LUCL9310AP-D AGERE [Agere Systems], LUCL9310AP-D Datasheet - Page 52

• Manufacturer Part Number: LUCL9310AP-D
• Description: Line Interface and Line Access Circuit Full-Feature SLIC,Ringing Relay,and Test Access Device
• Manufacturer: AGERE [Agere Systems]

Full-Feature SLIC, Ringing Relay, and Test Access Device
ac Applications
First-Generation Codec ac Interface Net-
work: Complex Termination
Receive Gain
Ratios of R
termination and receive gain for the complex case. In
the complex case, additional high-frequency compen-
sation, via C
loss characteristic. For resistive termination, C
and R
resistor.
Determine the receive gain, g
the impedance transformation in a manner similar to
transmit gain.
R
R
Then:
g
and low-frequency termination
Z
52
RCV
TER(low)
X
X
(dB) = R
(dB) = 20 log g
=
N2
----------------------------------------------- -
1
=
are not used and RCVN is tied to ground via a
+
R
---------------
RCV
--------------------------------------------
1
X (specified[dB])
R
N
RCV
+
T3
, R
, R
----------- -
R
4
R
N1
2400
GP
+
T3
T3
RCV
, and R
R
---------------
, R
R
+
RC V
GP
---------------
R
GP
R
(continued)
RCV
T3
+ 20 log
will set both the low-frequency
N2
+ 2R
, is needed for the return
RCV
P
, taking into account
+ 76
R
---------- -
600
(continued)
EQ
N
, R
N1
,
Z
ing low frequency (C or C´ is open).
R
These two equations are best solved using a computer
spreadsheet.
Next, solve for the high-frequency return loss compen-
sation circuit, C
C
R
There is an input offset voltage associated with nodes
RCVN and RCVP. To minimize the effect of mismatch
of this voltage at T/R, the equivalent resistance to ac
ground at RCVN should be approximately equal to that
at RCVP.
Hybrid Balance
Set the hybrid cancellation via R
R
TER(low)
P
N
N1
HB
R
is the series protection resistor.
= R
N2
=
=
------------------------------ -
g
N2
is the specified termination impedance assum-
--------------------------------- -
RC V
2R
R
--------------------------------- -
2R
P
2400
X
+
g
N
2400
P
76
TX
, R
+
76
N1
, and R
C
G
R
------------- -
R
R
TGS
TGP
TGP
N2
:
HB
–
.
1
Agere Systems Inc.
July 2001