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參數(shù)資料
| 型號(hào)： | L3235T |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用戶線接口電路 |
| 文件頁(yè)數(shù)： | 16/26頁(yè) |
| 文件大小： | 457K |
| 代理商： | L3235T |
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Two wire impedance
To calculate the impedance presented to the two
wire line by the SLIC including the protection re-
sistorsR
p
and definedas Z
S
let:
V
rx
= 0
Il/50’ = Il/50 (in first approximation)
Rp = 50
Z
S
= Z
AC
/25 + 2R
P
Z
AC
to make Z
S
= 600
Z
AC
= 25
(Z
S
- 2R
P
)
Z
AC
= 25
(600 - 100)
Z
AC
= 12.5K
Two wire to four wire gain
(Txgain)
Let V
rx
= 0
G
tx
=V
tx
V
l
V
tx
V
l
Z
AC
+
50R
P
Example: Calculate Gtx making R
PC
= 50
R
P
G
tx
=
2
Z
AC
+
50
R
P
Z
AC
+
50
R
P
=
2
As you can see the RPC resistor is providing the
compensation of the insertion loss introduced by
the two external protectionresistors R
P
.
= 2
Z
AC
+
R
PC
Four wire to two wire gain
(Rx gain)
Let Eg = 0
G
rx
=V
l
V
rx
25
(
Z
l
+
2R
P
)
+
Z
AC
Example:
Calculate G
rx
making Z
AC
= 25
(Z
ML
- 2
R
P
)
50
Z
l
25
(
Z
l
+
2R
P
2R
P
+
Z
ML
)
=
50
Z
l
G
rx
=
G
rx
=
2
Z
l
Z
l
+
Z
ML
In particular for Z
S
= Z
l
: G
rx
= 1
Hybrid function
To calculatedthe transhybridloss (Thl) let: Eg = 0
Thl =
=
VT
x
50
(
2
R
P
+
Z
l
)
2R
AC
)
Example:
Calculating Thl making R
S
= 50
R
P
, Z
S
= 25
(ZSlic - 2
R
P
)
Z
B
Z
B
+
Z
A
In particularifZ
A
Z
B
Z
l
Thl = 0
From the above relation it is evident that if Z
S
is
equal to the Z
l
used in Thl test, the two Z
A
, Z
B
im-
pedancescan be two resistor of the same value.
VR
x
=
4
(
Z
B
Z
B
+
Z
A
50
(
2
R
P
+
Z
l
)
2R
PC
Thl = 4
(
Z
l
Z
l
+
Z
ML
)
=
Z
S
ACtransmissioncircuit stability
To ensure stability of the feedback loop shown in
block diagram form in figure 15 two capacitorsare
required. Figure 16 includes these capacitors Cc
and Ch.
AC - DCseparation
The high pass filter capacitor C
AC
provides the
separationbetween DC circuitsand AC circuits. A
CAC value of 100mF will position the low end fre-
quencyresponse 3dBbreak pointat 7Hz,
fsp =
1
2
π
220
C
AC
Figure15:
Simplified AC Circuits
L3234 - L3235
16/26
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L3234 | CAP CER 1.5UF 50V 20% X7R 1812 |
| L3235N | HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| L3235 | CAP CER 1.5UF 100V 10% X7R 1812 |
| L34024 | Optoelectronic |
| L34035 | Optoelectronic |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L323C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|15A I(T) |
| L323ED | 制造商:Kingbright Corporation 功能描述:LED Uni-Color Orange 625nm 2-Pin |
| L323F | 制造商:CRYDOM 制造商全稱:Crydom Inc., 功能描述:Power Modules |
| L323GD | 制造商:Kingbright Corporation 功能描述:LED Uni-Color Green 565nm 2-Pin |
| L-323GD | 制造商:Kingbright Corporation 功能描述: |
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