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參數(shù)資料
| 型號： | LUCL9218GAR-DT |
| 英文描述： | CAT5E PATCH CABLES SNAGLESS,BLUE 100 FT |
| 中文描述： | 低成本線接口 |
| 文件頁數(shù)： | 19/30頁 |
| 文件大?。?/td> | 378K |
| 代理商： | LUCL9218GAR-DT |
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Agere Systems Inc.
19
Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
Applications
(continued)
dc Applications
Battery Feed
The dc feed characteristic can be described by:
where:
I
L
= dc loop current.
V
T/R
= dc loop voltage.
|
V
BAT
|
= battery voltage magnitude.
V
OH
= overhead voltage. This is the difference between
the battery voltage and the open loop tip/ring
voltage.
R
L
= loop resistance, not including protection resistors.
R
P
= protection resistor value.
R
dc
= SLIC internal dc feed resistance.
The design begins by drawing the desired dc template.
An example is shown in Figure 13.
Notes:
V
BAT
= –48 V.
I
LIM
= 22 mA.
R
dc1
= 115
.
Figure 13. Loop Current vs. Loop Voltage
Starting from the on-hook condition and going through
to a short circuit, the curve passes through the follow-
ing two regions:
Region 1: On-hook and low-loop currents. The slope
corresponds to the dc resistance of the
SLIC, R
dc1
(70
typical). The open circuit
voltage is the battery voltage minus the over-
head voltage of the device, V
OH
(6.5 V typi-
cal). These values are suitable for most
applications but can be adjusted if needed.
Region 2: Current limit. The dc current is limited to a
starting value determined by external resis-
tor R
PROG
, an internal current source, and
the gain from tip/ring to pin DCOUT.
Current Limit
With the B0/B1 logic inputs set to 11 (low current limit),
current limit with a 100
load is given by the following
equation:
0.637 R
PROG
(k
) + 2 mA= I
LIM
x (mA)
The relationship between low current limit (B0 = 1,
B1 = 1) and high current limit (B0 = 1, B1 = 0) is
LIMIT
Low
(
)
I
LIMIT
High
(
)
= 0.7
Overhead Voltage
In order to drive an on-hook ac signal, the SLIC must
set up the tip and ring voltage to a value less than the
battery voltage. The amount that the open loop voltage
is decreased relative to the battery is referred to as the
overhead voltage, expressed as the following equation:
V
OH
= |V
BAT
| – (V
PT
– V
PR
)
Without this buffer voltage, amplifier saturation will
occur and the signal will be clipped. The L9218 is auto-
matically set at the factory to allow undistorted on-hook
transmission of a 3.14 dBm signal into a 900
loop
impedance.
I
L
R
L
+
R
dc
+
2R
P
---------------------------------
=
V
T/R
R
L
2R
P
---------------------------------------------
R
dc
L
+
+
=
0
10
20
50
0
20
30
40
50
LOOP VOLTAGE (V)
30
40
10
L
1
12.5 k
–1
R
dc1
I
LIM
TESTED
I
LIM
ONSET
12-3050 (F).i
I
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