LUCL9219AAR-D AGERE [Agere Systems], LUCL9219AAR-D Datasheet - Page 25

• Manufacturer Part Number: LUCL9219AAR-D
• Description: Low-Cost Line Interface with Reverse Battery and Dual Current Limit
• 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.
R
------ -
C
tx
rcv =
bal
T
T/R
TG
TGP
TGS
G
N
N1
1
R
T 1
R
= R
T
=
=
= 20log
= R
T2
= R
= R
N2
=
----------
R
= 8.06 k
=
----------------------------------------------- -
1
=
R
T1
----------------------------------------- -
R
=
--------------- -
201.2
T6
=
+
X
7.86
TGP
N2
1
R
------ -
R
2R
TGP
+ R
R
-------------- -
+ R
1
2
------------ -
3038
R
----------- -
201.2
2R
--------------- -
201.2
7.86
RCV
P
7.86
T3
|| (R
3038
------------ -
R
R
2R
T2
1
R
2
(continued)
+
P
TGP
2
----------- -
R
---------- -
C
|| C
R
1
|| C
2
+
----------- -
201.2
1
P
N1
HB
7.86
+
TGS
X
C
R
-------------- -
R
R
G
T
------------------------------------ -
Z
---------- -
R
------------- -
R
–
(continued)
Z
RCV
R
---------------------------------- -
1
GP
2
TG
+ C
R
TGS
TGP
T
g
N1
R
+
tx
TGP
R
T G P
-------- -
R
x C
R
+
G
N2
----------------------- -
1
G P
)
---------------------------------- -
1
T 3
R
g
–
+
rcv
+
N2
1
+
1
-------------
Z
R
-------- -
R
R
Z
T R
----------- -
R
2
TGS
G P
T3
R
T
R
R C V
1
T3
TGP
+
----------- -
R
+
R
R C V
----------------- -
1
R
T 3
TGS
+
1
–
R
------- -
R
+
----------------- -
1
N 1
N 2
---------- -
C
+
1
TG
1
R
------- -
R
R
N 1
N 2
TGP
------------------------------------ -
R
TGP
|| R
R
R
with Reverse Battery and Dual Current Limit
TGP
TGP
TGS
+
R
TGS
|| R
TGS
2
L9219A/G Low-Cost Line Interface
--------------------------------------------- -
1
+
----------- -
R
R
GP
T3
1
+
-------------- -
R
R
RCV
T3
–
---------------------
1
+
1
R
---------- -
R
N1
N2
25