le79r70 Zarlink Semiconductor, le79r70 Datasheet - Page 13

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

DC FEED CHARACTERISTICS
Notes:
1. Constant-current region:
2. Low battery
3.
4. High battery
5.
(
R
V
DC
BAT1
Anti-sat region:
Anti-sat region:
=
=
R
–
DC1
67 V V
(Volts)
V
AB
+
R
,
DC2
50
40
30
20
10
BAT2
0
=
5) V
20 kΩ
3) V
=
APPH
–
APPL
24 V
V
V
V
V
V
V
V
V
+
I
I
LOOPL
LOOPH
AB
ASL
ASL
APPL
ASH
ASHH
ASHH
APPH
80 kΩ
)
=
=
=
=
Figure 1. Typical V
=
=
I
=
=
L
=
=
=
1000
------------------------------------------------------------------ - ;
1000
-------------------------------------------------------------- - ;
6720 10
V
6720
R
4.17
4.17
---------------------------------------------------------------------- - ;
1934 10
---------------------------------------------------------------------- - ;
1934 10
ASHH
100 kΩ
------------------------------------------------------------------------------ -
(
------------------------------------- -
1000
------------------------------------------------------------------------------ -
(
--------------------------------------
L
R
1000
R
DC1
DC1
•
•
•
=
+
+
•
(
(
•
•
------------ - R
RDC
•
2500
V
104 • 10
10
R
+
V
600
600
•
+
(
+
3
ASL
SGL
V
ASH
(
R
3
+
R
70 10
3
3
R
ASL
Zarlink Semiconductor Inc.
SGH
+
+
+
DC2
(
DC2
I
(
80 R
L
–
•
L
V
(
(
V
80 R
31.75 R
31.75 R
(mA)
;
56 10
APPL
+
APPH
AB
3
)
•
)
•
+
where
+
3
2.75 10
+
•
+
vs. I
High Battery Anti-Sat
R
SGL
2R
Low Battery Anti-Sat
2R
SGL
•
•
SGL
R
13
3
F
•
SGH
F
L
)
)
+
SGH
SGH
+
)
DC Feed Characteristics
R
)
R
R
L
3
)
LOOP
)
=
LOOP
where R
)
)
R
where R
R
SGL
L
where R
where R
R
+
to V
SGH
2R
SGL
SGL
F
CC
to V
= resistor to V
SGH
SGH
must be greater than 100 kΩ.
= resistor to GND, B2EN = logic Low.
CC
4) V
1) Constant-Current Region
2) V
= resistor to GND, B2EN = logic High.
= resistor to V
must be greater than 100 kΩ.
ASH
ASL
30
CC
, B2EN = logic Low.
CC
, B2EN = logic High.