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參數(shù)資料
| 型號： | L8576B |
| 英文描述： | Dual Ringing SLIC |
| 中文描述： | 雙振鈴用戶接口 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大小： | 583K |
| 代理商： | L8576B |
Agere Systems Inc.
11
Data Sheet
May 2001
L8576B Dual Ringing SLIC
Electrical Characteristics
(continued)
Pretrip will not occur for the circuits shown below, per GR-909, 4.5.9.
12-2572(F).d
Figure 4. Pretrip Circuit
Table 5. Battery Feed
1. Assumes 2 x 30
external protection resistors. Note the useful range of the device may be determined by the ringing or supervision range
rather than the ac characteristics.
2. The longitudinal current is independent of dc loop current.
3. Current limit I
LIM
is programmed by a resistor, R
PROG
, from pin I
PROG
to pin DC
OUT
R
PROG
(k
)
= 3.5 x (I
LIM
– 9.2) mA. The current limit has a
slope vs. loop voltage of 6 k
. To control power dissipation, it is recommended that the default current limits be utilized, i.e., R
PROG
= 51.1 k
for 24 mA nominal loop current limit.
4. Instantaneous current limit minimizes inrush current at the onset of an off-hook condition. Inrush current is only limited when in the forward
battery state. The device will settle into a dc loop current-limit value within 400 ms after off-hook.
5.
IEEE
is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
6. Assumes the external protection resistors are matched to 1%.
7. This parameter is not tested during production. It is guaranteed by design and device characterization.
Parameter
Min
Typ
Max
Unit
Loop Resistance Range
1
(3.17 dBm overload into 600
):
I
LOOP
= 20 mA at V
BAT
= –65 V
Longitudinal Current Capability per Wire
2
Current Limit
3
R
LOOP
= 100
:
dc Loop
Instantaneous
4
Tip or Ring Drive Current = dc + Longitudinal + Signal Currents
Signal Current
Powerup Open Loop Voltage Level
Differential Voltage (RNGNG = 0, NDISC = 1, B2 = 1,
V
BAT
= –65 V)
Disconnect State:
PT or PR Current (V
BAT
< V
PT
< 0 V)
PT or PR Resistance (V
BAT
< V
PT
< 0 V)
dc Feed Resistance
Longitudinal to Metallic Balance—
IEEE
5
Standard 455
6
:
200 Hz to 1 kHz
1 kHz to 3 kHz
Metallic to Longitudinal (Harm) Balance
7
:
200 Hz to 4 kHz
1000
8.5
—
15
—
—
mArms
20
50
65
5
24
60
—
—
—
28
70
—
—
—
mA
mA
mA
mArms
V
|V
BAT
+ 10|
–1
100
—
—
—
60
1
—
70
mA
k
54
48
67
62
—
—
dB
dB
35
—
—
dB
RING
RING
10 k
6
μ
F
TIP
TIP
200
SWITCH CLOSES FOR LESS THAN 12 ms
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