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AM79R70 Scheda tecnica(PDF) 1 Page - Advanced Micro Devices

Il numero della parte AM79R70
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

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This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.
Publication# 21776
Rev: B Amendment: /0
Issue Date: July 1998
PRELIMINARY
Am79R70
Ringing Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s Ideal for ISDN-TA and set top applications
s On-chip ringing with on-chip ring-trip detector
s Low standby state power
s Battery operation:
—VBAT1: –40 V to –67 V
—VBAT2: –19 V to VBAT1
s On-chip battery switching and feed selection
s On-hook transmission
s Polarity reversal option
s Programmable constant-current feed
s Programmable Open Circuit voltage
s Programmable loop-detect threshold
s Current gain = 1000
s Two-wire impedance set by single component
s Ground-key detector
s Tip Open state for ground-start lines
s Internal VEE regulator
(no external –5 V power supply required)
s Two on-chip relay drivers and snubber circuits
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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