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參數(shù)資料
| 型號(hào)： | PBL38773/1SO |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類(lèi)： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁(yè)數(shù)： | 26/64頁(yè) |
| 文件大?。?/td> | 1052K |
| 代理商： | PBL38773/1SO |
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Ringing FlexiSLIC
PBL 38773/1
Transmission
Data Sheet
32
DS1, 2003-06-18
5.2
Two-Wire Impedance
To calculate
Z
TR, the impedance presented to the two-wire line by the SLIC including the
line protection resistors
R
F, let VRX = 0.
From Equation [1] and Equation [2]:
[4]
Thus with
Z
TR, G2-4S, αRSN and RF known:
[5]
5.3
Two-Wire to Four-Wire Gain
From Equation [1] and Equation [2] with
V
RX = 0:
[6]
I
L
Is the AC metallic current.
R
F
Is a line over voltage protection resistor.
G
2-4S
Is the SLIC two-wire to four-wire gain (transmit direction) with a nominal
value of 0.5.
Z
L
Is the total line impedance.
Z
RX
Controls four- to two-wire gain.
Z
T
Determines the SLIC TIPX to RINGX AC impedance for signals at voice
frequencies.
V
RX
Is the analog ground referenced receive signal.
α
RSN
Is the receive summing node current to metallic loop current gain.
α
RSN = 400
R
HP
Internal resistor, approx. 400 k
, filters the AC signal together with C
HP
Z
TR
Z
T
α
RSN
G
×
24S
–
------------------------------------2
R
F
+
=
Z
T
α
RSN
G
24S
–
Z
TR
2
R
F
–
()
×
=
G
24
–
V
TX
V
TR
---------
Z
T
α
RSN
Z
T
α
RSN
G
×
24S
–
------------------------------------2
R
F
+
-----------------------------------------------------
==
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