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參數(shù)資料
| 型號(hào)： | LUCL8560DAU-DT |
| 英文描述： | Low-Power SLIC with Ringing |
| 中文描述： | 低功耗振鈴用戶接口 |
| 文件頁數(shù)： | 42/46頁 |
| 文件大?。?/td> | 842K |
| 代理商： | LUCL8560DAU-DT |
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42
Lucent Technologies Inc.
Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Applications
(continued)
Design Examples
(continued)
Receive Gain
Ratios of R
RCV
, R
T3
, 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 via 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])
+ 20 log
R
X
(dB) = 20 log g
RCV
Then:
g
RCV
=
and low-frequency termination
Z
TER(low)
=
+ 2R
P
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
R
N2
=
C
G
R
TGP
R
N1
= R
N2
There is an input offset voltage associated with nodes
R
CVN
and R
CVP
. To minimize the effect of 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 40 on page 43 (with dc block-
ing capacitors). To meet this requirement, R
N2
= R
GP
||
R
T3
.
Hybrid Balance
Set the hybrid cancellation via R
HB
.
R
HB
=
EQ
600
R
1
R
T3
---------------
R
GP
---------------
+
+
-----------------------------------------------
R
GP
1
-----------
R
RCV
---------------
+
+
--------------------------------------------
P
3200
2R
3200
2R
P
-------------------------
TGS
R
TGP
1
–
g
RCV
g
TX
×
------------------------------
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| LUCL8560EP-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Power SLIC with Ringing |
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| LUCL8560GP-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Power SLIC with Ringing |
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