參數(shù)資料
型號(hào)： LUCL8576BP-DT
英文描述： Dual Ringing SLIC
中文描述： 雙振鈴用戶接口
文件頁(yè)數(shù)： 23/26頁(yè)
文件大小： 583K
代理商： LUCL8576BP-DT
Agere Systems Inc.
23
Data Sheet
May 2001
L8576B Dual Ringing SLIC
Applications
(continued)
ac Design
(continued)
Receive Gain
Ratios of R
RCV
, R
T1
, R
GP
will set both the low-frequency
termination and receive gain for the complex case. In
the complex case, additional high-frequency compen-
sation, via C
N
, R
N1
, and R
N2
, is needed for the return
loss characteristic. For resistive termination, C
N
, R
N1
,
and R
N2
are not used and R
CVN
is tied to ground and a
resistor.
Determine the receive gain, G
RCV
, taking into account
the impedance transformation in a manner similar to
transmit gain.
R
X
(dB) = R
X (specified[dB])
+ 20log
R
X
(dB) = 20log G
RCV
Then:
G
RCV
=
and low-frequency termination
Z
TER(low)
=
+ 2R
P
EQ
600
R
1
R
T1
---------------
R
GP
---------------
+
+
-----------------------------------------------
GP
1
-----------
RCV
---------------
+
+
--------------------------------------------
Z
TER(low)
is the specified termination impedance assum-
ing low frequency (C or C
′ is open).
R
P
is the series protection resistor.
These two equations are best solved using a computer
spreadsheet.
Next, solve for the high-frequency return loss compen-
sation circuit, C
N
, R
N1
, and R
N2
:
C
N
x
R
N2
=
C
TGS
x
R
TGP
R
N1
= R
N2
There is an input offset voltage associated with nodes
R
CVN
, R
CVP
. To minimize the effect of the mismatch of
this voltage at T/R, the equivalent resistance to ac
ground at R
CVN
should be approximately equal to that
at R
CVP
. Refer to Figure 22 (schematic with dc blocking
capacitors). To meet this requirement, R
N2
= R
GP
|| R
T1
.
Hybrid Balance
Set the hybrid cancellation via R
HB
.
R
HB
=
If a +5 V only codec such as an Agere T8503 is used,
dc blocking capacitors must be added as shown in
Figure 22. This is because the codec is referenced to
+2.5 V and the SLIC to ground. With the ac coupling, a
dc bias at T/R is eliminated and power associated with
this bias is not consumed.
P
1500
2R
1500
2R
P
------------R
R
TGP
-------------
1
–
RCV
TX
×
---------------------------------
5-8413 (F)
Figure 22. ac Interface Circuit Using First-Generation Codec (Including Blocking Capacitors)
R
TGS
R
TSP
= 24.4 k
V
ITR
R
X
R
HB
CODEC OUTPUT
DRIVE AMP
CODEC
OP AMP
–
+
C
C1
R
T1
R
GP
R
N2
R
RCV
RCVN
RCVP
–I
T/R
195
C
TGS
C
B
AX
C
C2
C
N
R
N1
R
T2
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