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参数资料
| 型号： | PBL386652SHT |
| 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： | 1/18页 |
| 文件大小： | 184K |
| 代理商： | PBL386652SHT |
Description
The PBL 386 65/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated
circuit for use in DLC, Central Office and other telecommunications equipment. The
PBL 386 65/2 has been optimized for low total line interface cost and a high degree
of flexibility in different applications.
The PBL 386 65/2 emulates a transformer equivalent dc-feed, programmable
between 2x25
and 2x900
, 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 65/2 is compatible with loop start and ground 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 the DLC requirements.
The PBL 386 65/2 package is 28-pin PLCC and 28-pin SSOP.
Figure 1. Block diagram.
May 2000
PBL 386 65/2
Subscriber Line
Interface Circuit
Key Features
Selectable overhead voltage principle
– All adaptive: The overhead voltage
follows 0.6
V < signals < 6.2V
.
– Semi adaptive: The overhead voltage
follows 3.1V
Peak
< signals < 6.2V
Peak
.
Metering 2.2 V
rms
High and low battery with automatic
switching
Battery supply as low as -10 V
Only +5 V in addition to GND
and battery (VEE optional)
39 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
Tip open state with ring ground detector
Silent polarity reversal
Line voltage measurement
-40
°
C to +85
°
C ambient temperature
range
28-pin PLCC and 28-pin SSOP
386652
VF Signal
Transmission
Off-hook
Detector
Line Feed
Controller
and
Longitudinal
Signal
Suppression
Ring Trip
Comparator
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
Ground Key
Detector
Ring Relay
Driver
RRLY
PLD
PLC
PSG
TS
AOV
VEE
Preliminary
1
PL366/
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