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AM79574JC Scheda tecnica(PDF) 1 Page - Advanced Micro Devices

Il numero della parte AM79574JC
Spiegazioni elettronici  Subscriber Line Interface Circuit
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Produttore elettronici  AMD [Advanced Micro Devices]
Homepage  http://www.amd.com
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AM79574JC Scheda tecnica(HTML) 1 Page - Advanced Micro Devices

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Publication# 16855
Rev: E Amendment: /0
Issue Date: October 1999
Am79574
Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
s Programmable constant resistance feed
s Line-feed characteristics independent of
battery variations
s Programmable loop-detect threshold
s On-chip switching regulator for low-power
dissipation
s Pin for external ground-key noise filter
capacitor available
s Ground-key detect option available
s Two-wire impedance set by single external
impedance
s Polarity reversal feature
s Tip Open state for ground-start lines
s Test relay driver optional
s On-hook transmission
BLOCK DIAGRAM
VTX
RD
RDC
C1
C2
C3
C4
E1
E0
Input Decoder
and Control
Two-Wire
Interface
Switching
Regulator
Test Relay Driver
Ring Relay Driver
RINGOUT
TESTOUT
GKFIL
A(TIP)
HPA
HPB
DA
DB
L
BGND
CHS
CHCLK
AGND
16855C-001
Signal
Transmission
Power-Feed
Controller
Off-Hook
Detector
Ground-Key
Detector
Ring-Trip Detector
DET
Notes:
1. Am79574—E0 and E1 inputs; ring and test relay drivers sourced internally to BGND.
2. Output amplifier current gain (K1) = 1000.
RSN
B(RING)
VREG
VBAT
QBAT
VCC
VEE


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