le7920 Zarlink Semiconductor, le7920 Datasheet - Page 12

• Manufacturer Part Number: le7920
• Description: Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

DC FEED CHARACTERISTICS
Notes:
1.
2.
3.
V
V
V
AB
AB
AB
=
=
=
I
0.857
0.857
L
R
(volts)
L
VAB
'
(
(
=
V
V
1250
----------- -
R
BAT
BAT
DC
60
+
+
R
0
R
BAT = –48 V
3.3
1.2
L
'
DC
,
)
)
–
–
= R
where
I
I
L
L
DC1
R
---------- -
R
---------- -
300
300
DC
DC
R
+ R
3
L
'
DC2
=
R
L
= 54.34 kΩ
+
2
Zarlink Semiconductor Inc.
a. Load Line (Typical)
R
F
12
I
L
(mA)
2
1
30