le79r70 Zarlink Semiconductor, le79r70 Datasheet - Page 15

• Manufacturer Part Number: le79r70
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

TEST CIRCUITS
L-T Long. Bal. = 20 log (V
L-4 Long. Bal. = 20 log (V
S2 Open, S1 Closed
B. Four- to Two-Wire Insertion Loss and Four- to Four-Wire Balance Return Signal
I
L4-2
ωC
= 20 log (V
1
S1
V
<< R
L
V
AB
AB
TX
L
C
AB
R
V
2
R
/ V
/ V
2
L
L
/ V
L
L
L
)
)
RX
V
A. Two- to Four-Wire Insertion Loss
L
)
R
R
2
2
R
L
L
C. Longitudinal Balance
L
I
V
Zarlink Semiconductor Inc.
L2-4
AB
V
= 20 log (V
AB
B(RING)
B(RING)
A(TIP)
4-L Long. Sig. Gen. = 20 log (V
A(TIP)
A(TIP)
B(RING)
15
SLIC
BRS = 20 log (V
SLIC
SLIC
TX
AGND
S2 Closed, S1 Open
AGND
/ V
AGND
RSN
VTX
RSN
RSN
VTX
VTX
AB
)
TX
/ V
RX
)
R
R
L
T
T
R
/ V
R
R
S2
T
RX
RX
RX
)
R
RX
V
RX
V
RX