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参数资料
| 型号： | ATTL7554P-TR |
| 英文描述： | L7554 Low-Power SLIC |
| 中文描述： | L7554低功耗用户接口 |
| 文件页数： | 26/28页 |
| 文件大小： | 486K |
| 代理商： | ATTL7554P-TR |
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26
Lucent Technologies Inc.
Data Sheet
March 1997
L7554 Low-Power SLIC
R
HB
×
gtx
g
rcv
--------------------
T3
=
1
Applications
(continued)
ac Design
(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:
Receive Gain:
Transmit Gain:
Hybrid Balance:
hbal = 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 that the test net-
work is the same as the termination impedance.
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
Example 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.
z
t
v
T R
i
tr
–
----------
=
z
t
2R
P
80
R
GP
1
--------
R
RCV
-----------
+
+
-----------------------------------
+
+
=
g
rcv
v
T R
v
fr
----------
=
g
rcv
1
R
T1
-----------
R
GP
-----------
+
+
1
Z
T R
----------
+
------------------------------------------------------------------
=
g
tx
v
T R
----------
=
g
tx
X
R
T2
-------
Z
T R
----------
×
=
------------
h
bal
20
R
HB
--------
gtx
g
rcv
×
–
log
=
z
t
2R
P
80
R
GN
1
--------
R
RCV
-----------
+
+
-----------------------------------
T5
R
T4
Z
(
)
+
+
=
2R
P
80
k Z
T5
)
+
+
=
grcv
RCV
R
GN
R
+
1
t
Z
T/R
---z
+
------------------------------------8
=
gtx
R
T
6
X
--R
Z
T/R
400
×
T5
R
T4
Z
×
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ATTL7557AAU | 制造商:AGERE 制造商全称:AGERE 功能描述:Low-Power SLICs with Battery Switch |
| ATTL7557AAU-TR | 制造商:AGERE 制造商全称:AGERE 功能描述:Low-Power SLICs with Battery Switch |
| ATTL7561AP | 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 |
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