PBL 3762A/2, /4
R
FB
U
C
HP
U
1
2
-5V
1 HPR
2 RD
HPT 22
VTX 21
VEE 21
RSN 19
AGND 18
RDC 17
C1 16
R
R
D
R
RT
R
1
TX
C
RT
R
3
-
+
R
R
3 DT
B
T
R
R
2
4
-5V
4 DR
R
F1
V
BAT
R
RX
Tip
K1 K1
5 TIPX
R
DC1
CODEC/Filter
V
A
G
B
Ring
6 RINGX
7 BGND
8 VCC
K2 K2
R
C
DC2
R
F2
C
C
C
TISP
TC RC
DC
U
3
Note 1
+5V
C2 15
+5V
D
8
9 RINGRLY
10 VBAT
11 RSG
DET 14
E0 13
D
To other line
interfaces
PTC
D
C
2
K
3
Bat
R
V
R
B
Bat
D
1
E1 12
R
SG
-5V
Ringing
+90V
System Control
Interface
(V
)
Bat
RMS
U1
U2
SLIC (Subscriber Line Interface Circuit) R4
PBL 3762A/2
1.2 MΩ, 5%, 1/4 W
5.1 Ω, 5%, 1/4 W
17.8 kΩ, 1%, 1/4 W
39 kΩ, 5%, 1/4 W
20 kΩ, 5%, 1/4 W
24.3 kΩ, 1%, 1/4 W
261 kΩ, 1%, 1/4 W
Short Circuit
CDC
CHP
CRT
3.3 µF, 20%, 10V
RBat
0.010 µF, 20%, 100V
0.39 µF, 20%, 100V
2200 pF, 20%, 100V
220nF, 20%, 100V
Combination CODEC/Filter, e.g.
TP3054 or programmable CODEC/
filter, e.g. SiCoFi
Secondary protection (e.g. Texas
Instruments TISP PBL 2)
Relay, 2C contacts, 12V coil
Diode, 1N4454
Diode, e.g. 1N4004
Line resistor, 40 Ω, 1%
200 kΩ, 5%, 1/4 W
910 kΩ, 5%, 1/4 W
RB
RD
CTC, CRC
RDC1, RDC2
CTISP
U3
RFB
RRX
RSG
RT
Note 1: The ground terminals of the
secondary protection should be
connected to the ground terminal of
the SLIC, and to the common ground
on the Printed Board Assembly with
a track as short and wide as
KR
D1
D2, D3
523 kΩ, 1%, 1/4 W
20 kΩ, 1%, 1/4 W
150 Ω, 5%, 2 W
RTX
RRT
CBat
R
F1, RF2
R1, R3
R2
0.47 µF, 20%, |VBat| + 20V
possible, preferably a groundplane.
Figure 12. Single-channel subscriber line interface with PBL 3762A/2 and combination CODEC/filter.
I
I
Ldc
V
1/20
-2.5 V
TIPX
5
6
BGND
+
17 RDC
TR
V
R
1
TR
L
-
Ldc
V
Bat
RINGX
+
V
>V
<V
1
0
TR
SG Ref
R
R
Comp.
DC2
V
-
TR
SG Ref
V
SG Ref
C
DC
RSG 11
4.9 • 105
R
VSG Ref = 16 +
VSG = -4.8 -
SG+RSGint
1.5 • 105
0.6
R
DC1
SG
V
RSG+RSGint
SG
Saturation Guard
V
EE
19 RSN
I
Ldc
1000
PBL 3762A/2
Figure 13. Battery feed (C1 ,C2= 0, 1; active state).
12
ERICSSON [ ERICSSON ]
