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参数资料
| 型号： | PBL386502SOT |
| 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： | 1/16页 |
| 文件大小： | 141K |
| 代理商： | PBL386502SOT |
Description
The PBL 386 50/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated
circuit for use in Central Office Metering applications and other telecommunications
equipment. The PBL 386 50/2 has been optimized for low total line interface cost and
a high degree of flexibility in different applications.
The PBL 386 50/2 emulates resistive loop feed, programmable between 2x50
and 2x900
, with short loop current limiting adjustable to max 45 mA. In the current
limited region the loop feed is nearly constant current with a slight slope
corresponding to 2x30k
.
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 50/2 is compatible with both loop and ground start signaling.
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
two-wire impedance, complex or real, is set by a simple external network.
Longitudinal voltages are suppressed by a feedback loop in the SLIC and the
longitudinal balance specifications meet Bellcore TR909 requirements.
The PBL 386 50/2 package options are 24-pin SSOP, 24-pin SOIC or 28-pin PLCC.
Figure 1. Block diagram.
June 1999
PBL 386 50/2
Subscriber Line
Interface Circuit
Key Features
24-pin SSOP package
Programmable two-wire signal
headroom for 2.2 V
rms
metering
High and low battery with automatic
switching
Only +5 V feed in addition to battery
Selectable transmit gain (0.5x or 0.25x)
70 mW on-hook power dissipation in
active state
On-hook transmission
Long loop battery feed tracks Vbat for
maximum line voltage
No power-up sequence
43V open loop voltage @
-48V battery feed
Constant loop voltage for line leakage
<5 mA (RLeak ~ >10 k
@ -48V)
Full longitudinal current capability
during on-hook state
Analog over temperature protection
permits transmission while the
protection circuit is active
Line voltage measurement
Polarity reversal
Ground key detector
Tip open state with ring ground
detector
24-pin SOIC, 24-pin SSOP, 28-pin PLCC
1
RRLY
C1
C2
C3
DET
PSG
REF
LP
PLD
PLC
VTX
RSN
PTG
BGND
AGND
VBAT
VBAT2
VCC
HP
RINGX
TIPX
DR
DT
Ring Relay
Driver
Input
Decoder
and
Control
Ring Trip
Comparator
Ground Key
Detector
Line Feed
Controller
and
Longitudinal
Signal
Suppression
Off-hook
Detector
VF Signal
Transmission
Two-wire
Interface
POV
386502
PBL386502
PL365/
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