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AM79M576A-2

Description
Metering Subscriber Line Interface Circuit
File Size151KB,18 Pages
ManufacturerAMD
Websitehttp://www.amd.com
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AM79M576A-2 Overview

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)
Ring Relay
Driver
Ground-Key
Detector
Input Decoder
and Control
VCCRING
RINGOUT/DGND
C1
C2
C3
E0
E1
HPB
Two-Wire
Interface
DET
Signal
Transmission
VTX
RSN
HPA
B(RING)
Off-Hook Detector
RD
Power-Feed
Controller
RDC
DA
DB
VREG
L
VBAT
BGND
Ring-Trip
Detector
Switching
Regulator
CHS QBAT CHCLK
VCC
VEE
AGND/DGND
Publication#
18412
Rev:
D
Amendment: /0
Issue Date:
October 1999

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AM79M576A-2 AM79M576A AM79M576A-1JC AM79M576A-1 AM79M576A-2JC
Description Metering Subscriber Line Interface Circuit Metering Subscriber Line Interface Circuit Metering Subscriber Line Interface Circuit Metering Subscriber Line Interface Circuit Metering Subscriber Line Interface Circuit
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