LUCL9313AP-D AGERE [Agere Systems], LUCL9313AP-D Datasheet - Page 28

• Manufacturer Part Number: LUCL9313AP-D
• Description: Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

Full-Feature SLIC and Ringing Relay for TR-57 Applications
Applications
dc Characteristics
Battery Feed (continued)
As illustrated in Figure 12, as loop length decreases,
the tip to ground voltage will decrease with a slope cor-
responding to one-half the internal dc feed resistance
of the SLIC (typical 75 ). The ring to ground voltage
will also decrease with a slope corresponding to one-
half the internal dc feed resistance of the SLIC, until the
SLIC reaches the current-limit region of operation. At
that point, the slope of the ring to ground voltage will
increase to the sum of one half the internal dc feed
resistance plus approximately 10 k .
The dc feed characteristic can be described by:
I
V
where:
I
V
V
R
resistance.
R
R
Notes:
V
V
I
28
LIM
LOOP
LOOP
BAT1
BAT2
V
T/R
T/R
OH
LOOP
P
dc
Figure 13. L9313 Loop Current vs. Loop Voltage
BAT
= protection resistance.
= 40 mA (R
= SLIC internal dc feed resistance.
= overhead voltage.
=
= dc loop voltage.
= –48 V.
= –24 V.
50
40
30
20
10
= dc loop current.
=
0
= loop resistance, including wire and handset
--------------------------------------------------------------- -
0
------------------------------------------------------
R
= battery voltage magnitude.
V
R
LOOP
BAT
LOOP
V
5
PROG
BAT
–
+
V
+
2R
10
= 66.5 k ).
–
OH
2R
(continued)
V
P
OH
P
+
15
+
LOOP VOLTAGE (V)
R
R
(continued)
R
LOOP
dc
dc
20
10 k
1
25
30
35
40
12-3050.g (F)
R
1
dc
45
Refer to Figure 12 and Figure 13 in this section and to Fig-
ure 11 in the Automatic Battery Switch section.
Starting from the on-hook condition and going through
to a short circuit, the curve passes through two regions:
Region 1: on-hook and low loop currents: the slope cor-
responds to the dc feed resistance of the SLIC (plus
any series resistance). The open-circuit voltage is the
battery voltage less the overhead voltage of the device.
Region 2: current limit: the dc current is limited to a
value determined by V
plate has a high resistance (10 k ).
Notice that the I-V curve is uninterrupted when the
power is shifted from the high-voltage battery to the
low-voltage battery (if auxiliary battery option is used).
This is shown in Figure 11 in the Automatic Battery
Switch section.
Battery Reversal Rate
The rate of battery reverse is controlled or ramped by
capacitors FB1 and FB2. A chart showing FB1/FB2 val-
ues versus typical ramp time is given below. Leave
FB1 and FB2 open if it is not desired to ramp the rate of
battery reversal.
Table 15. FB1/FB2 Values vs. Typical
* Typical recommended value for C
Longitudinal to Metallic Balance
Longitudinal to metallic balance at PT/PR is specified in
the Electrical Characteristics section of this data sheet.
than 0.033 F.
C
0.01 F
0.22 F
0.47 F
1.22 F
FB1
0.1 F
1.0 F
1.3 F
1.4 F
1.6 F
Ramp Time
/C
FB2
*
PROG
. This region of the dc tem-
Transition Time
FB1
220 ms
440 ms
900 ms
and C
20 ms
2.25 s
1.8 s
2.5 s
2.7 s
3.2 s
September 2001
Agere Systems Inc.
FB2
is less