le5712 Zarlink Semiconductor, le5712 Datasheet - Page 14

• Manufacturer Part Number: le5712
• Description: Dual Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

DC Feed Characteristics
Regions:
1.
In Active and Reverse Polarity states
2. Battery tracking anti-sat (Off-hook):
3. Battery tracking anti-sat (On-hook):
In Active Metering and Reverse Polarity Metering states
4. Battery tracking anti-sat (Off-hook):
5. Battery tracking anti-sat (On-hook):
Constant current region:
50
45
40
35
30
25
15
10
20
5
0
0
BAT = -48 V
BAT = -52 V
BAT = -46.5 V
RL = 2125 ohm
On-Hook
5
V
AB3
10
Load Line (Active) (Typical)
Zarlink Semiconductor Inc.
Loop Current (mA)
15
V
V
AB1
V
V
V
AB2
AB3
AB3
AB2
14
=
=
=
=
=
I
LOOP
BAT
BAT
BAT
BAT
20
R
Off-Hook
L
–
–
–
–
=
10.7 V
10.7 V
7 V
7 V
------------- -R
R
470
REF
+
+
10 kΩ V
-------------------------- - I
47 kΩ V
-------------------------- - I
+
+
25
R
47 kΩ V
-------------------------- - I
R
⋅
10 kΩ V
-------------------------- - I
L
⋅
,
REF
REF
R
where R
R
⋅
⋅
REF
REF
V
⋅
⋅
AB2
⋅
⋅
–
,
–
L
–
L
–
L
⋅
⋅
30
=
L
160 Ω
L
160 Ω
V
⋅
⋅
R
160 Ω
160 Ω
AB1
L
'
+
2R
F
071902
35