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参数资料
| 型号： | PBL386302QNT |
| 厂商： | ERICSSON |
| 英文描述： | AC/DC CAPACITANCE=0.5 VOLT=2000 |
| 中文描述： | 用户线接口电路 |
| 文件页数： | 12/16页 |
| 文件大小： | 134K |
| 代理商： | PBL386302QNT |
PBL 386 30/2
12
tions and to fit both single and dual battery
feed CODECs. The RSN terminal, con-
necting to the CODEC receive output via
the resistor R
, is dc biased with +1,25V.
This makes it possible to compensate for
currents floating due to dc voltage differ-
ences between RSN and the CODEC out-
put without using any capacitors. This is
done by connecting a resistor R
between
the RSN terminal and ground. With current
directions defined as in figure 13, current
summation gives:
where V
is the reference voltage of the
CODEC at the receive output.
From this equation the resistor R
R
can be
calculated as
For values on I
RSN
, see table 3.
The resistor R
R
transmission.
SLIC
I
RSN
[
μ
A]
PBL 386 30/2
-55
Table 3. The SLIC nternal bias current with
the direction of the current defined as posi-
tive when floating into the terminal RSN.
Battery Feed
The PBL 386 30/2 SLIC emulate resistive
loop feed, programmable between 2·50
and 2·900
, with adjustable current limita-
tion. In the current limited region the loop
current has a slight slope corresponding to
2·30 k
, see figure 12 reference B.
The open loop voltage measured be-
tween the TIPX and RINGX terminals is
tracking the battery voltage V
. The sig-
nalling headroom, or overhead voltage V
,
is programmable with a resistor R
con-
nected between terminal POV on the SLIC
and ground. Please refer to section “Pro-
grammable overhead voltage(POV)”.
The battery voltage overhead, V
, de-
pends on the programmed signal overhead
voltage. V
defines the TIP to RING volt-
age at open loop conditions according to
V
TR
(at I
= 0 mA) = |V
| - V
.
Refer to table 2 for typical values on V
and V
. The overhead voltage is changed
when the line current is approaching open
loop conditions. To ensure maximum open
loop voltage, even with a leaking telephone
line, this occurs at a line current of approxi-
mately 6 mA. When the overhead voltage
has changed, the line voltage is kept nearly
constant with a steep slope corresponding
to 2·25
(reference G in figure 12).
The virtual battery overhead, V
, is
defined as the difference between the bat-
tery voltage and the crossing point of all
possible resistive feeding slopes, see fig-
ure 12 reference J. The virtual battery over-
head is a theoretical constant needed to be
able to calculate the feeding characteris-
tics.
SLIC
V
(V)
V
(V)
PBL 386 30/2
3.0 +V
TRO
4.9 +V
TRO
Table 2. Battery overhead.
The resistive loop feed (reference D in
figure 12) is programmed by connecting a
resistor, R
, between terminals PSG and
VBAT according to the equation:
R
= R
+ 2 · 10
4
+ 2R
F
200
where R
Feed
is in
for R
SG
and R
F
in
.
The current limit (reference C in figure
12) is adjusted by connecting a resistor,
R
, between terminal PLC and ground
according to the equation:
R
= 1000
I
LProg
+ 4
where R
LC
is in k
for I
LProg
in mA.
A second, lower battery voltage may be
connected to the device at terminal VBAT2
to reduce short loop power dissipation. The
SLIC automatically switches between the
two battery supply voltages without need
for external control. The silent battery
switching occurs when the line voltage
passes the value
|VB2| - 40·I
- (V
-1,3), if I
> 6mA.
For correct functionality it is important to
connect the terminal VBAT2 to the second
power supply via the diode D
in figure 11.
An optional diode D
connected be-
tween terminal VB and the VB2 power
supply, see figure 11, will make sure that
the SLIC continues to work on the second
battery even if the first battery voltage dis-
appears.
If a second battery voltage is not used,
VBAT2 is connected to VBAT on the SLIC
and C
VB2
, D
BB
and D
VB2
are removed.
Metering applications
For designs with metering applications
please contact Ericsson Microelectronics
for assistance.
CODEC Receive Interface
The PBL 386 30/2 SLIC have got a com-
pletely new receive interface at the four
wire side which makes it possible to reduce
the number of capacitors in the applica-
=
+
+
=
+
R
+
I
I
I
I
R
V
R
RSN
RT
RRX
RR
T
CODEC
RX
R
125
,
125
,
125
,
R
I
R
V
R
R
RSN
T
CODEC
RX
=
125
,
125
,
125
,
Figure 10. Programmable overhead voltage (POV). R
L
= 600
or
∞
.
0
10
20
30
40
50
60
0
1
2
3
4
5
6
7
off-hook
on-hook
V
P
)
Rov (K
)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PBL386302QNTNT | 制造商:Infineon Technologies AG 功能描述:POTS |
| PBL386302SHT | 制造商:ERICSSON 制造商全称:Ericsson 功能描述:Subscriber Line Interface Circuit |
| PBL386302SOAXT | 制造商:Infineon Technologies AG 功能描述:SLIC 1-CH 66dB 45mA 5V 24-Pin DSO T/R |
| PBL386302SOS | 制造商:ERICSSON 制造商全称:Ericsson 功能描述:Subscriber Line Interface Circuit |
| PBL386302SOSZE | 制造商:Infineon Technologies AG 功能描述:POTS |
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