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AM79R79-2JC Scheda tecnica(PDF) 1 Page - Advanced Micro Devices

Il numero della parte AM79R79-2JC
Spiegazioni elettronici  Ringing Subscriber Line Interface Circuit
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Produttore elettronici  AMD [Advanced Micro Devices]
Homepage  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79R79-2JC Scheda tecnica(HTML) 1 Page - Advanced Micro Devices

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Publication# 19752
Rev: G Amendment: /0
Issue Date: October 1999
Am79R79
Ringing Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
I Ideal for short-loop applications
I Ideal for ISDN terminal adaptor and fixed radio
access applications
I On-chip ringing with on-chip ring-trip detector
I Low standby state power
I Battery operation:
—VBAT1: –40.5 V to –75 V
—VBAT2: –19 V to VBAT1
I On-chip battery switching and feed selection
I On-hook transmission
I Two-wire impedance set by single external
impedance
I Programmable constant-current feed
I Programmable Open Circuit voltage
I Programmable loop-detect threshold
I Current gain = 1000
I Ground-key detector
I Tip Open state for ground-start lines
I Polarity reversal option available
I Internal VEE regulator (no external –5 V power
supply required)
I Two on-chip relay drivers and snubber circuits
(32 PLCC)
BLOCK DIAGRAM
E1
D2
D1
Two-Wire
Interface
HPA
HPB
Input Decoder
and Control
Relay
Driver
Ring-Trip
Detector
Power-Feed
Controller
RTRIP1
RTRIP2
BGND
VCC VNEG
RD
RDC
AGND/DGND
VBAT2
A(TIP)
B(RING)
RYOUT1
RDCR
C1
Switch
Driver
VBAT1
RSGL
Ground-Key
Detector
Off-Hook
Detector
Relay
Driver
RYOUT2
C2
C3
RSGH
B2EN
RSN
VTX
Signal
Transmission
RINGIN
RYE
DET


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