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参数资料
型号： PBL386402
厂商： ERICSSON
英文描述： Subscriber Line Interface Circuit
中文描述： 用户线接口电路
文件页数： 10/16页
文件大小： 138K
代理商： PBL386402
PBL 386 40/2
10
Transmission
General
A simplified ac model of the transmission
circuits is shown in figure 9. Circuit
analysis yields:
(1)
(2)
V
TR
= E
L
- I
L
· Z
L
(3)
where:
V
TX
is a ground referenced version of
the ac metallic voltage between the
TIPX and RINGX terminals.
G
2-4S
is the programmable SLIC two-wire
to four-wire gain (transmit
direction). See note below.
V
TR
is the ac metallic voltage between
tip and ring.
E
L
is the line open circuit ac metallic
voltage.
I
L
is the ac metallic current.
R
F
is a fuse resistor.
R
P
is part of the SLIC protection.
Z
L
is the line impedance.
Functional Description
and Applications Infor-
mation
V
Z
V
Z
I
TX
T
RX
RX
L
RSN
+
=α
Z
T
determines the SLIC TIPX to
RINGX impedance at voice
frequencies.
controls four- to two-wire gain.
is the analog ground referenced
receive signal.
α
RSN
is the receive summing node
current to metallic loop current
gain = 200.
Note that the SLICs two-wire to four-wire
gain, G
, is user programmable
between two fix values. Refer to the
datasheets for values on G
2-4S
.
Z
RX
V
RX
Two-Wire Impedance
To calculate Z
, the impedance pre-
sented to the two-wire line by the SLIC
including the fuse and protection
resistors R
F
and R
P
, let:
V
RX
= 0.
From (1) and (2):
Thus with Z
TR
,
α
RSN
, G
2-4S
, R
P
and R
F
known:
Two-Wire to Four-Wire Gain
From (1) and (2) with V
RX
= 0:
V
V
G
I
R
R
TR
TX
S
L
F
P
=
+
+
2 4
2
2
(
)
Z
Z
G
R
R
TR
T
RSN
S
F
P
=
+
+
α
2 4
2
2
Z
G
Z
R
R
T
RSN
S
TR
F
P
=
α
2 4
2
2
(
)
G
V
V
Z
Z
G
R
R
TX
TR
T
RSN
T
RSN
S
F
P
2 4
2 4
2
2
=
=
+
+
/
α
α
Four-Wire to Two-Wire Gain
From (1), (2) and (3) with E
L
= 0:
For applications where
Z
/(
α
·G
) + 2R
+ 2R
is chosen to
be equal to Z
L
the expression for G
4-2
simplifies to:
Four-Wire to Four-Wire Gain
From (1), (2) and (3) with E
L
= 0:
Hybrid Function
The hybrid function can easily be
implemented utilizing the uncommitted
amplifier in conventional CODEC/filter
combinations. Please, refer to figure 10.
Via impedance Z
a current proportional
to V
is injected into the summing node
of the combination CODEC/filter ampli-
fier. As can be seen from the expression
for the four-wire to four-wire gain a
voltage proportional to V
is returned to
V
. This voltage is converted by R
to a
current flowing into the same summing
node. These currents can be made to
cancel by letting:
V
R
Z
TX
B
The four-wire to four-wire gain, G
,
includes the required phase shift and
thus the balance network Z
B
can be
calculated from:
V
V
Z
T
+
α
Figure 9. Simplified ac transmission circuit.
V
E
TX
RX
L
+
=
=
0
0
(
)
G
Z
Z
G
T
RX
S
4 2
2 4
1
2
=
G
V
V
Z
Z
Z
Z
G
Z
R
R
TR
RX
T
RX
L
T
RSN
S
L
F
P
4 2
2 4
2
2
=
=
+
+
+
α
(
)
G
V
V
Z
Z
G
Z
R
R
Z
G
Z
R
R
TX
RX
T
RX
S
L
F
P
T
RSN
S
L
F
P
4 4
2 4
2 4
2
2
2
2
=
=
+
+
+
+
+
(
)
(
)
α
Z
R
R
Z
Z
G
Z
R
R
G
Z
R
R
B
TX
RX
TX
TX
RX
T
RSN
S
L
F
P
S
L
F
P
=
=
+
+
+
+
2 4
2 4
2
2
2
2
(
)
(
)
PBL 386 40/2
+
-
+
-
VTX
RSN
I
L
/
α
RSN
TIPX
RINGX
+
-
E
L
-
+
TIP
RING
R
F
R
F
Z
TR
Z
T
V
TX
V
RX
-
Z
RX
I
L
I
L
R
HP
+
Z
L
V
TR
R
P
G
2-4S
R
P
相关PDF资料
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相关代理商/技术参数
参数描述
PBL38640-2 制造商:ERICSSON 制造商全称:Ericsson 功能描述:Subscriber Line Interface Circuit
PBL386402QNANT 制造商:Infineon Technologies AG 功能描述:SLIC 1-CH 66dB 45mA 5V/-9V/-12V/-15V/-18V/-24V/-28V 28-Pin PLCC T/R
PBL386402QNS 制造商:ERICSSON 制造商全称:Ericsson 功能描述:Subscriber Line Interface Circuit
PBL386402QNT 制造商:ERICSSON 制造商全称:Ericsson 功能描述:Subscriber Line Interface Circuit
PBL386402QNTNT 制造商:Infineon Technologies AG 功能描述:SLIC 1-CH 66dB 45mA 5V/-9V/-12V/-15V/-18V/-24V/-28V 28-Pin PLCC T/R
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