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AM79R70 数据表(PDF) 12 Page - Advanced Micro Devices

部件名 AM79R70
功能描述  Ringing Subscriber Line Interface Circuit
PDF  17 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79R70 数据表(HTML) 12 Page - Advanced Micro Devices

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P R E L I M I N A R Y
12
Am79R70 Data Sheet
DC FEED CHARACTERISTICS
IL (mA)
0
30
50
VAB
(Volts)
2) VASL
3) VAPPL
40
30
20
10
5) VAPPH
4) VASH
Figure 1. Typical VAB vs. IL DC Feed Characteristics
Notes:
1. Constant-current region:
where
2. Low battery
where RSGL = resistor to GND, B2EN = logic Low.
Anti-sat region:
where RSGL = resistor to VCC, B2EN = logic Low.
RSGL to VCC must be greater than 100 kΩ.
3.
4. High battery
Anti-sat region:
where RSGH = resistor to GND, B2EN = logic High.
where RSGH = resistor to VCC, B2EN = logic High.
RSGH to VCC must be greater than 100 kΩ.
5.
R
DC
R
DC1
R
DC 2
20 k
Ω 80 kΩ 100 kΩ
=
+
=
+
=
V
BAT1
67 V V
BAT2
24 V
–
=
,
–
=
()
V
AB
I
LRL
2500
RDC
-------------R
L;
=
=
R
L
R
=
L
2R
F
+
V
ASL
1000
104
• 10
3
R
SGL
+
()
•
6720
10
•
3
80
R
SGL
•
()
+
------------------------------------------------------------------- ;
=
V
ASL
1000
R
SGL
56
10
3
•
–
()
•
6720
10
3
•
80
R
SGL
•
()
+
--------------------------------------------------------------- ;
=
V
APPL
4.17
V
ASL
+
=
I
LOOPL
V
APPL
R
DC1
R
DC 2
+
()
600
--------------------------------------
2R
F
R
LOOP
++
-------------------------------------------------------------------------------
=
V
ASH
V
ASHH
V
ASL
+
=
V
ASHH
1000
70
10
3
•
R
SGH
+
()
•
1934
10
3
•
31.75
R
SGH
•
()
+
----------------------------------------------------------------------- ;
=
V
ASHH
1000
R
SGH
2.75
10
3
•
+
()
•
1934
10
3
•
31.75
R
SGH
•
()
+
----------------------------------------------------------------------- ;
=
V
APPH
4.17
V
ASH
+
=
I
LOOPH
V
APPH
R
DC 1
R
DC2
+
()
600
--------------------------------------
2R
F
R
LOOP
++
-------------------------------------------------------------------------------
=
High Battery Anti-Sat
LowBattery Anti-Sat
1) Constant-Current Region



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