AM79M576A Datasheet, PDF (1/18 Pages) Advanced Micro Devices – Metering Subscriber Line Interface Circuit

Am79M576A
Metering Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s Programmable constant-resistance feed
s Programmable loop-detect threshold
s Ground-key detect
s Performs polarity reversal
s Ring relay driver
s Supports 2.2 Vrms metering (12 and 16 kHz)
s Line feed characteristics independent of battery
variations
s On-chip switching regulator for low-power
dissipation
s Two-wire impedance set by single external
impedance
s Tip Open state for ground-start lines
s On-hook transmission
BLOCK DIAGRAM
A(TIP)
HPA
HPB
Two-Wire
Interface
B(RING)
DA
DB
VREG
L
VBAT
BGND
Ground-Key
Detector
Ring Relay
Driver
Input Decoder
and Control
Signal
Transmission
Off-Hook Detector
Power-Feed
Controller
Ring-Trip
Detector
Switching
Regulator
VCCRING
RINGOUT/DGND
C1
C2
C3
E0
E1
DET
VTX
RSN
RD
RDC
CHS QBAT CHCLK VCC VEE AGND/DGND
Publication# 18412 Rev: D Amendment: /0
Issue Date: October 1999