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參數(shù)資料
| 型號(hào)： | L7556 |
| 廠商： | Lineage Power |
| 英文描述： | Low-Power SLICs （electronic subscriber loop interface circuits ）with Battery Switch(帶電池開(kāi)關(guān)的低功耗用戶環(huán)路接口電路（SLIC）) |
| 中文描述： | 低功耗SLIC組件（電子用戶環(huán)路接口電路）與電池開(kāi)關(guān)（帶電池開(kāi)關(guān)的低功耗用戶環(huán)路接口電路電路（SLIC）） |
| 文件頁(yè)數(shù)： | 22/28頁(yè) |
| 文件大?。?/td> | 753K |
| 代理商： | L7556 |
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22
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Applications
(continued)
dc Applications
(continued)
Adjusting dc Feed Resistance
The dc feed resistance may be adjusted with the help
of Figure 28.
12-2560 (F)
Figure 28. Equivalent Circuit for Adjusting the dc
Feed Resistance
The above paragraphs describe the independent set-
ting of the overhead voltage and the dc feed resis-
tance. 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 a 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
filter. 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 mA x R
LCTH
– 0.125 V/mA x I
TR
R
LTCH
(k
) = 2.5 x I
TR
(mA)
12-2553g(F)
Figure 30. Off-Hook Detection Circuit Applications
DCR
R1
R3
DCOUT
25 k
± 30%
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
7.9
20
+
R
1
25 k
||
||
R
2
R
3
---------------------------------------------
+
=
R
DC
115
500
||
R
2
R
1
25k
+
||
-------------------------------------
+
=
R
L
----------------------------
I
L
2R
P
–
R
dc
–
=
R
L
ITR
R
P
R
P
RING
–
+
DCOUT
R
LCTH
LCTH
NLC
TIP
0.125 V/mA
0.05 mA
–
+
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