- 您現(xiàn)在的位置：買賣IC網 > PDF目錄367613 > LUCL9214GAJ-DT Low-Cost Ringing SLIC PDF資料下載
參數(shù)資料
| 型號： | LUCL9214GAJ-DT |
| 英文描述： | Low-Cost Ringing SLIC |
| 中文描述： | 低成本振鈴用戶接口 |
| 文件頁數(shù)： | 36/46頁 |
| 文件大?。?/td> | 790K |
| 代理商： | LUCL9214GAJ-DT |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁當前第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁
Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
36
Agere Systems Inc.
ac Applications
(continued)
Design Examples
(continued)
ac Interface Using First-Generation Codec
(contin-
ued)
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 RCVN is tied to ground via a
resistor.
Determine the receive gain, g
rcv
, taking into account the
impedance transformation in a manner similar to trans-
mit 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
+ 36
Z
TER(low)
is the specified termination impedance assum-
ing low frequency (C or C
′
is open).
R
P
is the series protection resistor.
36
is the typical internal feed resistance.
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
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. Refer to Figure 16 (with dc blocking capaci-
tors). To meet this requirement, R
N2
= R
GP
|| R
T3
.
Hybrid Balance
Set the hybrid cancellation via R
HB
.
R
HB
=
If a 5 V only codec such as the Agere T7504 is used,
dc blocking capacitors must be added as shown in Fig-
ure 16. 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.
Typically, values of 0.1 μF to 0.47 μF capacitors are
used for dc blocking. The addition of blocking capaci-
tors will cause a shift in the return loss and hybrid bal-
ance frequency response toward higher frequencies,
degrading the lower-frequency response. The lower
the value of the blocking capacitor, the more pro-
nounced the effect is, but the cost of the capacitor is
lower. It may be necessary to scale resistor values
higher to compensate for the low-frequency response.
This effect is best evaluated via simulation. A
PSPICE
model for the L9214 is available.
Design equation calculations seldom yield standard
component values. Conversion from the calculated
value to standard value may have an effect on the ac
parameters. This effect should be evaluated and opti-
mized via simulation.
EQ
600
R
1
R
T3
---------------
R
GP
---------------
+
+
-----------------------------------------------
R
GP
1
-----------
R
RCV
---------------
+
+
--------------------------------------------
P
2400
2R
2400
2R
P
-------------------------
TGS
R
TGP
1
–
×
g
rcv
g
tx
------------------------
相關PDF資料 |
PDF描述 |
|---|---|
| LUCL9214GAU-D | Low-Cost Ringing SLIC |
| LUCL9214GAU-DT | Low-Cost Ringing SLIC |
| LUCL9214GRG-D | Planar E Core |
| LUCL9214GRG-DT | Low-Cost Ringing SLIC |
| LUCL9214ARG-DT | Low-Cost Ringing SLIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LUCL9214GAU-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Ringing SLIC |
| LUCL9214GAU-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Ringing SLIC |
| LUCL9214GRG-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Ringing SLIC |
| LUCL9214GRG-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Ringing SLIC |
| LUCL9215AAU-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Short-Loop Sine Wave Ringing SLIC |
發(fā)布緊急采購，3分鐘左右您將得到回復。