le57d111 Zarlink Semiconductor, le57d111 Datasheet - Page 13

• Manufacturer Part Number: le57d111
• Description: Dual Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

GEN
HF
V
Return loss = –20 log (2V
S
Z
eg., the characteristic impedance of the line
D
: The desired impedance;
L-4 Long. Bal. = 20 log(3V
L-T Long. Bal. = 20 log(V
50 Ω
S2 Open, S1 Closed
R
R
80% amplitude modulated
Modulation frequency = 1 kHz
ωC
1
S1
V
<<
L
R
C
Z
L
D
M
= 600 Ω
/ V
L
Figure 5. Two-Wire Return Loss Test Circuit
L
1
V
V
AB
S
2
TX
)
L
M
R
R
2
/ V
2
/ V
L
L
L
L
Figure 4. Longitudinal Balance
)
)
Z
IN
Figure 6. RFI Test Circuit
= 600 Ω
V
Zarlink Semiconductor Inc.
AB
B
A
4-L Long. Sig. Gen. = 20 log(V
200Ω
200Ω
1
1
, B
, A
A
B
1
1
13
2
, A
, B
2
(RING)
(TIP)
2
2
SLIC
(TIP)
(RING)
S2 Closed, S1Open
SLIC
AGND
RSN
RSN
C
C
VTX
VTX
AGND
1
2
RSN
RSN
VTX
VTX
1
2
1
2
1
2
1
2
50Ω
50Ω
RF
RF
1
2
L
/ V
R
RX
R
TA
TB
)
C
C
S2
R
AX
BX
T
R
R
R
2
2
T
T
RX
R
= 124 K
RX
A
B
C
1
1
under test
, A
, B
T
SLIC
= 120 pF
2
2
(RING)
(TIP)
V
RX
VTX
VTX
1
2