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AM7945 Datasheet(PDF) 1 Page - Advanced Micro Devices

No. de pieza AM7945
Descripción Electrónicos  Subscriber Line Interface Circuit
Download  18 Pages
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Fabricante Electrónico  AMD [Advanced Micro Devices]
Página de inicio  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM7945 Datasheet(HTML) 1 Page - Advanced Micro Devices

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Publication# 18408
Rev: D Amendment: /0
Issue Date: October 1999
Am7945
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s Programmable constant-current feed
s Current gain = 200
s Programmable loop-detect threshold
s Low power Standby state
s Ground-key detector
s Tip Open state for ground-start lines
s –19 V to –56.5 V battery operation
s On-chip Thermal Management (TMG) feature
s Two-wire impedance set by single external
impedance
s On-hook transmission
s On-chip ring relay driver and relay snubber
circuit
s Ideal for low cost PABX and key telephone
systems
BLOCK DIAGRAM
VCC
VEE
AGND/DGND
RSN
VTX
RD
RDC
CAS
C1
C2
C3
E0
E1
DET
Two-Wire
Interface
HPA
HPB
DA
DB
BGND
VBAT
A(TIP)
B(RING)
TMG
Ground-Key
Detector
Signal
Transmission
Off-Hook
Detector
Power-Feed
Controller
Ring-Trip
Detector
RINGOUT
Ring Relay
Driver
Input Decoder
and Control


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