AM79489-4JC Ver la hoja de datos (PDF) - Unspecified
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AM79489-4JC Datasheet PDF : 20 Pages
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Am79489
Subscriber Line Interface Circuit
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
A(TIP)
HPA
HPB
Two-Wire
Interface
Ring-Trip
Comparator
Ground-Key
Detector
Loop Detector
B(RING)
VBAT2
VBAT1
BGND
Switch Control
Signal
Transmission
Power-Feed
Controller
Test Relay
Driver
Ring Relay
Driver
Input
Decoder
and
Control
TESTOUT
RINGOUT
C1
C2
C3
C4
E1
DET
RD
VTX
RSN
RDC
CAS
OVH
RFA
BSWOUT BSWEN BSWTH
VCC
AGND/DGND
Publication# 080201 Rev: E Amendment: /0
Issue Date: October 1999
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