LUCL9218AAR-D AGERE [Agere Systems], LUCL9218AAR-D Datasheet - Page 25

• Manufacturer Part Number: LUCL9218AAR-D
• Description: Low-Cost Line Interface
• Manufacturer: AGERE [Agere Systems]

Data Sheet
November 2001
Agere Systems Inc.
Applications
ac Design
Example 2: Complex Termination (First-Generation Codec)
Below are design equations for complex termination (see Figure 17 and Figure 18).
Z
g
g
h
where:
Z
Z
R
R
C
and
C
R
The equations above do not include the blocking capacitors.
------ -
C
tx
rcv =
bal
T
T/R
TG
TGP
TGS
G
N
N1
1
R
R
R
= R
T
=
=
= 20log
= R
T2
= R
= R
T1
N2
=
----------
R
= 8.06 k
=
----------------------------------------------- -
1
R
T1
----------------------------------------- -
R
=
--------------- -
201.2
T6
=
+
=
X
7.86
TGP
N2
1
R
------ -
R
TGP
+ R
R
-------------- -
+ R
1
2
------------ -
3168
R
----------- -
201.2
2R
2R
--------------- -
201.2
7.86
----------------- -
RCV
7.86
3168
T3
|| (R
R
R
2R
T2
1
R
2
(continued)
P
P
TGP
2
----------- -
R
---------- -
C
|| C
R
1
|| C
2
+
+
P
1
N1
HB
+
TGS
X
C
R
-------------- -
----------- -
201.2
R
R
7.86
G
T
------------------------------------ -
Z
---------- -
–
(continued)
Z
RCV
R
R
------------- -
R
---------------------------------- -
1
GP
2
TG
+ C
R
T
g
N1
TGS
TGP
R
+
tx
TGP
R
T G P
-------- -
R
x C
R
+
G
N2
----------------------- -
1
G P
)
T 3
R
g
–
+
rcv
---------------------------------- -
1
N2
1
+
1
-------------
Z
R
+
Z
T R
----------- -
R
2
TGS
-------- -
R
R
R
T
R
R C V
G P
T3
T3
TGP
1
+
+
----------- -
R
----------------- -
1
R
R
R C V
TGS
+
T 3
1
R
------- -
R
–
+
N 1
N 2
---------- -
C
----------------- -
1
1
TG
+
1
R
R
------- -
R
TGP
N 1
N 2
------------------------------------ -
R
TGP
|| R
R
R
TGP
TGP
TGS
+
R
TGS
|| R
TGS
2
L9218A/G Low-Cost Line Interface
--------------------------------------------- -
1
+
----------- -
R
R
GP
T3
1
+
-------------- -
R
R
RCV
T3
–
---------------------
1
+
1
R
---------- -
R
N1
N2
25