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AM79574JC Datasheet(PDF) 14 Page - Advanced Micro Devices

Part # AM79574JC
Description  Subscriber Line Interface Circuit
PDF  17 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79574JC Datasheet(HTML) 14 Page - Advanced Micro Devices

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14
Am79574 Data Sheet
TEST CIRCUITS
VTX
RSN
AGND
RT
RRX
VL
VAB
VAB
RL
RSN
AGND
VTX
VRX
RRX
IL2-4 = –20 log (VTX / VAB)
A. Two- to Four-Wire Insertion Loss
IL4-2 = –20 log (VAB / VRX)
B. Four- to Two-Wire Insertion Loss and Balance Return Signal
VTX
RSN
AGND
RT
RRX
VRX
S2 Open, S1 Closed:
L-T Long. Bal. = 20 log (VAB / VL)
L-4 Long. Bal. = 20 log (VTX / VL)
BRS = 20 log (VTX / VRX)
SLIC
SLIC
SLIC
SLIC
RL
2
B(RING)
A(TIP)
B(RING)
A(TIP)
VL
S1
B(RING)
A(TIP)
S2
1/
ωC << R
L
C
S2 Closed, S1 Open:
4-L Long. Sig. Gen. = 20 log (VL /VRX)
C. Longitudinal Balance
R
R
VM
ZIN
900
Ω
VS
RT
RRX
B(RING)
A(TIP)
RSN
AGND
VTX
D. Two-Wire Return Loss Test Circuit
Note:
ZD is the desired impedance (e.g., the
characteristic impedance of the line).
RL = –20 log (2 VM / VS)
RT
IDC
RL
2
VL
RL
2
RL
2



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