Description
The PBL 386 15/1 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated
circuit for use in ISDN Network Terminal Adapters, DAML, FITL and other short loop
telecommunication equipment which often are remote powered, and by that, the
available power is limited. The PBL 386 15/1 has been optimized for low total line
interface cost, low power and requires a minimum of external components.
The PBL 386 15/1 has constant current feed, programmable to max 30mA. The SLIC
uses a first battery voltage for On-hook . A second battery voltage is used for
Off-hook and must be connected, to reduce short loop power dissipation. The SLIC
automatically switches between the two battery supply voltages without need for
external components or external control. The loop current controls the switching
between On-hook and Off-hook battery.
The SLIC incorporates loop current, ground key and ring trip detection functions.
The PBL 386 15/1 is compatible with loop start signalling. Two- to four-wire and
four- to two-wire voice frequency (vf) signal conversion is accomplished by the SLIC
in conjunction with either a conventional CODEC/filter or with a programmable
CODEC/filter, e.g. SLAC, SiCoFi, Combo II. The programmable line terminating
impedance could be complex or real to fit every market. Longitudinal voltages are
suppressed by a feedback loop in the SLIC and the longitudinal balance specifica-
tions meet Bellcore TR909 requirements.
The PBL 386 15/1 package is a very PCB space efficient 28-pin SSOP.
Figure 1. Block diagram.
February 2000
PBL 386 15/1
Subscriber Line
Interface Circuit
Applications
ISDN Network terminals
DAML
FITL
Shortloop applications
Key Features
Small footprint with SSOP package
On-hook and Off-hook battery with
automatic switching, controlled by
loop current
On-hook battery current is limited
to 6 mA
37 mW on-hook power dissipation in
active state
Metering 0.5 Vrms (0.7 Vpeak)
Adaptive Overhead Voltage
The overhead voltage follows
1Vpeak<signals<2.5Vpeak
Battery supply as low as -10V
Only +5V in addition to GND
and battery (VEE optional)
Open loop voltage tracks On-hook
battery
Full longitudinal current capability
during On-hook
43.5V open loop voltage @ -48V
battery feed
Automatic compensation for
line leakage up to 5 mA
On-hook transmission
Programmable loop & ring-trip
detector threshold
Ground key detector
Analog temperature guard with status
exclusively viewed at detector output
Integrated Ring Relay Driver
Silent polarity reversal
Linevoltage measurement
Package: 28-pin SSOP
1
Preliminary Information
VF Signal
Transmission
Off-hook
Detector
Line Feed
Controller
and
Longitudinal
Signal
Suppression
Ring Trip
Two-wire
Interface
Input
Decoder and
Control
C1
C2
DET
REF
LP
VTX
RSN
DT
DR
TIPX
HP
RINGX
VCC
VBAT2
VBAT
AGND
C3
BGND
Comparator
Ground Key
Detector
Ring Relay
Driver
RRLY
PLD
PLC
PSG
TS
VEE
(optional)
PBL 386 15/1
PBL 386 15/1
2
Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Temperature, Humidity
Storage temperature range
T
Stg
-55
+150
C
Operating temperature range
T
Amb
-40
+110
C
Operating junction temperature range, Note 1
T
J
-40
+140
C
Power supply, -40
C
T
Amb
+85
C
V
CC
with respect to AGND
V
CC
-0.4
6.5
V
V
EE
with respect to AGND
V
EE
V
Bat
0.4
V
V
Bat2
with respect to A/BGND
V
Bat2
V
Bat
0.4
V
V
Bat
with respect to BGND, continuous
V
Bat
-75
0.4
V
V
Bat2
with respect to BGND, 10 ms
V
Bat2
-80
0.4
V
Power dissipation
Continuous power dissipation at T
Amb
+85
C
P
D
0.8
W
Ground
Voltage between AGND and BGND
V
G
-5
VCC
V
Relay Driver
Ring relay supply voltage
BGND +13
V
Ring relay current
75 mA
Ring trip comparator
Input voltage
V
DT
, V
DR
V
Bat
V
CC
V
Input current
I
DT
, I
DR
-5
5
mA
Digital inputs, outputs (C1, C2, C3, DET)
Input voltage
V
ID
-0.4
V
CC
V
Output voltage (DET not active)
V
OD
-0.4
V
CC
V
Output current (DET)
I
OD
30
mA
TIPX and RINGX terminals, -40
C < T
Amb
< +85
C, V
Bat
= -50 V
TIPX or RINGX current
I
TIPX
, I
RINGX
-110
+110
mA
TIPX or RINGX voltage, continuous (referenced to AGND), Note 2
V
TA
, V
RA
V
Bat
2
V
TIPX or RINGX, pulse < 10 ms, t
Rep
> 10 s, Note 2
V
TA
, V
RA
V
Bat
- 20
5
V
TIPX or RINGX, pulse < 1
s, t
Rep
> 10 s, Note 2
V
TA
, V
RA
V
Bat
- 40
10
V
TIP or RING, pulse < 250 ns, t
Rep
> 10 s, Note 3
V
TA
, V
RA
V
Bat
- 70
15
V
Recommended Operating Condition
Parameter
Symbol
Min
Max
Unit
Ambient temperature
T
Amb
-40
+85
C
V
CC
with respect to AGND
V
CC
4.75
5.25
V
V
EE
with respect to AGND
V
EE
V
Bat
-4.75
V
V
Bat
with respect to BGND
V
Bat
-58
-10
V
V
Bat2
with respect to BGND
V
Bat2
V
Bat
-10
V
Notes
1.
