原件 - PCI Quad E1 LIU RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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