le79555 Zarlink Semiconductor, le79555 Datasheet - Page 14

• Manufacturer Part Number: le79555
• Description: Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

TEST CIRCUIT SCENARIOS
L-T Long. Bal. = 20 log(V
L-4 Long. Bal. = 20 log(V
S2 Open, S1 Closed
V
AB
Figure 5. Four-to-Two-Wire Insertion Loss and Balance Return Signal
ωC
R
V
R
1
2
2
L
L
L
S1
<<
R
R
C
L
L
Figure 4. Two-to-Four-Wire Insertion Loss
V
V
AB
TX
L
AB
R
R
2
/ V
/ V
2
L
L
L
L
Figure 6. Longitudinal Balance
)
)
BRS = 20 log(V
I
A (TIP)
B (RING)
L4-2
A (TIP)
B (RING)
I
L2-4
V
= 20 log(V
Zarlink Semiconductor Inc.
AB
= 20 log(V
SLIC
SLIC
4-L Long. Sig. Gen. = 20 log(V
B (RING)
A (TIP)
AGND
AB
TX
14
VTX
AGND
TX
R
/ V
/ V
VTX
RSN
SN
/ V
SLIC
RX
RX
S2 Closed, S1Open
AB
)
)
)
AGND
VTX
R
SN
R
L
T
R
/ V
R
RX
T
R
RX
RX
)
S2
R
T
V
R
RX
RX
V
RX