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參數(shù)資料
| 型號： | LUCL9217GAR-D |
| 英文描述： | Aluminum Snap-In Capacitor; Capacitance: 10000uF; Voltage: 25V; Case Size: 25x30 mm; Packaging: Bulk |
| 中文描述： | 低成本線接口，具有反向電池和PPM |
| 文件頁數(shù)： | 19/30頁 |
| 文件大?。?/td> | 414K |
| 代理商： | LUCL9217GAR-D |
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Agere Systems Inc.
19
Data Sheet
November 2001
with Reverse Battery and PPM
L9217A/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.
Note: 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
(default is 72
typical). The open circuit voltage is
the battery voltage minus the overhead voltage of the
device, V
OH
(default is 6.5 V typical). 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 resistor R
PROG
,
an internal current source, and the gain from tip/ring to
pin VITR. Current limit with a 100
load is set by the
following equation:
0.637 R
PROG
(k
) + 2 mA = I
LIM
x (mA)
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. This is 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. In modes without
PPM, the L9217 is set to allow undistorted on-hook
transmission of a 3.17 dBm signal into a 900
loop
impedance. A minimum 11.1 V overhead is needed to
pass 3.5 Vrms meter pulse.
In high overhead and PPM modes, overhead is auto-
matically increased to accommodate on-hook trans-
mission of meter pulse signals. The increase in
overhead is set by a resistor from pin OVH to ground.
This is expressed as the following equation:
V
OVH
(V) = 6.37 + 0.09535 x R
OVH
(k
)
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LUCL9217GAR-DT | Low-Cost Line Interface with Reverse Battery and PPM |
| LUCL9218AAR-D | Low-Cost Line Interface |
| LUCL9218AAR-DT | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:3; Connector Shell Size:16; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight |
| LUCL9218GAR-D | CAT5E PATCH CABLES SNAGLESS,BLUE 50 FT |
| LUCL9218GAR-DT | CAT5E PATCH CABLES SNAGLESS,BLUE 100 FT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LUCL9217GAR-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and PPM |
| LUCL9218AAR-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| LUCL9218AAR-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| LUCL9218GAR-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| LUCL9218GAR-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
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