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AM79R70SC датащи(PDF) 1 Page - Advanced Micro Devices

номер детали AM79R70SC
подробное описание детали  Ringing Subscriber Line Interface Circuit
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
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Publication# 21776
Rev: D Amendment: /0
Issue Date: October 1999
Am79R70
Ringing Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
I Ideal for ISDN-TA and set top applications
I On-chip ringing with on-chip ring-trip detector
I Low standby state power
I Battery operation:
—VBAT1: –40 V to –67 V
—VBAT2: –19 V to VBAT1
I On-chip battery switching and feed selection
I On-hook transmission
I Polarity reversal option
I Programmable constant-current feed
I Programmable Open Circuit voltage
I Programmable loop-detect threshold
I Current gain = 1000
I Two-wire impedance set by single component
I Ground-key detector
I Tip Open state for ground-start lines
I Internal VEE regulator
(no external –5 V power supply required)
I 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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