The circuit includes thermal protection. Operation above max. junction temperature may degrade device reliability.
2.
A diode in series with the VBat input increases the permitted continuous voltage and pulse < 10 ms to -85 V.
A pulse
1
s is increased to the greater of |-70V| and |VBat -40V|.
3.
R
F1
and R
F2
20
is also required. Pulse is supplied to TIP and RING outside R
F1
and R
F2
.
PBL 386 15/1
3
Electrical Characteristics
-40
C
T
Amb
+85
C, V
CC
= +5V
5 %, V
EE
= -5V
5%, V
Bat
= -58V to -40V, V
Bat2
= -22V, R
LC
=18.7k
(I
L
= 27 mA),
R
L
= 600
, R
LD
= 50 k
, R
F1
, R
F2
= 0
, R
Ref
= 15k
, C
HP
= 68nF, C
LP
=0.47
F, R
T
= 120 k
, R
RX
= 120 k
, Current definition:
current is positive if flowing into a pin. Active state includes active normal and active reverse states unless otherwise specified.
Battery definition: V
Bat
= On-hook battery, V
Bat2
= Off-hook battery.
Ref
Parameter
fig
Conditions
Min
Typ
Max
Unit
Two-wire port
Overload level, V
TRO
2
Active state
Off-Hook, I
LDC
10 mA
1% THD, Note 1
1.0
V
Peak
On-Hook, I
LDC
5 mA
1.0
V
Peak
Metering I
LDC
10 mA
Z
LTTX
= 200
, f = 16 kHz
0.7
V
Peak
Input impedance, Z
TR
Note 2
Z
T
/200
Longitudinal impedance, Z
LoT
, Z
LoR
0 < f < 100 Hz
20
35
/wire
Longitudinal current limit, I
LoT
, I
LoR
active state
12
mA
rms
/wire
Longitudinal to metallic balance, B
LM
IEEE standard 455-1985, ZTRX = 736
0.2 kHz < f < 1.0 kHz
53
70
dB
1.0 kHz < f < 3.4 kHz
53
70
dB
Longitudinal to metallic balance, B
LME
3
active state
E
Lo
B
LME
= 20 Log
0.2 kHz
f
1.0 kHz
53
70
dB
V
TR
1.0 kHz < f < 3.4 kHz
53
70
dB
Longitudinal to four-wire balance, B
LFE
3
active state
E
Lo
B
LFE
= 20 Log
0.2 kHz
f
1.0 kHz
59
70
dB
V
TX
1.0 kHz < f < 3.4 kHz
59
70
dB
Metallic to longitudinal balance, B
MLE
4
active state
V
TR
B
MLE
= 20 Log
;E
RX
= 0
0.2 kHz < f < 3.4 kHz
40
58
dB
V
Lo
Figure 2. Overload level, V
TRO
, two-wire
port
1
<< R
L
, R
L
= 600
wC
R
T
= 120 k
, R
RX
= 120 k
Figure 3. Longitudinal to metallic (B
LME
)
and Longitudinal to four-wire (B
LFE
)
balance
1
<< 150
, R
LR
= R
LT
= R
L
/2= 300
wC
R
T
= 120 k
, R
RX
= 120 k
PBL 386 15/1
TIPX
RINGX
RSN
VTX
R
T
R
RX
E
RX
R
L
V
TRO
I
LDC
C
PBL 386 15/1
TIPX
RINGX
RSN
VTX
R
T
R
RX
V
TX
R
LT
C
V
TR
R
LR
E
Lo
PBL 386 15/1
4
Parameter
fig
Conditions
Min
Typ
Max
Unit
Four-wire to longitudinal balance, B
FLE
4
active state
E
RX
B
FLE
= 20 Log
V
Lo
0.2 kHz < f < 3.4 kHz
40
58
dB
Two-wire return loss, r
|Z
TR
+ Z
L
|
r = 20 Log
|Z
TR
- Z
L
|
0.2 kHz < f < 0.5 kHz
25
dB
0.5 kHz < f < 1.0 kHz
27
dB
1.0 kHz < f < 3.4 kHz, Note 3
23
dB
TIPX idle voltage, V
Ti
active normal, I
L
= 0
- 1.3
V
RINGX idle voltage, V
