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PDF ( 数据手册 , 数据表 ) L3000S

零件编号 L3000S
描述 SUBSCRIBER LINE INTERFACE KIT
制造商 STMicroelectronics
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L3000S 数据手册, 描述, 功能
L3000S
L3030
SUBSCRIBER LINE INTERFACE KIT
. PROGRAMMABLE DC FEEDING RESIS-TAN-
CE AND LIMITINGCURRENT (fourvalues avai-
lable)
. THREE OPERATING MODES :
STAND-BY, CONVERSATION, RINGING
. NORMAL/BOOSTBATTERY, DIRECT/REVER-
SE POLARITY
. SIGNALLING FUNCTION (off-hook/GND-key)
. FILTERED OFF-HOOK DETECTION IN
STAND-BY (10ms)
. QUICK OFF-HOOK DETECTION IN CONVER-
.. SATION (< 1ms) FOR LOW DIAL PULSE DE-
TECTION DISTORTION
HYBRID FUNCTION
RINGING GENERATION WITH QUASI ZERO
OUTPUT IMPEDANCE, ZERO CROSSING IN-
JECTION (no ext. relay needed) AND RING
TRIP DETECTION
. AUTOMATIC RINGING STOP WHEN OFF-
HOOK IS DETECTED
. PARALLEL AND SERIAL DIGITAL INTERFA-
CES
. TELETAXE SIGNALINJECTION (2VRMS/5VRMS)
. LOW NUMBER OF EXTERNAL COMPO-
NENTS
. GOOD REJECTION OF THE NOISE ON BAT-
TERY VOLTAGE (20dB at 10Hz and 35dB at
1kHz)
. POSSIBILITY TO WORK ALSO WITH HIGH
COMMON MODE CURRENTS
. INTEGRATED THERMAL PROTECTION WITH
THERMAL OVERLOAD INDICATION
. SURFACE MOUNT PACKAGE
(PLCC44 + PowerSO-20)
DESCRIPTION
The ST SLIC KIT (L3000S/L3030) is a set of solid
state devices designed to integratemain of the fun-
ctions needed to interface a telephone line. It con-
sists of 2 integrated devices : the L3000S line
interface circuit and the L3030 control unit.
This kit performs the main features of the BORSHT
functions :
----
Battery feed
Ringing
Signalling
Hybrid
PRELIMINARY DATA
PLCC44
FLEXIWATT15
slug-up
PowerSO20
slug-down
ORDERING NUMBERS :
L3030 (PLCC44)
L3000SX-VM (FLEXIWATT15)
L3000SX (PowerSO20 slug-up)
L3000SX-77 (PowerSO20 slug-down)
Additional functions, such as battery reversal, extra
batteryuse, line overvoltagesensing and metering-
pulse injection are also featured ; most external
characteristics,as AC and DC impedances,are pro-
grammable with external components.The SLIC in-
jects ringing in balanced mode and for that, as well
as for the operation in battery boosted, a positive
battery voltage shall be available on the subscriber
card. As the right ringing signal amplification both in
voltage and in current is provided by SLIC, the ring
signal generatorshall onlyprovide a low level signal
(0.285Vrms).
This kit is fabricatedusing a 140V Bipolar technolo-
gy for L3000Sand a 12V Bipolar I2L technologyfor
L3030.
L3030 is available PLCC44 and L3000S in both
FLEXIWATT15 and PowerSO-20 for surfacemount
application.
This kit is suitable for all the following applications:
C.O. (CentralOffice),DLC (Digital LoopCarrier) and
high range PABX (Private Automatic Branch Ex-
change).
June 1997
1/29







L3000S pdf, 数据表
L3000S - L3030
The AC characteristic is just the resistance of the
two serial resistors RP.
In Stand-bymode the batterypolarity is just in direct
condition,that is the TIP wire more positive than the
RING one ; boost battery is not achievable. There
are two possible line conditions where the SLIC is
expected to be in stand-by mode :
1) ON-HOOK (Iline < 5mA). Normal on-hook
condition.
2) OFF-HOOK (Iline > 7mA). Handset is unhooked,
the SLIC is waiting for command to activate
conversation.
When the SLIC is in stand-by mode, the power dis-
sipation of L3000S does not exceed 120mW (from
-48V) eventually increased of a certain amount if
some current is flowing into the line.
The power dissipation of L3030 in the same condi-
tion, is typically 120mW.
The Stand-byMode is set when the byte sent to the
L3030 Serial Digital Interface has the first two bits
(BIT0R and BIT1R) equal to ”0”.
Settingto 0 all the 8 bits of the command sent to the
digital interface of L3030, the bias currents of both
L3000S 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 line conditions cannot be recogni-
zed) and the current supplied to the line is limited at
0.25mA.
Conversation (CVS) or Active Mode
In conversationmodeit is possibleto selectbetween
two different DC Characteristics by the BIT5R of the
Serial Interface.
1) Normal Battery (NB)
2) Boost Battery (BB)
It is also possibleto select(BIT4R)the polarity of the
DC line voltage and (BIT6R-BIT7R) one of the four
values of limiting current (25mA or 30mA or 45mA
or 70mA).
Battery reverse can take place either before or du-
ring conversation.
As far as the DC characteristic in Normal Battery is
concerned, three different feeding conditions are
present :
a) current limiting region ; the DC impedance of the
SLIC is very high (> 20 Kohm) and therefore the
systemworkslike a currentgenerator,the current
value being set through the digital interface
(25/30/45/70mA).
b) standard feeding system region ; the
characteristic is equal to a – 48V (– 60V) battery
(note 1), in series with two resistors, whose value
is set by external components (see external
component list of L3030).
c) low impedance region ; the battery value is
reducedto 33V (45V) and the serial resistance is
reduced to the value specified in stand by mode,
that
is
:
2
3
x
(RFS
+
2RP)
Switching betweenthe three region is automaticwi-
thout discontinuity, and depends on the loop resi-
stance.Fig. 2 shows the DC characteristic in normal
battery condition.
Whenthe boostbatteryconditionisactivatedthe low
impedance region can never be reached by the sy-
Figure 2 : DC Characteristic (n.b.) ILIM = 25/30/45/70mA.
Note :
8/29
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 voltage drop in the low impedance region is 15V. It is also possible to increase up to 25V this value setting BIT3R to 1.







