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參數(shù)資料
| 型號： | PBL38773/1SO |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 28/64頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | PBL38773/1SO |
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Ringing FlexiSLIC
PBL 38773/1
Transmission
Data Sheet
34
DS1, 2003-06-18
converted by
R
TX to a current flowing into the same summing node. These currents can
be made to cancel by letting:
[11]
The four-wire to four-wire gain, G
4-4, includes the required phase shift and thus the
balance network
Z
B can be calculated from:
[12]
When selecting the
R
TX resistance value, make sure the load resistance on the VTX
terminal is at least 20 k
, i.e.:
[13]
Figure 10
Hybrid Function
5.7
Longitudinal Impedance
A feedback loop within the SLIC counteracts longitudinal voltages at the two-wire port by
injecting longitudinal currents in opposing phase. Thus longitudinal disturbances will
appear as longitudinal currents and the TIPX and RINGX terminals will experience very
small longitudinal voltage excursions, leaving metallic voltages well within the SLIC
common mode range.
V
TX
R
TX
---------
V
RX
–
Z
B
-------------
0
=
E
L
0
=
()
Z
B
R
TX
V
RX
V
TX
----------
×
R
TX
Z
RX
Z
T
---------
×
Z
T
α
RSN
G
×
24S
–
------------------------------------
Z
L
2
R
++
Z
L
2
R
F
+
---------------------------------------------------------------
×
=
–
=
Z
T
R
TX
×
Z
T
R
TX
+
-----------------------
20k
≥
Codec/Filter
VTX
RSN
Z
T
Z
RX
Hybrid_73
PBL 387 73
R
TX
Z
B
V
RX
R
FB
V
T
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