參數(shù)資料
型號(hào)： L9219A
英文描述： CAP CER 390PF 3.15KVDC R3 RAD
中文描述： 低成本線接口，具有反向電池和雙電流限制
文件頁(yè)數(shù)： 25/30頁(yè)
文件大?。?/td> 397K
代理商： L9219A
Agere Systems Inc.
25
Data Sheet
November 2001
with Reverse Battery and Dual Current Limit
L9219A/G Low-Cost Line Interface
Applications
(continued)
ac Design
(continued)
Example 2: Complex Termination (First-Generation Codec)
Below are design equations for complex termination (see Figure 17 and Figure 18).
Z
T
= R
T1
+ R
T2
|| C
T
R
TGP
|| R
TGS
R
TGP
|| R
TGS
g
tx
=
g
rcv =
h
bal
= 20log
where:
Z
T/R
= R
1
+ R
2
|| C
Z
TG
= R
TGP
|| (R
TGS
+ C
G
)
R
TGP
= 8.06 k
1
R
2
R
TGS
=
R
TGP
C
G
=
x C
and
C
N
R
N2
=
C
G
R
TGP
R
N1
= R
N2
The equations above do not include the blocking capacitors.
R
T1
2R
P
201.2
-----------
1
R
GP
--------
R
RCV
-----------
+
+
----------------------------------
1
R
N2
--------
+
-----------------
–
+
=
R
T2
201.2
-----------
R
GP
1
--------
R
RCV
-----------
+
+
----------------------------------
1
R
N2
--------
+
-----------------
+
=
C
T
------
201.2
----------------
C
N1
----------
+
R
N1
R
N2
(
)
2
------------------------------------
R
TGP
R
TGS
||
C
TG
----------
+
R
TGP
R
TGS
------------------------------------
2
1
R
GP
-----------
R
RCV
---------------
+
+
----------------------------------------------
R
N2
1
----------
+
---------------------
–
+
=
X
R
T6
----------
201.2
----------------
Z
T
----------
1
R
T3
---------------
R
GP
R
HB
---------------
+
+
-----------------------------------------------
1
Z
T R
-------------
+
-----------------------
×
-----------
g
tx
–
g
rcv
×
-------
(
R
TGP
R
1
R
2
+
)
------------------------------------------
P
3038
-2R
3038
2R
P
-------------------------
TGS
R
TGP
1
–
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