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PBL38611-2 Datasheet(PDF) 1 Page - Ericsson

Part No. PBL38611-2
Description  Subscriber Line Interface Circuit
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Maker  ERICSSON [Ericsson]
Homepage  http://www.ericsson.com
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PBL38611-2 Datasheet(HTML) 1 Page - Ericsson

 
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Description
The PBL 386 11/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar inte-
grated circuit for use in DAML, FITL and other telecommunications equipment. The
PBL 386 11/2 has been optimized for low total line interface cost and a high degree
of flexibility in different applications.
The PBL 386 11/2 emulates a transformer equivalent dc-feed, programmable
between 2x25
Ω and 2x900 Ω, with short loop current limiting adjustable to max
65 mA.
A second lower battery voltage may be connected to the device 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 SLIC incorporates loop current, ground key and ring trip detection functions. The
PBL 386 11/2 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 line voltages are suppressed by a feedback loop in the SLIC and the
longitudinal balance specifications meet Bellcore TR909 requirements.
The PBL 386 11/2 package are 28-pin PLCC and 28 pin SSOP.
Figure 1. Block diagram.
February 2000
PBL 386 11/2
Subscriber Line
Interface Circuit
Key Features
• Selectable overhead voltage principle
– All adaptive: The overhead voltage
follows 0.6 V
Peak < signals < 5 VPeak.
– Semi adaptive: The overhead
voltage follows 2.5 V
Peak < signals <
5 V
Peak.
• Metering 1.6 V
rms
• High and low battery with automatic
switching
• Battery supply as low as -10V
• Only +5V in addition to GND
and battery (VEE optional)
• 35 mW on-hook power dissipation in
active state
• Long loop battery feed tracks V
Bat for
maximum line voltage
• 44V open loop voltage @ -48V battery
feed
• Constant loop voltage for line
leakage <5 mA
• On-hook transmission
• Full longitudinal current capability
during on-hook
• Programmable loop & ring-trip detector
threshold
• Ground key detector
• Analog temperature guard
• Silent polarity reversal
• Integrated Ring Relay Driver
28-pin plastic PLCC and 28-pin SSOP
1
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
VEE
VBAT2
VBAT
AGND
C3
BGND
Comparator
Ground Key
Detector
Ring Relay
Driver
RRLY
PLD
PLC
PSG
TS
AOV
VEE
PBL
386
11/2


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