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參數(shù)資料
| 型號： | L3000N |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Subscriber Line Interface(用戶線路接口設(shè)備) |
| 中文描述： | 用戶線接口（用戶線路接口設(shè)備） |
| 文件頁數(shù)： | 8/28頁 |
| 文件大小： | 374K |
| 代理商： | L3000N |
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The AC characteristic is just the resistance of the
two serial resistors RP.
In Stand-bymode thebatterypolarityis just indirect
condition,that is theTIP wiremore positivethanthe
RING one ; boost battery is not achievable. There
are two possible line conditions where the SLIC is
expectedto be in stand-bymode :
1) ON-HOOK (I
line
< 5mA).Normal on-hook
condition.
2) OFF-HOOK (I
line
> 7mA). Handsetis unhooked,
the SLIC is waiting for command to activate
conversation.
When the SLIC is instand-bymode,the power dis-
sipation of L3000Ndoes not exceed120mW (from
-48V) eventually increased of a certain amount if
some current isflowing into the line.
The power dissipationof L3030 in the same condi-
tion,is typically 120mW.
TheStand-byMode is setwhen thebyte sent to the
L3030 Serial Digital Interfacehas the first two bits
(BIT0R and BIT1R)equalto ”0”.
Settingto0all the8bits ofthecommandsent tothe
digital interfaceof L3030, the bias currents of both
L3000N and L3030 are reduced and only some
parts of the two circuits are active similarly to the
stand-by mode ; in this situation, named power-
down denial, the line sensors are disabled
(ON/OFF-HOOK lineconditionscannotbe recogni-
zed)andthecurrent suppliedto the lineis limited at
0.25mA.
Conversation(CVS) or Active Mode
Inconversationmodeitispossibletoselectbetween
twodifferentDC Characteristicsbythe BIT5Rofthe
Serial Interface.
1) Normal Battery(NB)
2) BoostBattery(BB)
Itisalsopossibletoselect(BIT4R)thepolarityofthe
DC line voltageand (BIT6R-BIT7R) oneof thefour
values of limiting current (25mA or 30mA or 45mA
or 70mA).
Batteryreversecan takeplace either beforeor du-
ring conversation.
As far as the DC characteristicin Normal Batteryis
concerned, three different feeding conditions are
present:
a) currentlimiting region; theDC impedanceof the
SLIC is very high (>20 Kohm) and thereforethe
systemworkslikeacurrentgenerator,thecurrent
value being set through the digital interface
(25/30/45/70mA).
b) standard
feeding
system
characteristicis equalto a – 48V (–60V) battery
(note1),in serieswith tworesistors, whosevalue
is set by external components (see external
componentlist of L3030).
c) low impedance region ; the battery value is
reducedto33V(45V)andtheserial resistanceis
reducedto thevalue specifiedin standby mode,
that is :2
3
x
(
RFS
+
2RP
)
Switchingbetweenthe threeregionis automaticwi-
thout discontinuity, and depends on the loop resi-
stance.Fig.2 showstheDC characteristicinnormal
battery condition.
Whentheboostbatteryconditionisactivatedthelow
impedanceregioncan neverbe reachedby the sy-
region
;
the
Figure2 :
DC Characteristic (n.b.) I
LIM
= 25/30/45/70mA.
Note :
1. This value of voltage battery, named apparent battery, is fixed internally by the control unit and is independent of the actual battery
value. So, the voltagedrop inthelow impedance regionis 15V. Itis alsopossible toincrease up to25V thisvalue setting BIT3Rto1.
L3000N - L3030
8/28
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PDF描述 |
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| L3030 | Subscriber Line Interface(用戶線路接口設(shè)備) |
| L3000S | SLIC Kit Optimized for Applications with Both First and Second Generation Combos(用于短波/超短波通信系統(tǒng)的用戶線接口) |
| L30030G-1 | Class G Fuse Blocks |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| L3000N-C6 | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:Electronic Component |
| L3000NSO | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS |
| L3000S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SUBSCRIBER LINE INTERFACE KIT |
| L3000SX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SUBSCRIBER LINE INTERFACE KIT |
| L3000SX-77 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SUBSCRIBER LINE INTERFACE KIT |
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