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参数资料
| 型号： | PBL386302SOT |
| 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： | 13/16页 |
| 文件大小： | 134K |
| 代理商： | PBL386302SOT |
PBL 386 30/2
13
Figure 11. Single-channel subscriber line interface with PBL 386 30/2 and combination CODEC/filter.
RESISTORS: (Values according to IEC E96
series)
R
SG
= 0
R
LD
= 49,9 k
R
OV
= User programmable
R
LC
= 32,4 k
R
REF
= 49,9 k
R
R
= 64,9 k
R
T
= 105 k
R
TX
= 24,9 k
R
B
= 22,1 k
R
RX
= 52,3 k
R
FB
Depending on CODEC / filter
R
1
= 604 k
R
2
= 604 k
R
3
= 249 k
R
4
= 280 k
R
RT
= 330
R
F1
, R
F2
= Line resistor, 40
1% match
R
P1
, R
P2
= 10
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
1% 1/10 W
5% 2 W
1% 1/10 W,(Note 1)
CAPACITORS: (Values according to IEC
E96 series)
C
VB
= 100 nF
C
VB2
= 150 nF
C
VCC
= 100 nF
C
TC
= 2,2 nF
C
RC
= 2,2 nF
C
HP
= 47 nF
C
LP
= 150 nF
C
TX
= 100 nF
C
GG
= 220 nF
C
1
= 330 nF
C
2
= 330 nF
100 V 10%
100 V 10%
10 V 10%
100 V 10%
100 V 10%
100 V 10%
100 V 10%
10 V 10%
100 V 10%
63 V 10%
63 V 10%
DIODES:
D
VB
D
VB2
D
BB
= 1N4448
= 1N4448
= 1N4448
OVP:
Secondary protection ( e. g. Power
Innovations TISPPBL2). The ground
terminals of the secondary protection should
be connected to the common ground on the
Printed Board Assembly with a track as
short and wide as possible, preferable a
groundplane.
R
LC
R
RX
R
REF
R
LD
C
VCC
C
TX
PBL 386 30/2
R
TX
0
0
CODEC/
Filter
R
FB
SYSTEM CONTROL
INTERFACE
R
R
R
T
R
B
-
+
VCC
VCC
BGND
TIPX
VBAT
VBAT2
PLC
POV
PLD
VCC
PSG
NC
LP
DT
NC
DET
C1
C2
RRLY
HP
NC
RINGX
AGND
RSN
NC
REF
PTG
VTX
DR
NU
PBL 386 30/2
R
OV
R
SG
C
LP
C
1
R
4
C
2
R
3
C
HP
VB2
SLIC No. 2 etc.
C
RC
R
P2
R
P1
R
F2
R
F1
TIP
RING
OVP
C
GG
C
TC
VB
+12 V /+5V
K
R
C
VB
D
VB2
C
VB2
D
BB
VB
D
VB
R
RT
E
RG
R
2
R
1
Programmable overhead
voltage(POV)
With the POV function the overhead
voltage can be increased.
If the POV pin is left open the overhead
voltage is internally set to 3,2 V
in off-
hook and 1,3 V
on-hook. If a resistor
R
is connected between the POV pin
and AGND, the overhead voltage can be
set to higher values, typical values can
be seen in figure 10. The R
and
corresponding V
(signal headroom)
are typical values for THD <1% and the
signal frequency 1000Hz.
Observe that the 4-wire output terminal
V
can not handle more than 3,2 V
Peak.
So if the gain 2-wire to 4-wire is 0dB,
3,2 V
is maximum also for the 2-wire
side. Signal levels between 3,2 and
6,4 V
on the 2-wire side can be
handled with the PTG shorted so that the
gain G
become -6,02dB. Please note
that the two-wire impedance, R
and the
4-wire to 4-wire gain has to be recalcu-
lated if the PTG is shorted.
Please note that the maximum signal
current at the 2-wire side can not be
greater than 9 mA.
How to use POV:
1. Decide what overhead voltage(V
TRO
) is
needed. The POV function is only
needed if the overhead voltage
exceeds 3,2 V
2. In figure 10 the corresponding R
OV
for
the decided V
can be found.
3. If the overhead voltage exceeds
3,2 V
, the G
gain has to be
changed to -6,02dB by connecting the
PTG pin to AGND. Please note that
the two-wire impedance, R
and the 4-
wire to 4-wire gain has to be recalcu-
lated.
NOTE:
1. R
P1
and R
P2
may be omitted if D
VB
is in place.
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