參數(shù)資料
型號(hào)： L7557
廠商： Lineage Power
英文描述： Low-Power SLICs （electronic subscriber loop interface circuits ）with Battery Switch(帶電池開關(guān)的低功耗用戶環(huán)路線接口電路（SLIC）)
中文描述： 低功耗SLIC組件（電子用戶環(huán)路接口電路）與電池開關(guān)（帶電池開關(guān)的低功耗用戶環(huán)路線接口電路電路（SLIC））
文件頁數(shù)： 26/28頁
文件大?。?/td> 753K
代理商： L7557
26
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Applications
(continued)
ac Design
(continued)
Selection Criteria
(continued)
Example 1, Real Termination:
The following design equations refer to the circuit in
Figure 32. Use these to synthesize real termination
impedance.
Termination Impedance:
Z
T
=
Receive Gain:
g
rcv
=
g
rcv
=
Transmit Gain:
g
tx
=
g
tx
=
x
Hybrid Balance:
h
bal
= 20log
To optimize the hybrid balance, the sum of the currents
at the VFX input of the codec op amp should be set to
0. The following expressions assume the test network
is the same as the termination impedance.
h
bal
= 20log
R
HB
=
Example 2, Complex Termination:
For complex termination, the spare op amp is used
(see Figure 33).
The hybrid balance equation is the same as in Exam-
ple 1.
PCB Layout Information
Make the leads to BGND and V
BAT
as wide as possible
for thermal and electrical reasons. Also, maximize the
amount of PCB copper in the area of—and specifically
on—the leads connected to this device for the lowest
operating temperature.
When powering the device, ensure that no external
potential creates a voltage on any pin of the device that
exceeds the device ratings. In this application, some of
the conditions that cause such potentials during pow-
erup are the following: 1) an inductor connected to PT
and PR (this can force an overvoltage on V
BAT
through
the protection devices if the V
BAT
connection chatters),
and 2) inductance in the V
BAT
lead (this could resonate
with the V
BAT
filter capacitor to cause a destructive
overvoltage).
This device is normally used on a circuit card that is
subjected to hot plug-in, meaning the card is plugged
into a biased backplane connector. In order to prevent
damage to the IC, all ground connections must be
applied before, and removed after, all other connec-
tions.
I
T R
–
--------------
Z
T
R
P
80
R
GP
1
--------
R
RCV
-----------
+
+
-----------------------------------
+
+
=
V
FR
-------------
1
T1
---------------
GP
---------------
+
+
1
T/R
------------
+
-------------------------------------------------------------------------------------
T R
--------------
X
R
T2
----------
Z
T R
-------------
V
FR
--------------
R
HB
-----------
g
tx
–
g
rcv
×
×
g
tx
g
rcv
------------------------
Z
T
2R
P
80
R
GN
1
--------
R
RCV
-----------
+
+
-----------------------------------
Z
R
T4
---------
(
)
+
+
=
2R
P
80
k Z
T5
)
+
+
=
g
rcv
1
R
T3
-------------
R
R
GN
-------------
+
+
1
Z
Z
T/R
----------
+
-----------R
=
g
tx
R
X
R
T6
----------
125
Z
T/R
----------
×
Z
R
T4
---------
×
=
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