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參數(shù)資料
| 型號： | L8551 |
| 廠商： | Lineage Power |
| 英文描述： | Low-Power SLIC(低功耗用戶線接口（SLIC）) |
| 中文描述： | 低功耗用戶接口（低功耗用戶線接口電路（SLIC）） |
| 文件頁數(shù)： | 16/32頁 |
| 文件大小： | 526K |
| 代理商： | L8551 |
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16
Lucent Technologies Inc.
Data Sheet
March 1997
L8551 Low-Power SLIC
Applications
(continued)
Table 11. Parts List for Ground Start Applications
Design Considerations
Table 12 shows the design parameters of the application circuit shown in Figure 12. Components that are adjusted
to program these values are also shown.
Table 12. 600
Design Parameters
Name
Value
Function
Supervision
R
LCTH
R
TS1
R
TS2
24.9 k
, 1%, 1/8 W
402
, 5%, 2 W
274 k
, 5%, 1/8 W
Sets loop closure (off-hook) threshold.
Ringing source series resistor.
With C
RTS2
, forms first pole of a double pole,
2 Hz ring trip sense filter.
With R
TSN
, R
TSP
, forms second 2 Hz filter pole.
With R
TS2
, forms first 2 Hz filter pole.
With C
RTS1
, R
TSP
, forms second 2 Hz filter pole.
With C
RTS1
, R
TSN
, forms second 2 Hz filter pole.
C
RTS1
C
RTS2
R
TSN
R
TSP
Ground Start
C
ICM
R
GDET
R
ICM2
0.022
μ
F, 20%, 5 V
0.27
μ
F, 20%, 100 V
2 M
, 5%, 1/8 W
2 M
, 5%, 1/8 W
0.47
μ
F, 20%, 10 V
100 k
, 20%, 1/8 W
82.5 k
, 1%, 1/8 W
Provides 60 Hz filtering for ring ground detection.
Digital output pull-up resistor.
Sets ring ground detection threshold.
Design Parameter
Parameter Value
Components Adjusted
Loop Closure Threshold
10 mA
R
LCTH
dc Loop Current Limit
40 mA
R
PROG
dc Feed Resistance
185
R
PT
, R
PR
2-wire Signal Overload Level
3.14 dBm
—
ac Termination Impedance
600
600
R
T1
, R
GP
, R
RCV
Hybrid Balance Line Impedance
R
HB1
Transmit Gain
0 dB
R
T2
, R
X
Receive Gain
0 dB
R
RCV
, R
GP
, R
T1
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