le79555 Zarlink Semiconductor, le79555 Datasheet - Page 15

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

100 kHz to 30 MHz
80% Amplitude
Modulated
1.5 Vrms
GEN
HF
V
Return loss = –20 log (2V
S
Z
eg., the characteristic impedance of the line
D
: The desired impedance;
50 Ω
R
R
300 Ω
300 Ω
Z
D
M
= 600 Ω
/ V
V
S
)
M
L
L
1
2
Z
Figure 7. Two-Wire Return Loss
IN
= 600 Ω
Zarlink Semiconductor Inc.
Figure 8. RFI
B (RING)
A (TIP)
15
200 Ω
200 Ω
SLIC
AGND
VTX
RSN
C
C
1
2
50 Ω
50 Ω
RF
RF
1
2
R
R
T1
T2
33 nF
33 nF
C
C
75 kΩ
75 kΩ
R
AX
BX
RX
= 150 k Ω
V
AB
C
A (TIP)
B (RING)
SLIC device
under test
T1
= 180 pF
VTX