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參數(shù)資料
| 型號(hào)： | XR-T5794 |
| 廠商： | Exar Corporation |
| 英文描述： | Quad E-1 Line Interface Unit |
| 中文描述： | 四的E - 1線路接口單元 |
| 文件頁(yè)數(shù)： | 13/20頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | XR-T5794 |
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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:
Driver output impedance is less than 5
.
V
s
, 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
R
L
= Load Resistance
Rs
1:n
3
Vs
4
1
2
R
L
V
O
Figure 6. Equivalent Impedance Schematic
2. Calculate equivalent output voltage and load
resistance without the transformer.
Req
R
L
n
2
Veq
V
o
n
Rs
V
eq
Vs
Figure 7. Equivalent Simplified Schematic
Req
3.
Calculate the source resistance, R
S
.
Rs
Req
Vs
Veq
1
4.
Now calculate the theoretical return loss.
Return Loss
20 log
Req
Req
Rs
Rs
The calculation given below uses the recommended
1:1.265 ratio transformer as an example:
Transformer Ratio = 1 :1.265
V
O
= 3.0V Peak
R
L
= 120
Req
R
L
n
2
120
1.6
75
Veq
V
o
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
75
67.4
67.4
25.5dB
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT5794ES | 制造商:EXAR 制造商全稱:EXAR 功能描述:Evaluation System |
| XRT5794ES-PLCC | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 4 CH E1 AFE RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT5794ES-TQFP | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 4 CH E1 AFE RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XR-T5794IJ | 制造商:EXAR 制造商全稱:EXAR 功能描述:Quad E-1 Line Interface Unit |
| XRT5794IJ-F | 功能描述:外圍驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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