Ri
active normal, I
L
= 0
V
Bat
+3.1
V
|V
TR
|
active, I
L
= 0
|V
Bat
+5.5| |V
Bat
+ 4.5|
V
Four-wire transmit port (V
TX
)
Overload level, V
TXO
5
Off-hook, I
L
10mA
Load impedance > 20 k
,
0.5
V
Peak
On-hook, I
L
5mA
1% THD, Note 4
0.5
V
Peak
Output offset voltage,
V
TX
-60
60
mV
Output impedance, z
TX
0.2 kHz < f < 3.4 kHz
5
20
Four-wire receive port (RSN)
Receive summing node (RSN) dc voltage
I
RSN
= 0 mA
GND +25
mV
Receive summing node (RSN) impedance
0.2 kHz < f < 3.4 kHz
10
50
Receive summing node (RSN)
0.3 kHz < f < 3.4 kHz
current (I
RSN
) to metallic loop current (I
L
)
400
ratio
gain,
RSN
Frequency response
Two-wire to four-wire, g
2-4
6
relative to 0 dBm, 1.0 kHz. E
RX
= 0 V
0.3 kHz < f < 3.4 kHz
-0.15
0.15
dB
f = 8.0 kHz, 12 kHz, 16 kHz
-0.5
0
0.1
dB
Figure 4. Metallic to longitudinal and
four-wire to longitudinal balance
1
<< 150
, R
LT
= R
LR
= R
L
/2
=300
C
R
T
= 120 k
, R
RX
= 120 k
Figure 5. Overload level, V
TXO
, four-wire
transmit port
1
<< R
L
, R
L
= 600
C
R
T
= 120 k
, R
RX
= 120 k
Ref
PBL 386 15/1
TIPX
RINGX
RSN
VTX
R
T
R
RX
E
RX
R
LT
C
V
TR
R
LR
V
Lo
PBL 386 15/1
TIPX
RINGX
RSN
VTX
R
T
R
RX
R
L
I
LDC
C
E
L
V
TXO
PBL 386 15/1
5
Four-wire to two-wire, g
4-2
6
relative to 0 dBm, 1.0 kHz. E
L
= 0 V
0.3 kHz < f < 3.4 kHz
-0.15
0.15
dB
f = 8 kHz, 12 kHz,
-1.0
-0.2
0
dB
16 kHz
-1.0
-0.3
0
dB
Four-wire to four-wire, g
4-4
6
relative to 0 dBm, 1.0 kHz. E
L
= 0 V
0.3 kHz < f < 3.4 kHz
-0.15
0.15
dB
Insertion loss
Two-wire to four-wire, G
2-4
6
0 dBm, 1.0 kHz, Note 5
V
TX
G
2-4
= 20 Log
,E
RX
= 0
V
TR
-6.22
-6.02
-5.82
dB
Four-wire to two-wire, G
4-2
6
0 dBm, 1.0 kHz, Notes 5, 6
V
TR
G
4-2
= 20 Log
,E
G
= 0
E
RX
-0.2
0.2
dB
Gain tracking
Two-wire to four-wire R
LDC
2k
6
Ref. -10 dBm, 1.0 kHz, Note 7
-40 dBm to +3 dBm
-0.1
0.1
dB
-55 dBm to -40 dBm
-0.2
0.2
dB
Four-wire to two-wire R
LDC
2k
6
Ref. -10 dBm, 1.0 kHz, Note 7
-40 dBm to +3 dBm
-0.1
0.1
dB
-55 dBm to -40 dBm
-0.2
0.2
dB
Noise
Idle channel noise at two-wire
C-message weighting
7
12
dBrnC
(TIPX-RINGX)
Psophometrical weighting
-83
-78
dBmp
Note 8
Harmonic distortion
Two-wire to four-wire
6
0 dBm, 1.0 kHz test signal
-50
dB
Four-wire to two-wire
0.3 kHz < f < 3.4 kHz
-50
dB
Battery feed characteristics
Constant loop current, I
LConst
13
I
LProg
= 500
R
LC
18 < I
LProg
< 30 mA
0.95 I
LProg
I
LProg
1.05 I
LProg
mA
Ref
Parameter
fig
Conditions
Min
Typ
Max
Unit
Figure 6.
Frequency response, insertion loss,
gain tracking.
1
<< R
L
, R
L
= 600
C
R
T
= 120 k
, R
RX
= 120 k
PBL 386 15/1
TIPX
RINGX
RSN
VTX
R
T
R
RX
E
RX
R
L
V
TR
I
LDC
C
E
L
V
TX
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