參數(shù)資料
型號： LUCL9218GAR-DT
英文描述： CAT5E PATCH CABLES SNAGLESS,BLUE 100 FT
中文描述： 低成本線接口
文件頁數(shù)： 24/30頁
文件大?。?/td> 378K
代理商： LUCL9218GAR-DT
24
Agere Systems Inc.
Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
Applications
(continued)
ac Design
(continued)
Example 1: Real Termination (First-Generation Codec)
(continued)
The following design equations refer to the circuit in Figure 16. Use these to synthesize real termination imped-
ance.
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:
R
HB
=
h
bal
= 20log
I
T R
–
--------------
Z
T
2R
P
R
GP
1
--------
R
RCV
-----------
+
+
----------------------------------
+
=
V
fr
-------------
R
GP
1
R
T3
---------------
---------------
+
+
1
Z
T/R
------------
+
-------------------------------------------------------------------------------------
V
T R
--------------
X
R
T6
----------
Z
T
----------
V
T R
--------------
×
g
tx
g
rcv
------------------------
R
HB
-----------
g
tx
–
g
rcv
×
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