le79r79 Zarlink Semiconductor, le79r79 Datasheet - Page 15

• Manufacturer Part Number: le79r79
• 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
–
75 V V
+
(Volts)
V
R
AB
DC2
,
BAT2
=
50
40
30
20
10
20 kΩ
0
=
5) V
–
3) V
24 V
+
V
V
V
V
I
V
V
V
V
I
APPH
APPL
LOOPL
LOOPH
80 kΩ
AB
ASL
ASL
APPL
ASH
ASHH
ASHH
APPH
)
Figure 3. Typical V
=
=
=
=
=
I
=
=
=
=
=
L
=
1000
----------------------------------------------------------------- - ;
1000
-------------------------------------------------------------- - ;
6720 10
V
6720 10
R
4.17
4.17
---------------------------------------------------------------------- - ;
1934 10
---------------------------------------------------------------------- - ;
1934 10
------------------------------------------------------------------------------ -
(
--------------------------------------
ASHH
------------------------------------------------------------------------------ -
100 kΩ
(
--------------------------------------
1000
L
R
R
1000
DC1
DC1
=
•
•
•
•
+
+
(
•
•
(
------------ - R
RDC
•
2500
V
600
600
104 10
R
+
V
•
+
+
(
3
ASL
SGL
ASH
V
3
(
R
R
+
R
70 10
3
3
+
ASL
Zarlink Semiconductor Inc.
SGH
•
DC2
+
+
DC2
(
(
80 R
–
V
•
V
80 R
L
(
(
31.75 R
31.75 R
;
56 10
APPL
APPH
3
)
+
)
AB
•
I
•
L
+
+
+
where
3
2.75 10
•
(mA)
R
2R
+
2R
vs. I
SGL
SGL
SGL
•
•
R
F
15
3
F
•
SGH
High Battery Anti-Sat
Low Battery Anti-Sat
)
)
+
+
L
)
SGH
SGH
)
R
R
R
DC Feed Characteristics
3
)
L
LOOP
LOOP
)
where R
)
)
=
R
where R
SGL
R
L
where R
where R
R
+
to V
SGH
2R
SGL
SGL
CC
F
to V
,
= resistor to V
SGH
SGH
must be greater than 100 kΩ.
= resistor to GND, B2EN = logic Low.
CC
= resistor to GND, B2EN = logic High.
= resistor to V
must be greater than 100 kΩ.
4) V
1) Constant-Current Region
2) V
ASH
ASL
CC
30
, B2EN = logic Low.
CC
, B2EN = logic High.