™
Le79489
Subscriber Line Interface Circuit
Ve580 Series
DISTINCTIVE CHARACTERISTICS
Ideal for low power sensitive applications
Low standby power (normal and reverse)
Automatic on-chip battery switching
On-chip thermal management
On-chip thermal shutdown
–20 V to –60 V battery operation
Programmable current limit
Programmable resistive feed
Programmable loop-detect threshold
Selectable overhead for metering applications
Two-wire impedance set by single external impedance
On-chip ring and test relay drivers and relay snubber
circuits
Polarity reversal (full transmission)
Loop and ground-key detector
Comparator for ring-trip detection
Ground-start capability
On-hook transmission
BLOCK DIAGRAM
TMG
DA
DB
Test Relay
Driver
Ring Relay
Driver
Ring-Trip
Comparator
Two-Wire
Interface
Ground-Key
Detector
Loop Detector
Signal
Transmission
Power-Feed
Controller
Switch Control
TESTOUT
RINGOUT
A(TIP)
C1
HPA
Input
Decoder
and
Control
C2
C3
C4
E1
HPB
DET
RD
VTX
RSN
RDC
CAS
OVH
RFA
B(RING)
VBAT2
VBAT1
BGND
BSWOUT BSWEN BSWTH
VCC
AGND/DGND
Document ID#
080201
Date:
Sep 19, 2007
Rev:
G
Version:
3
Distribution:
Public Document
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
