- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384587 > L9214A (Lineage Power) Low-Cost Ringing SLIC(低價(jià)格振鈴用戶環(huán)路接口電路) PDF資料下載
參數(shù)資料
| 型號(hào)： | L9214A |
| 廠商： | Lineage Power |
| 英文描述： | Low-Cost Ringing SLIC(低價(jià)格振鈴用戶環(huán)路接口電路) |
| 中文描述： | 低成本振鈴用戶接口（低價(jià)格振鈴用戶環(huán)路接口電路） |
| 文件頁(yè)數(shù)： | 35/44頁(yè) |
| 文件大?。?/td> | 964K |
| 代理商： | L9214A |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)當(dāng)前第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)
Preliminary Data Sheet
October 2000
Low-Cost Ringing SLIC
L9214A/G
Lucent Technologies Inc.
35
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 15 (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 Lucent T7504 is used,
dc blocking capacitors must be added as shown in Fig-
ure 15. 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.
* PSPICEis a registered trademark of MicroSim Corporation.
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(guān)PDF資料 |
PDF描述 |
|---|---|
| L9214G | Low-Cost Ringing SLIC(低價(jià)格振鈴用戶環(huán)路接口電路) |
| L9215G | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| L9215A | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| L9216A | Short-Loop Ringing SLIC with Ground Start(接地起動(dòng)的短環(huán)路振鈴用戶接口) |
| L9216G | Short-Loop Ringing SLIC with Ground Start(接地起動(dòng)的短環(huán)路振鈴用戶接口) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L9215A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Short-Loop Sine Wave Ringing SLIC |
| L9216A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Short-Loop Ringing SLIC with Ground Start |
| L9217A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and PPM |
| L9218A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| L9219A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。