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參數(shù)資料
| 型號(hào)： | L3000S |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 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) |
| 中文描述： | 用戶接口工具包優(yōu)化與包括第一代和第二代功放音箱（用于短波/超短波通信系統(tǒng)的用戶線接口應(yīng)用） |
| 文件頁(yè)數(shù)： | 7/32頁(yè) |
| 文件大小： | 298K |
| 代理商： | L3000S |
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c) Ringing (RING)
d) BoostBattery(BB),(seeAppendix B).
The fifth status, Power down (PD), is set by the
output pin PDO of the L3092 that disconnect the
Bias Resistor, RH, of L3000S from ground.
The main difference between Stand-by and
Power down is that in SBY the power consump-
tion on the voltage batteryVB– (– 48V) is reduced
but the L3000S DC Feeding and monitoring cir-
cuits are still active, in PD the power consumption
on VB- is reduced to zero, and the L3000S is
completelyswitched off.
SLIC OPERATING MODES
Through the L3092Digital Interfaceit is possible to
selectsix differentSLICOPERATINGMODES :
1) Conversationor Active Mode (CVS)
2) Stand- By Mode (SBY)
3) Power- Down Mode (PD)
4) AutomaticStand - By Mode (ASBY)
5) TestMode (TS)
6) RingingMode (RNG)
1) CONVERSATION (CVS) OR ACTIVE MODE
This operating mode is set by the control proces-
sor when the Off hook condition has been recog-
nized,
As far as the DC Characteristic is concerned two
different feeding conditionsare present :
a) Current limiting region : the DC impedance of
the SLIC is very high (> 20K
) and therefore the
system works like a current generator. By the
L3092 Digital Interface it is possible to selects the
value of the limiting current.:
60mA, 40mA or 25mA.
b) A standardresistive feeding mode : the charac-
teristic is equal to a battery voltage (VB-) minus
5V, in series with a resistor,whose value is set by
external components (see external component list
of L3092).
Switching between the two regions is automatic
without discontinuity, and depends on the loop re-
sistance. The SLIC AC characteristics are guar-
anteed in both regions.
Fig. 1 shows the DC characteristic in conversa-
tion mode.
Fig. 2 shows the line current versus loop resis-
tance for two different battery values and RFS =
200
.
The allowed maximum loop resistance depends
on the values of the battery voltage (VB), on the
RFS and on the value of the longitudinal current
(I
GDK
). With a batteryvoltage of 48V, RFS = 200
and I
GDK
= 0mA, the maximum loop resistance is
over 3000
and with I
GDK
= 20mA is about
2000
(see Application Note on maximum loop
resistancefor L3000S/L3092SLIC KIT).
In conversation mode the AC impedance at the
line terminals is synthetized by the external com-
ponents ZAC and RP, according to the following
formula:
ZML=ZAC
25
Depending the characteristic of the ZAC network,
ZML can be either a pure resistance or a complex
impedance. This allows for ST SLIC to meet dif-
ferent standards as far as the return loss is con-
cerned. The capacitor CCOMP guarantees stabil-
ity to the system.
The two to four wire conversion is achieved by
means of a circuit that can be represented as a
Wheatstonebridge,the branchesof which being:
1) The line impedance(Zline).
2) The SLIC impedance at line terminals(ZML).
3) The balancing network ZA connected between
RX input and ZB pin of L3092.
4) The network ZB between ZB pin and ground
that shall copy the lineimpedance.
It is important to underline that ZA and ZB are not
equal to ZML and to Zline. They both must be
multiplied by a factor in the range of 10 to 25, al-
lowinguse of smaller capacitors.
In case theL3000S/L3092kitis usedwitha second
generation
programmable
TS5070FN)which is able to performthe twoto four
wire conversion, the two impedances ZA and ZB
canbe removedandthe ZB pinconnectedto GND.
The -6dB Tx gain of the L3000S/L3092SLIC kit in
fact allows to keep the echo signal always within
the COMBO Hybrid BalanceFilter dynamicrange.
In conversation mode, the L3000S dissipates
about 250mW for its own operation. The dissipa-
tion related to the current suppliedto the line shall
be added, in order to get thetotal dissipation.
+
2
RP
COMBO
(EG
Table 1.
Pin 12 of L3092 Pin 12 of L3000S (C2)
0
Conversation
B.B
Ringing
+3
–3
Pin 13 of L3092
(C1)
Pin 11 of L3000S
+3
0
–3
Stand-by
Not Used
Not Used
Not Used
Not Used
Not Used
L3000S - L3092
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