PBL38621-2 Ericsson, PBL38621-2 Datasheet

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PBL38621-2

Manufacturer Part Number
PBL38621-2
Description
Subscriber Line Interface Circuit
Manufacturer
Ericsson
Datasheet
Figure 1. Block diagram.
Description
The PBL 386 21/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated
circuit for use in DAML, FITL and other telecommunications equipment. The PBL
386 21/2 has been optimized for low total line interface cost and a high degree of
flexibility in different applications.
loop power dissipation. The SLIC automatically switches between the two battery
supply voltages without need for external components or external control.
The PBL 386 21/2 is compatible with loop start signaling.
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
the two-wire impedance, complex or real, is set by a simple external network.
longitudinal balance specifications meet Bellcore TR909 requirements.
The PBL 386 21/2 has constant current feed, programmable to max. 30 mA.
A second lower battery voltage may be connected to the device to reduce short
The SLIC incorporates loop current, ground key and ring trip detection functions.
Two- to four-wire and four- to two-wire voice frequency (VF) signal conversion is
Longitudinal voltages are suppressed by a feedback loop in the SLIC and the
The PBL 386 21/2 package options are 24-pin SSOP, 24-pin SOIC or 28-pin PLCC.
RINGX
VBAT2
AGND
BGND
VBAT
TIPX
VCC
DR
HP
DT
Two-wire
Interface
Transmission
Longitudinal
Suppression
Comparator
Ground Key
VF Signal
Line Feed
Controller
Ring Trip
Off-hook
Detector
Detector
Signal
and
PTG
Ring Relay
Decoder
Control
Driver
Input
and
C1
DET
POV
PSG
PLC
LP
PLD
REF
VTX
RSN
C2
C3
RRLY
Interface Circuit
Subscriber Line
Key Features
• 24-pin SSOP package
• High and low battery with automatic
• 60 mW on-hook power dissipation in
• On-hook transmission
• Long loop battery feed tracks Vbat for
• Only +5 V feed in addition to battery
• Selectable transmit gain (1x or 0.5x)
• No power-up sequence
• 44V open loop voltage @ -48V battery
• Full longitudinal current capability
• Analog over temperature protection
• Polarity reversal
• Integrated Ring Relay driver
• Ground key detector
• Programmable signal headroom
• -40 C to +85 C ambient temperature
switching
active state
maximum line voltage
feed
during on-hook state
permits transmission while the
protection circuit is active
range
PBL 386 21/2
24-pin SOIC, 24-pin SSOP, 28-pin PLCC
June 1999
1

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PBL38621-2 Summary of contents

Page 1

Description The PBL 386 21/2 Subscriber Line Interface Circuit (SLIC bipolar integrated circuit for use in DAML, FITL and other telecommunications equipment. The PBL 386 21/2 has been optimized for low total line interface cost and ...

Page 2

PBL 386 21/2 Maximum Ratings Parameter Temperature, Humidity Storage temperature range Operating temperature range Operating junction temperature range, Note 1 Power supply, - +85 C Amb V with respect to A/BGND CC V with respect to A/BGND Bat2 ...

Page 3

Electrical Characteristics - +85 C, PTG = open (see pin description), V Amb mA 600 , 52 unless otherwise ...

Page 4

PBL 386 21/2 Parameter Four-wire to longitudinal balance, B FLE Two-wire return loss, r TIPX idle voltage RINGX idle voltage Four-wire transmit port (VTX) Overload level, V TXO On-hook, I < 5mA L Output ...

Page 5

Parameter Four-wire to two-wire, g 4-2 Four-wire to four-wire, g 4-4 Insertion loss Two-wire to four-wire, G 2-4 Four-wire to two-wire, G 4-2 Gain tracking Two-wire to four-wire Four-wire to two-wire Noise Idle channel noise at two-wire (TIPX-RINGX) or four-wire ...

Page 6

PBL 386 21/2 Parameter Loop current detector Programmable threshold, I LTh Ground key detector Ground key detector threshold (I and I difference to trigger ground key det.) TIPX RINGX Ring trip comparator Offset voltage, V DTDR Input bias current, I ...

Page 7

Notes 1. The overload level can be adjusted with the resistor R higher levels e.g. min 3.1 V and is specified at the two- Peak wire port with the signal source at the four-wire receive port. 2. The two-wire impedance ...

Page 8

PBL 386 21/2 PTG 1 RRLY RINGX 4 24-pin SOIC BGND 5 and TIPX 6 24-pin SSOP VBAT 7 VBAT2 8 PSG Figure 7. Pin configuration, 24-pin SSOP, 24-pin SOIC ...

Page 9

C3 } C1, C2 and C3 are digital inputs (internal pull-up) controlling the SLIC operating states Refer to section "Operating states" for details DET Detector output. Active low when indicating loop detection and ring ...

Page 10

... TX load of the VTX terminal is > calculation of the Z formula above B yields a balance network containing an inductor, an alternate method is recommended. Contact Ericsson Micro- electronics for assistance. The PBL 386 21/2 SLIC may also be used together with programmable CODEC filters. The programmable CODEC/filter allows for system controller adjustment of ...

Page 11

... Table and C values for cons tant current feeding characteristics. For values outside table 1, please contact Ericsson Microelectronics for assistance. and/ PBL 386 21 Combination Z B CODEC/Filter Z RX Battery Feed The PBL 386 21/2 SLIC emulate a battery characteristic with current limitation adjustable ...

Page 12

PBL 386 21/2 switching occurs when the line voltage passes the value |VB2 · 3.6 L TRO For correct functionality it is important to connect the terminal VBAT2 to the second power supply via ...

Page 13

Figure 10. Programmable overhead voltage (POV energized, dc current flows and the comparator input voltage reverses polar- ity. Figure 11 gives an example of a ring trip detection network. ...

Page 14

PBL 386 21 +12 V /+5V R RING F2 TIP VB2 VB2 VB2 RESISTORS (Values according to IEC E96 series ...

Page 15

(@V =0V)= LProg B: Constant current C: I (typ LConst LProg V =|V |-V -50·I TR Bat OH Figure 12. Battery feed characteristics (without the protection resistors on the line). DC characteristics ...

Page 16

... Microelectronics AB' general conditions of sale, unless otherwise confirmed in writing. Specifications subject to change without notice. 1522-PBL 386 21/2 Uen Rev. A © Ericsson Microelectronics AB 1999 This product is an original Ericsson product protected by US, European and other patents. Ericsson Microelectronics AB SE-164 81 Kista-Stockholm, Sweden Telephone: +46 8 757 Part No ...

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