AM79514 Datasheet, PDF (1/18 Pages) Advanced Micro Devices – Subscriber Line Interface Circuit

Am79514
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s Programmable constant-current feed
s Programmable loop-detect threshold
s On-chip switching regulator for low-power
dissipation
s Polarity reversal feature
s Optimized for –60 V battery
BLOCK DIAGRAM
s Line feed characteristics independent of
battery variations
s Two-wire impedance set by single external
impedance
s Tip Open state for ground-start lines
s Ring and test relay drivers
s On-hook transmission
A(TIP)
HPA
HPB
B(RING)
DA
DB
VREG
L
VBAT
BGND
Two-Wire
Interface
Ground-Key
Detector
Signal
Transmission
Off-Hook
Detector
Power-Feed
Controller
Ring-Trip
Detector
Switching
Regulator
Test Relay Driver
Ring Relay Driver
Input Decoder
and Control
TESTOUT
RINGOUT
C1
C2
C3
C4
E1
DET
VTX
RSN
RD
RDC
CHS QBAT CHCLK
VCC VEE AGND/DGND
Publication# 18411 Rev: D Amendment: /0
Issue Date: October 1999