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參數(shù)資料
| 型號： | LUCL9313GP-DT |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications |
| 中文描述： | 線路接口和線路接入電路全功能SLIC和敲響訓(xùn)練班- 57應(yīng)用 |
| 文件頁數(shù)： | 27/40頁 |
| 文件大?。?/td> | 746K |
| 代理商： | LUCL9313GP-DT |
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Data Sheet
September 2001
Full-Feature SLIC and Ringing Relay for TR-57 Applications
L9313 Line Interface and Line Access Circuit
Agere Systems Inc.
27
Applications
(continued)
dc Characteristics
(continued)
dc Loop Current Limit
In the active modes, dc current limit is programmable
via an applied voltage source at the device’s V
PROG
control input. The voltage source may be an external
voltage source or derived via a resistor divider network
from the V
REF
SLIC output or an external voltage
source. A programmable external voltage source may
be used to provide software control of the loop current
limit. The loop current limit (I
LIM
) is related to the V
PROG
voltage by:
I
LIM
(mA) = 50 x V
PROG
(V)
Note that the overall current-limit accuracy achieved
will not only be affected by the specified accuracy of
the internal SLIC current-limit circuit (accuracy associ-
ated with the 50 term), but also by the accuracy of the
voltage source and the accuracy of any external resis-
tor divider network used and voltage offsets due to the
specified input bias current. If a resistor divider from
V
REF
is used, a lower magnitude resistor will give a
more accurate result due to a lower offset associated
with the input bias current; however, lower value resis-
tors will also draw more power from V
REF
. The sum of
the two resistors in the resistor divider should be
between 75 k
and 200 k
. Offset at V
PROG
and V
REF
accuracies are specified in Table 6.
The above equation describes the active mode steady-
state current-limit response. There will be a transient
response of the current-limit circuit (with the device in
the active mode) upon an on- to off-hook transition.
Typical active mode transient current-limit response is
given in Table 14.
Table 14. Typical Active Mode On- to Off-Hook Tip/
Ring Current-Limit Transient Response
The current limit with the SLIC set in an active mode
will be different from the current limit with the SLIC set
in the scan mode. This is due to differences in the scan
clamp circuit versus the active tip/ring drive amplifiers.
The scan mode current limit is fixed and is a function of
the internal design of the scan clamp circuit. The
steady-state scan mode current limit will be a typical
40 mA to 50 mA and may, over temperature and pro-
cess, vary typically from 30 mA to 110 mA. The scan
clamp current limit will typically settle to its steady-state
value within 300 ms.
Loop Range
The dc loop range is calculated using:
R
L
=
–
2R
P
–
R
dc
V
BAT1
is used because we are calculating the maximum
loop range. The loop resistance value where the device
automatically switches to V
BAT2
is calculated in the
Automatic Battery Switch section of this data sheet.
Battery Feed
The L9313 operates in a dc unbalanced mode. In the
forward active state, under open circuit (on-hook) con-
ditions, with the default overhead chosen, the tip to ring
voltage will be a nominal 5.5 V less than the battery.
This is the overhead voltage. The tip and ring overhead
is achieved by biasing ring a nominal 3.5 V above bat-
tery and by biasing tip a nominal 2.0 V below ground.
During off-hook conditions, some dc resistance will be
applied to the subscriber loop as a function of the phys-
ical loop length, protection, and telephone handset. As
the dc resistance decreases from infinity (on-hook) to
some finite value (off-hook), the tip to ring voltage will
decrease as shown in Figure 12.
12-3431a (F)
Figure 12. Tip/Ring Voltage
Parameter
Value
I
LIM
+ 60
Unit
mA
dc Loop Current:
Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 5 ms
dc Loop Current:
Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 50 ms
dc Loop Current:
Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 300 ms
I
LIM
+ 20
mA
I
LIM
mA
BAT
V
V
OH
–
I
LOOP
VTIP TO GND
(1/2)R
dc
BEGIN CURRENT LIMITING
(1/2)R
dc
(1/2)R
dc
+ R
LIM
DECREASING LOOP LENGTH
V
BAT
VRING TO GND
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