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參數(shù)資料
| 型號： | 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)： | 8/22頁 |
| 文件大?。?/td> | 153K |
| 代理商： | STLC3055 |
obtained with a 20Hz and 25Hz ring frequency
and with 1REN. This value are valid either with
Europeanor USA specification:
CREV
CREST
FACTOR
@20Hz
CREST
FACTOR
@25Hz
22nF
1.2
1.26
27nF
1.25
1.32
33nF
1.33
Not significant (*)
(*) Distorsion already less than 10%.
The ring trip detection is performed sensing the
variation of the AC line impedance from on hook
(relatively high) to off-hook (low). This particular
ring trip method allows to operate without DC off-
set superimposed on the ring signal and therefore
obtaining the maximum possible ring level on the
load starting from a givennegative battery.
It should be noted that such a method is opti-
mised for operationon shortloop applicationsand
may not operateproperly in presenceof long loop
applications(>500
).
Once ring trip is detected,the DET output is acti-
vated (logic level low), at this point the card con-
troller or a simple logic circuit should stop the D2
toggling in order to effectively disconnect the ring
signal and then set the STLC3055 in the proper
operatingmode (normally ACTIVE).
RING LEVEL IN PRESENCE OF MORE TELE-
PHONE IN PARALLEL
As already mentioned above the maximum cur-
rent that can be drawn from the Vpos supply is
controlledand limited via theexternalRSENSE.
This will limit also the power available at the self
generatednegative battery.
If for any reason the ringer load will be too high
the self generated battery will drop in order to
keep the power consumptionto the fixed limit and
therefore also the ring voltage level will be re-
duced.
In the typical application with R
SENSE
= 110m
the peak current from Vpos is limited to about
900mA, which correspond to an average current
of 700mA max. In this condition the STLC3055
can drive up to 3REN with a ring frequency
fr=25Hz (1REN = 1800
+ 1.0
μ
F, European
standard).
In order to drive up to 5REN (1REN= 6930
+
8
μ
F, US standard) it is necessary to modify the
externalcomponentsas follows:
CREV = 15nF
RD = 2.2K
Power On Requirements
In order to avoid damage to the device when
Vpos is first applied it is recommendedto keep all
the logic inputs to a low logic level (0V) until Vpos
is >5.5V.
In case this power up sequence cannot be guar-
anteed it’s recommendedto connecta shottkydi-
ode (BAT46 or equivalent) between VBAT and
BGND see figurebelow.
GND
TIP
RING
VBAT
dV/dT set
by CREV
2.5V typ.
65V
typ.
2.5V typ.
Figure 5.TIP/RINGtypical ringingwaveform
BAT46
BGND
VBAT
STLC3055
Figure 6. Shottkydiode connection
STLC3055
8/22
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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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