am79r70 Advanced Micro Devices, am79r70 Datasheet - Page 12

• Manufacturer Part Number: am79r70
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

DC FEED CHARACTERISTICS
12
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
3) V
20 k
=
APPH
APPL
–
24 V
+
V
V
V
V
V
V
V
V
I
I
Figure 1. Typical V
LOOPL
LOOPH
80 k
AB
ASL
ASL
APPL
ASH
ASHH
ASHH
APPH
=
=
=
=
=
=
I
=
=
=
L
=
=
1000
------------------------------------------------------------------ - ;
1000
-------------------------------------------------------------- - ;
6720 10
V
6720
R
4.17
4.17
---------------------------------------------------------------------- - ;
1934 10
---------------------------------------------------------------------- - ;
1934 10
100 k
ASHH
------------------------------------------------------------------------------ -
------------------------------------- -
1000
------------------------------------------------------------------------------ -
--------------------------------------
L
R
1000
R
DC1
DC1
=
+
+
------------ - R
RDC
2500
V
104
10
R
+
V
600
600
P R E L I M I N A R Y
+
3
+
ASL
SGL
ASH
V
R
3
Am79R70 Data Sheet
+
R
70 10
3
3
R
ASL
I
SGH
+
L
+
+
DC2
DC2
80 R
(m A)
–
10
L
V
V
AB
80 R
31.75 R
31.75 R
;
56 10
APPL
+
APPH
3
High Battery Anti-Sat
where
+
+
3
2.75 10
+
Low Battery Anti-Sat
vs. I
+
R
SGL
2R
2R
SGL
SGL
R
3
F
SGH
F
L
+
SGH
SGH
+
R
DC Feed Characteristics
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 k .
4) V
1) Constant-Current Region
2) V
= resistor to GND, B2EN = logic Low.
CC
= resistor to GND, B2EN = logic High.
= resistor to V
ASH
ASL
must be greater than 100 k .
30
CC
, B2EN = logic Low.
CC
, B2EN = logic High.