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參數(shù)資料
| 型號(hào)： | STLC3055 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| 中文描述： | 環(huán)路 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大小： | 153K |
| 代理商： | STLC3055 |
LayoutRecommendation
A properly designed PCB layout is a basic issue
to guarantee a correct behaviour and good noise
performances.
Particular care must be taken on the ground con-
nection and in this case the star configuration al-
lows surely to avoid possibleproblems (see Appli-
cationDiagram Fig.7).
The ground of the power supply (VPOS) has to
be connected to the center of the star, let’s call
this point PGND. This point should show a resis-
tance as low as possible, that means it should be
a ground plane.
Noise sources can be identified in not enough
good grounds, not enough low impedance sup-
plies and parasitic coupling between PCB tracks
and high impedancepins of the device.
In particular to avoid noise problems the layout
should prevent any coupling between the DC/DC
converter components and analog pins that are
referred to AGND (ex: RD, IREF, RTH, RLIM,
VF). As a first reccomendation the components
CV, L, D1, CVPOS, RSENSE should be kept as
close as possible to each other and isolated from
the other components.
Additionalimprovements can be obtained:
decouplingthe center of the star from the ana-
log ground of STLC3055using smallchokes.
adding a capacitor in the range of 100nF be-
tween VPOS and AGND in order to filter the
switch frequencyon VPOS.
ExternalComponents List
In order to properly define the external compo-
nents value the following system parameters
have to be defined:
The AC input impedanceshown by the SLIC at
the line terminals ”Zs” to which the return loss
measurement is referred. It can be real (typ.
600
) orcomplex.
The AC balance impedance, it is the equiva-
lent impedance of the line ”Zl” used for evalu-
ation of the trans-hybrid loss performances
(2/4 wire conversion). It is usually a complex
impedance.
The value of the two protection resistors Rp in
series with the line termination.
The line impedance at the TTX frequency
”Zlttx”.
The metering pulse level amplitude measured
at line termination ”V
LOTTX
”. In case of low or-
der filtering, V
LOTTX
represents the amplitude
(Vrms) of the fundamental frequency compo-
nent. (typ12 or 16KHz).
Pulse metering envelope rise and decay time
constant”
τ
”.
The slope of theringing waveform”
V
TR
/
T
”.
The value of the constant current limit current
”Ilim”.
The value of the off-hook current threshold
”I
TH
”.
The value of the ring trip rectified average
thresholdcurrent”I
RTH
”.
The value of the required self generatednega-
tive battery ”V
BATR
”
in ring mode (max value
is 70V). This value can be obtained from the
desiredring peak level + 5V.
The value of the maximum current peak sunk
from Vpos”IPK”.
STLC3055
9/22
相關(guān)PDF資料 |
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| STLC3055Q | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3055QTR | WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065 | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065QTR | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
| STLC3065Q | WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STLC3055N | 制造商:STMicroelectronics 功能描述: |
| STLC3055N_09 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WLL and ISDN-TA subscriber line interface circuit |
| STLC3055Q | 功能描述:電信線路管理 IC WLL/ISDN-A SLIC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| STLC3055QTR | 功能描述:電信線路管理 IC WLL/ISDN-A SLIC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| STLC3065 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:WLL SUBSCRIBER LINE INTERFACE CIRCUIT |
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