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參數(shù)資料
| 型號(hào)： | L7554 |
| 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)： | 22/28頁 |
| 文件大?。?/td> | 476K |
| 代理商： | L7554 |
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22
Lucent Technologies Inc.
Data Sheet
March 1997
L7554 Low-Power SLIC
Applications
(continued)
dc Applications
(continued)
Adjusting dc Feed Resistance
The dc feed resistance may be adjusted with the help of
Figure 28.
12-2560 (C)
Figure 28. Equivalent Circuit for Adjusting the dc
Feed Resistance
Adjusting Overhead Voltage and dc Feed
Resistance Simultaneously
The following 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 29.
12-2561 (C)
Figure 29. 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 adjustments can be made by the simple superposi-
tion 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 fil-
ter. This applies in both powerup and low-power scan
states. The loop-closure detection threshold is set by
resistor R
LCTH
. Referring to Figure 30, 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 x R
LCTH
+ V
DCOUT
= 0.05 x R
LCTH
– 0.125 V/mA x I
TR
R
LCTH
(k
) = 2.5 x I
TR
(mA)
12-2553.a (C)
Figure 30. Off-Hook Detection Circuit
DCR
25 k
±
30%
R1
R3
DCOUT
Rdc
113
500
V
DCOUT
--------------------
+
=
113
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
||
---------------------------------------------
+
=
Rdc
113
500
||
R
3
R
1
25 k
+
||
-----------------------------------
+
=
R
L
----------------------------
I
L
2R
P
–
Rdc
–
=
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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