Subscriber Line Interface Circuit
Am79489
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
Ideal for low power sensitive ...
Description
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
Test Relay Driver Ring Relay Driver
TESTOUT RINGOUT
A(TIP)
C1 HPA
Two-Wire Interface Ring-Trip Comparator Ground-Key Detector Loop Detector Input Decoder and Control
C2 C3 C4 E1
HPB
B(RING)
Signal Transmission Power-Feed Controller Switch Control
DET RD VTX RSN RDC CAS OVH RFA
VBAT2 VBAT1 BGND BSWOUT BSWEN BSWTH
VCC
AGND/DGND
Publication# 080201 Rev: E Amendment: /0 Issue Date: October 1999
ORDERING INFORMATION Standard Products
Legerity standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below.
Am79489
–1
J
C
TEMPERATURE RANGE C = Commercial (0°C to 70°C)*
PACKAGE TYPE J = 32-pin Plastic Leaded Chip Carrier (PL 032) PERFORMANCE GRADE OP...
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