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參數(shù)資料
| 型號： | L8551 |
| 廠商： | Lineage Power |
| 英文描述： | Low-Power SLIC(低功耗用戶線接口（SLIC）) |
| 中文描述： | 低功耗用戶接口（低功耗用戶線接口電路（SLIC）） |
| 文件頁數(shù)： | 22/32頁 |
| 文件大?。?/td> | 526K |
| 代理商： | L8551 |
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22
Lucent Technologies Inc.
Data Sheet
March 1997
L8551 Low-Power SLIC
Applications
(continued)
dc Applications
(continued)
Adjusting dc Feed Resistance
The dc feed resistance may be adjusted with the help of
Figure 29.
12-2563 (C).d
Figure 29. Equivalent Circuit for Adjusting the dc
Feed Resistance
Adjusting Overhead Voltage and dc Feed
Resistance Simultaneously
The above paragraphs describe the independent set-
ting of the overhead voltage and the dc feed resistance.
If both need to be set to customized values, combine
the two circuits as shown in Figure 30.
12-2561 (C)
Figure 30. Adjusting Both Overhead Voltage and dc
Feed Resistance
This is an equivalent circuit for adjusting both the dc
feed resistance and overhead voltage together. The ad-
justments can be made by simple superposition of the
overhead and dc feed equations:
When selecting external components, select R1 on the
order of 5 k
to minimize the programming inaccuracy
caused by the internal 25 k
resistor. Lower values can
be used; the only disadvantage is the power consump-
tion of the external resistors.
Loop Range
The equation below can be rearranged to provide the
loop range for a required loop current:
Off-Hook Detection
The loop closure comparator has built-in longitudinal
rejection, eliminating the need for an external 60 Hz
filter. The loop closure detection threshold is set by
resistor R
LCTH
. Referring to Figure 31, NLC is high in
an on-hook condition (I
TR
= 0, V
DCOUT
= 0), and
V
LCTH
= 0.05 mA x
R
LCTH
. The off-hook comparator
goes low when V
LCTH
crosses zero and then goes neg-
ative:
V
LCTH
0.05 mA
R
LCTH
×
=
12-2553a (C)
Figure 31. Off-Hook Detection Circuit
DCR
25 k
±
30%
R1
R3
DCOUT
R
DC
115
500
V
DCOUT
--------------------
+
=
115
500
||
R
3
R
1
25 k
+
||
---------------------------------
+
=
DCR
25 k
±
30%
R1
R3
DCOUT
R2
–5 V
V
OH
6.5
20
||
R
2
R
1
25 k
R
3
||
+
||
---------------------------------------------
+
=
R
DC
110
500
||
R
1
25 k
||
+
R
3
-----------------------------------
+
=
R
L
----------------------------
I
L
2R
P
–
R
DC
–
=
V
DCOUT
+
0.05
R
LCTH
×
0.125 V
/
mA
–
I
TR
×
=
R
LTCH
k
(
)
2.5
I
TR
mA
(
)
×
=
R
L
ITR
R
P
R
P
PR
–
+
–
+
DCOUT
R
LCTH
LCTH
NLC
PT
–0.125 V/mA
0.05 mA
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