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參數(shù)資料
| 型號(hào)： | L7556 |
| 廠商： | Lineage Power |
| 英文描述： | Low-Power SLICs （electronic subscriber loop interface circuits ）with Battery Switch(帶電池開關(guān)的低功耗用戶環(huán)路接口電路（SLIC）) |
| 中文描述： | 低功耗SLIC組件（電子用戶環(huán)路接口電路）與電池開關(guān)（帶電池開關(guān)的低功耗用戶環(huán)路接口電路電路（SLIC）） |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 753K |
| 代理商： | L7556 |
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16
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Applications
(continued)
Table 10. Parts List for Loop Start and Ground Start Applications
(continued)
Design Considerations
Table 11 shows the design parameters of the application circuit shown in Figure 11. Components that are adjusted
to program these values are also shown.
Table 11. 600
Design Parameters
Name
Value
Function
Supervision
R
LCTH
R
TS1
R
TS2
24.9 k
, 1%, 1/16 W
402
, 5%, 2 W
274 k
, 1%, 1/16 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 μF, 20%, 5 V
0.27 μF, 20%, 100 V
2 M
, 1%, 1/16 W
2 M
, 1%, 1/16 W
0.47 μF, 20%, 10 V
100 k
, 20%, 1/16 W
82.5 k
, 1%, 1/16 W
Provides 60 Hz filtering for ring ground detection.
Digital output pull-up resistor.
Sets ring ground detection threshold.
Design Parameter
Parameter Value
10 mA
40 mA
180
3.14 dBm
600
600
0 dB
0 dB
Components Adjusted
R
LCTH
R
PROG
R
PT
, R
PR
—
Loop Closure Threshold
dc Loop Current Limit
dc Feed Resistance
2-wire Signal Overload Level
ac Termination Impedance
Hybrid Balance Line Impedance
Transmit Gain
Receive Gain
R
T1
, R
GP
, R
RCV
R
HB1
R
T2
, R
X
R
RCV
, R
GP
, R
T1
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