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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)： | 21/32頁 |
| 文件大小： | 526K |
| 代理商： | L8551 |
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Lucent Technologies Inc.
21
Data Sheet
March 1997
L8551 Low-Power SLIC
Applications
(continued)
dc Applications
(continued)
Overhead Voltage
(continued)
12-2560 (C)
Figure 27. SLIC 2-Wire Output Stage
In addition to the required peak signal level, the SLIC
needs about 2 V from each power supply to bias the
amplifier circuitry. It can be thought of as an internal
saturation voltage. Combining the saturation voltage
and the peak signal level, the required overhead can be
expressed as:
where V
SAT
is the combined internal saturation voltage
between the Tip/Ring amplifiers and V
SAT
(4.0 V typ.).
R
P
(W) is the protection resistor value, R
S
is the resis-
tance of the L7581 solid-state switch, and 65 W is one-
half the dc feed resistance of the SLIC. Z
T/R
(
) is the
ac loop impedance.
Example 1: On-Hook Transmission of a Meter Pulse
Signal level: 2.2 Vrms into 200
20
protection resistors
28
solid-state switch on resistance
I
LOOP
= 0 (on-hook transmission of the metering
signal)
= 10.6 V
Accounting for V
SAT
tolerance of 0.5 V, a nominal over-
head of 10.1 V would ensure transmission of an undis-
torted 2.2 V metering signal.
Adjusting Overhead Voltage
To adjust the open loop 2-wire voltage, pin DCR is
programmed at the midpoint of a resistive divider from
ground to either –5 V or V
BAT
. In the case of –5 V, the
overhead voltage will be independent of the battery
voltage. Figure 28 shows the equivalent input circuit to
adjust the overhead.
12-2562 (C)
Figure 28. Equivalent Circuit for Adjusting the
Overhead Voltage
The overhead voltage is programmed by using the fol-
lowing equation:
–
V
T/R
[Z
T/R
]
V
AMP
–
+
R
DC
/2
R
P
R
P
+
R
DC
/2
V
OH
V
SAT
1
-------------+
Z
T R
+
)
+
V
--
T R
+
=
V
OH
4.0
1
2 20
28
65
+
200
+
)
+
2 2.2
)
+
=
DCR
25 k
±
30%
R1
R2
–5 V
V
OH
6.5
4V
DCR
–
=
6.5
4
5
||
R
2
R
1
25k
+
||
R
1
25k
+
||
-------------------------------------
×
–
–
=
6.5
20
R
2
-------------------------------------
+
=
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