le79r79 Zarlink Semiconductor, le79r79 Datasheet - Page 18

• Manufacturer Part Number: le79r79
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

V
S
Return loss = –20 log (2V
Z
eg., the characteristic impedance of the line
D
: The desired impedance;
R
R
R
L
= 600 Ω
Z
D
V
Figure 9. Two-Wire Return Loss Test Circuit
M
M
/ V
Figure 10. Loop-Detector Switching
S
)
Figure 11. Ground-Key Switching
Z
IN
Zarlink Semiconductor Inc.
A (TIP)
B (RING)
R
G
B (RING)
A (TIP)
18
V
CC
SLIC
A (TIP)
B (RING)
AGND
VTX
RSN
DET
6.2 k Ω
E1
R
R
T1
T2
15 pF
R
RX
C
T1