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参数资料
| 型号： | ATTL7554AP |
| 英文描述： | L7554 Low-Power SLIC |
| 中文描述： | L7554低功耗用户接口 |
| 文件页数： | 21/28页 |
| 文件大小： | 486K |
| 代理商： | ATTL7554AP |
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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
+
||
-------------------------------------
+
=
相关PDF资料 |
PDF描述 |
|---|---|
| ATTL7554BP | L7554 Low-Power SLIC |
| ATTL7554BP-TR | L7554 Low-Power SLIC |
| ATTL7554P-TR | L7554 Low-Power SLIC |
| ATTL7554AP | LH1263 E&M Signaling Circuit |
| AU01Z | Fast-Recovery Rectifier Diodes |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ATTL7554BP | 制造商:AGERE 制造商全称:AGERE 功能描述:L7554 Low-Power SLIC |
| ATTL7554BP-TR | 制造商:AGERE 制造商全称:AGERE 功能描述:L7554 Low-Power SLIC |
| ATTL7554P-TR | 制造商:AGERE 制造商全称:AGERE 功能描述:L7554 Low-Power SLIC |
| ATTL7556AAU | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LH1263 E&M Signaling Circuit |
| ATTL7556AAU-TR | 制造商:AGERE 制造商全称:AGERE 功能描述:Low-Power SLICs with Battery Switch |
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