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| 型號(hào)： | L7554 |
| 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(yè)數(shù)： | 21/28頁(yè) |
| 文件大小： | 476K |
| 代理商： | L7554 |
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Lucent Technologies Inc.
21
Data Sheet
March 1997
L7554 Low-Power SLIC
Applications
(continued)
dc Applications
(continued)
12-2563 (C)
Figure 26. 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
(
) is the protection resistor value, and 40
is the
output series resistance of each internal amplifier.
Z
T/R
(
) is the ac loop impedance.
Example 1, On-hook Transmission of a Meter Pulse:
Signal level: 2.2 Vrms into 200
35
protection resistors
I
LOOP
= 0 (on-hook transmission of the metering
signal)
Accounting for V
SAT
tolerance of 0.5 V, a nominal
overhead of 9.9 V would ensure transmission of an
undistorted 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 27 shows the equivalent input circuit to
adjust the overhead.
12-2562 (C)
Figure 27. Equivalent Circuit for Adjusting the
Overhead Voltage
The overhead voltage is programmed by using the fol-
lowing equation:
V
OH
= 6.5 – 4 V
DCR
–
V
T/R
[Z
T/R
]
V
AMP
–
+
R
OC
/2
R
P
R
P
+
R
OC
/2
V
OH
V
SAT
1
-----------------------------
+
)
Z
T R
+
v
T R
+
=
Λ
V
SAT
1
-----------------------------
+
)
Z
T R
+
---------------
10
dBm 20
×
+
=
V
OH
4.0
1
2 35
40
+
)
200
+
2 2.2
)
+
=
9.4 V
=
DCR
25 k
±
30%
R1
R2
–5 V
6.5
4
5
||
R
2
R
1
25k
+
||
-------------------------------------
×
–
–
=
6.5
20
||
R
2
R
1
25k
+
||
-------------------------------------
+
=
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