le57d111 Zarlink Semiconductor, le57d111 Datasheet - Page 11

• Manufacturer Part Number: le57d111
• Description: Dual Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

DC Feed Characteristics
Regions:
1.
2a. Battery-independent anti-sat (Off-hook):
2b. Battery-independent anti-sat (On-hook):
3a. Battery tracking anti-sat (Off-hook):
3b. Battery tracking anti-sat (On-hook):
Constant current region:
Switch-hook Threshold:
2b
On-Hook
3b
Vbat = -42V
Vbat = -48V
3a
I
2a
SWTH
V
V
V
V
Zarlink Semiconductor Inc.
AB2a
V
AB1
Load Line (Typical)
AB2b
AB3a
AB3b
=
=
=
------------- -
R
=
=
150
=
I
REF
43.6 V I
L
V
R
V
11
V
AB2a
L
BAT
Vbat = -38V
Off-Hook
AB3a
'
=
(
-------------- R
R
–
–
–
450
REF
–
3.5 V
1.8 V I
L
303 Ω
0.33 V
)
L
–
⋅
'
L
,
111 Ω
BAT
where R
+
10.8
R
REF
L
'
=
=
1
R
15 k
L
+
2R
F