參數(shù)資料
型號： L8575
英文描述： Dual-Resistive,Low-Cost Subscriber Line Interface Circuit(SLIC)
中文描述： 雙電阻，低成本用戶線接口電路（SLIC）
文件頁數(shù)： 17/36頁
文件大?。?/td> 633K
代理商： L8575
Advance Data Sheet
March 1997
L8575
Dual-Resistive, Low-Cost SLIC
Lucent Technologies Inc.
17
Applications
(continued)
Resistor Module
(continued)
5-3428(F)
Note:
Pin numbers are MMCA31A8575AA pin numbers. Resistors are labeled per MMCA31A8575AA description. Nodes are L8575
SLIC package nodes.
Figure 4. L8575 SLIC Resistor Module
Table 10. MMCA31A8575AA Thick Film Resistor Module
Note: For 50 dB longitudinal balance, 0.2% for 58 dB balances. Continuous power (rms).
Resistor
R
1
R
2
R
3
R
4
R
5
R
6
R
7
R
8
R
9
R
9
/R
1
R
1
/R
2
Value
300
300
100 k
100 k
200 k
200 k
1.4 k
1.4 k
15 k
50
1
1
Tolerance
1.0%
1.0%
1.0%
1.0%
1.0%
1.0%
2.0%
2.0%
—
1.0%
0.35%
0.35%
Power
2.0 W
2.0 W
250 mW
250 mW
250 mW
250 mW
0.5 W
0.5 W
10 mW
—
—
—
Surge Rating
Lightning: Power Cross
Lightning: Power Cross
None
None
Lightning: Power Cross
Lightning: Power Cross
Lightning: Power Cross
Lightning: Power Cross
None
—
—
—
(R
3
+ R
6
)/(R
4
+ R
5
)
TIP
15
FUSE
TIP
19
17
R
7
6
PR
RING
R
1
V
BAT
7
R
9
RGBN
8
GND
9
R
3
RS
10
5
FUSE
RING
1
3
R
4
TS
11
XMT
12
R
5
R
2
R
8
R
6
GND
13
PT
14
Resistors R
1
and R
2
also provide a common-mode
impedance of (300 || 300) 150
. These resistors will
primarily determine the longitudinal balance of the line
circuit; thus they must be matched appropriately to
meet longitudinal balance requirements (0.35% for
50 dB and 0.2% for 58 dB). Also, they have a signifi-
cant impact on the termination impedance of the SLIC.
Feedback using external components (external compo-
nents when a first- or second-generation codec is
used) allows the user to set the termination impedance
at 600
,
or most ITU-T recommended complex termi-
nation impedances.
Resistors R
1
and R
2
, along with R
3
and R
7
, are used in
conjunction with the self-test feature of the L8575
SLIC. In this mode, the Ring current drive amplifier is
saturated to ground, and the Tip amplifier is saturated
to battery, which causes both the ring-trip and loop clo-
sure detectors to trip. Ring-trip and loop closure detec-
tor output are bits RT and LC, respectively, in the serial
output stream.
Under normal operating conditions, resistors R
1
and R
2
will see the battery voltage less the Tip/Ring voltage.
Assuming a Tip/Ring voltage of 6 V (representative of a
short into a handset), the nominal continuous operating
power of R
1
and R
2
is given by:
(48 V – 6 V)
2
/600
= 2.94 W
per R
1
and R
2
resistor pair
2.94 W/2 = 1.47 W per resistor
The operating power rating of R
1
and R
2
is 2 W. This is
the steady-state power rating of R
1
and R
2
, and it is
adequate for normal operating conditions. The ability of
these resistors to withstand fault conditions depends
on the power ratings of the individual resistors and on
the power rating of the thick film resistor module itself.
Obviously, the higher the power capabilities of the
resistor module, the less susceptible the resistors are
to damage during faults. The various fault conditions
are discussed further in the Protection section of this
data sheet.
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