L3000S equivalent, schematic
L3000S - L3030
EXTERNAL COMPONENT LIST FOR THE LINE INTERFACE
Pin
Ref.
L3000S
10 RREF
1,15 RP
7 CDVB
3 CVB+
8 CVB–
8 D1
L3030 (PLCC44)
4-3 CVSS
5-3 CVDD
7-8 RR
15-17
RDC
7-15
CAC1 (3)
14-15
8-9
8-9
9-14
2-3
36-3
36-41
CAC2
ZAC
CCOMP
RPC
RREF
ZB
ZL
32-3
15-16
35
CINT
Ccon
TTx FILT.
34 RGTTX
Component
Value
Involved Parameter or Function
24.9k± 1%
30 to 100
47µF – 20V
0.1µF – 100V (1)
0.1µF – 100V (2)
BAT 49X
Bias Resistance
Line Series Resistor
Battery Voltage Rejection
Positive Battery Filter
Negative Battery Filter
Protective Shottky Diode
0.1µF – 15V
0.1µF – 15V
16K(range: 10 to 50KΩ)
2 x (RFS – RP1)
1
6.28 x 250 x (ZAC+ RDC)
CAC1
ZML – (RP1 + RP2)
1/(6.28 x 150000 x (RPC))
RP1 + RP2
24.9K1%
K x Zline (note 4)
K x RPC in Series with
K x ZAC // (CCOMP/K)
(note 6)
0.15µF (note 7)
ZTTX = 1k1% in speech band
ZTTX 0at TTX freq. (note 9)
10k1%
Negative Supply Voltage Filter
Positive Supply Voltage Filter
Capacitor Multiplier Gain (8)
DC Feeding Resistor (RDC > 270)
AC Path decoupling
2 Wire AC impedance
AC loop compensation
Rp insertion loss compensation
Bias Resistance
Line Impedance Balancing Network
SLIC Impedance Balancing Network (note 5)
Ring trip detection time constant
Interface Time Constant
Teletax filter.
Teletax filter.
Notes :
1. In case l ine cards wi th less than 7 subscri bers are i mplemented CVB – capaci tor should be equal to 680nF/N where
N is the number of subscriber per card.
2. This shot tky diode or equivalent is necessar y to avoid to damage to t he devi ce dur ing hot insertion or in all t hose
cases when a proper power up sequence cannot be guaranteed.
In case the shottky di ode i s not impl emented the power sequence should guarantee that V B+ is always the last
supply appl ied at pow er on and t he fi rst removed at power off.
In case an ot her shot tky diode type i s adopted it must fulf il l the foll owing character isti cs:
VF < 450mV @ IF = n 15mA, Tamb = 25°C
VF < 350mV @ IF = n 15mA, Tamb = 50°C (TjL 300 0 = 90°C)
VF < 245mV @ IF = n 15mA, Tamb = 85°C (TjL 300 0 = 120°C )
Where n is the number of line sharing the same diode.
3. If the internal capacit y mul tipli er stage i s not used, pin 7 must be connect ed w ith pin 14 without mounting R R and
CAC 2. In thi s case C AC1 = 1/(6.28 x 30 x RD C).
4. The str ucture of thi s network shall copy the line impedance, in case mul tiplied by a factor K = 1....10
5. K as fixed at note 4.
6. CINT can have the f ollowi ng values :
Fr. (Hz) 16/18
18/21
21/26
26/31
31/38
38/46
46/57
57/66
CINT (nF) 560 470 390 330 270 220 180 150
7. Ccon is necessary to w ork ”w it hout on/off hook det ection- error s” during T TX-pul ses.
8. RR is used by a capaci tor multiplier ci rcuit to synthetize an hi gher AC /DC split ting capacit or st arti ng from CA C1
9.
and CAC2. Supposing CAC1 = CAC2 = CAC the synthetized capacitor value
If Teletax is not used t he T TX F ILT. can be r eplaced by a 1kresi stor.
will be equal
R
R + ZML
ZML
CA
C
.
16/29










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