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參數(shù)資料
| 型號： | L7556 |
| 英文描述： | Low-Power SLICs with Battery Switch |
| 中文描述： | 低功耗SLIC組件的電池開關(guān) |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 700K |
| 代理商： | L7556 |
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Lucent Technologies Inc.
15
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
* Contact your Lucent Technologies account representative for protector recommendations. Choice of this (and all) component(s) should be
evaluated and confirmed by the customer prior to use in any field or laboratory system. Lucent does not recommend use of this part in the
field without performance verification by the customer. This device is suggested by Lucent for customer evaluation. The decision to use a
component should be based solely on customer evaluation.
Name
Value
Function
Integrated Circuits
SLIC
Protector
Ringing Relay
Codec
Overvoltage Protection
R
PT
R
PR
Power Supply
C
BAT1
C
BAT2
C
CC
C
F1
C
F2
D
BAT
dc Profile
R
PROG
ac Characteristics
C
B1
C
B2
R
T1
R
RCV
R
GP
L7556/7557
Crowbar protector*
L7581
T7504
Subscriber loop interface circuit (SLIC).
Secondary protection.
Switches ringing signals.
First-generation codec.
50
, PTC or Fusible
50
, PTC or Fusible
Protection resistor.
Protection resistor.
0.1 μF, 20%, 100 V
0.1 μF, 20%, 100 V
0.1 μF, 20%, 10 V
0.47 μF, 20%, 100 V
0.1 μF, 20%, 100 V
100 V, 150 mA
V
BAT1
filter capacitor.
V
BAT2
filter capacitor.
V
CC
filter.
With C
F2
, improves idle channel noise.
With C
F1
, improves idle channel noise.
Transient protection diode.
66.8 k
, 1%, 1/16 W
Sets dc loop current limit.
0.47 μF, 20%, 10 V
0.47 μF, 20%, 10 V
54.9 k
, 1%, 1/16 W
84.5 k
, 1%, 1/16 W
57.6 k
, 1%, 1/16 W
ac/dc separation capacitor.
ac/dc separation capacitor.
With R
GP
and R
RCV
, sets ac termination impedance.
With R
GP
and R
T1
, sets receive gain.
With R
T1
and R
RCV
, sets ac termination impedance
and receive gain.
Loop stability.
With R
X
, sets transmit gain in codec.
With R
T2
, sets transmit gain in codec.
Sets hybrid balance.
C
GP
R
T2
R
X
R
HB1
330 pF, 10 V, 20%
18.7 k
, 1%, 1/16 W
90.9 k
, 1%, 1/16 W
90.9 k
, 1%, 1/16 W
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