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| 型号： | LUCL9219GAR-DT |
| 英文描述： | Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
| 中文描述： | 低成本线接口，具有反向电池和双电流限制 |
| 文件页数： | 18/30页 |
| 文件大小： | 397K |
| 代理商： | LUCL9219GAR-DT |
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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).
ZT = RT1 + RT2 || CT
RTGP || RTGS
gtx =
grcv =
hbal = 20log
where:
ZT/R = R1 + R2 || C
ZTG = RTGP || (RTGS + CG)
RTGP = 8.06 k
RTGS =
RTGP
CG =
x C
and
CNRN2 =
CG RTGP
RN1 = RN2
The equations above do not include the blocking capacitors.
RT1
2RP
7.86
201.2
------------
1
RT3
RGP
---------
RT3
RRCV
------------
++
-----------------------------------
1
RN1
RN2
--------
+
------------------
–
+
=
RT2
7.86
201.2
------------
RTGP RTGS
1
RT3
RGP
---------
RT3
RRCV
------------
++
-----------------------------------
1
RN1
RN2
--------
+
------------------
+
=
1
CT
-------
7.86
201.2
----------------
1
CN1
-----------
RN2
RN1
RN2
+
()2
-------------------------------------
RTGP RTGS
||
1
CTG
-----------
RTGP
RTGS
+
-------------------------------------
2
1
RT3
RGP
------------
RT3
RRCV
---------------
++
----------------------------------------------
1
RN1
RN2
-----------
+
---------------------
–
+
=
RX
RT6
----------
1
201.2
----------------
ZTG
ZT
-----------
7.86
1
RRCV
RT3
---------------
RRCV
RGP
---------------
++
------------------------------------------------
1
ZT
ZTR
-------------
+
------------------------
×
RX
RHB
------------
gtx
–
grcv
×
R1
R2
-------
R2
2
RTGP R1
R2
+
()
------------------------------------------
2RP
3038
-------------
3038
2RP
-------------
RTGS
RTGP
--------------
1
–
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