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參數(shù)資料
| 型號(hào)： | L3235N |
| 英文描述： | HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS |
| 中文描述： | 高度集成的用戶接口盒針對(duì)交換機(jī)與關(guān)鍵系統(tǒng)應(yīng)用 |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 3164K |
| 代理商： | L3235N |
AC Characteristic
A simplified AC model of the transmission circuits
is shown in figure 13
Where:
V
rx
is the received signal
V
tx
is the transmitted signal
V
l
is the AC transversal voltage in line
E
G
is the line open circuit AC voltage
Z
L
is the line impedance
R
P
are the protection resistors
ZB
is the line impedance balancing network
Z
A
is the SLIC impedance balancing network
Z
AC
programmable AC line termination
impedance
R
PC
used for external protection resistors
insertion loss compensation
I
l
/50
is the AC transversal current divided by 50
CAC
AC feedback current decoupling
AC behavior
The AC path simplified formulas, that are valid
when Il/50’ is equal to Il/50, are the following :
Two wire impedance
The impedance presented to the two wire by
the SLIC including the protection resistors RP
and defined as Zs is equal to :
Zs = ZAC/12.5 + 2RP
i.e. with ZAC = 6250 W and Rp = 50 W
Zs = 600 W
Two wire to four wire gain
The transmission gain , Gtx, of the SLIC is
equal to :
GTX = Vtx / Vl
GTX = 0.25 * (RPC + ZAC) / (25RP + ZAC)
using RPC = 25RP , as recommended to
compensate the protection resistor RP,
GTX = 0.25 (-12 dB)
Four wire to two wire gain
The receiver gain , Grx, of the SLIC is equal to:
GRX = Vl / Vrx
GRX = 50Zl / (ZAC +12.5(Zl + 2RP))
using ZAC = 12.5(Zs - 2RP) and assuming
Zl = Zs we have the following gain:
GRX = 2 (+6 dB)
Hybrid function
The transybrid loss, Thl, is equal to:
Thl = V
tx
/ V
rx
Thl = Z
B
/ (Z
A
+ Z
B
)-(Z
AC
+R
PC
) / (Z
AC
+
+ 12.5(2R
P
+ Z
l
))
using Z
AC
= 12.5(Z
S
- 2
RP
) and R
PC
= 25R
P
we have the following relation:
Thl = Z
B
/ (Z
A
+ Z
B
) - Z
l
/ (Z
l
+ Z
s
)
To maximize the hybrid attenuation the imped-
ance must be matched, Z
A
/ Z
B
= Z
S
/ Z
l
, to
guarantee Thl = 0.
From the above relation it is evident that if Z
s
is
equal to the Z
l
in Thl test the impedance Z
A
and
Z
B
can be substituted by two equal resistors.
IL/50
TX
Cac
+
-
1
RX
-
+
TIP
RING
Vrx
Vtx
ZB
ZA
ZAC
RPC
12
9
10
11
43
7
38
40
6
18
Cac
IL
Eg
RP
RP
Zl
L3235N
X2
+1
-1
IL'/50
Vl
Figure 13.
L3234 - L3235N
15/25
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