L3030 STMicroelectronics, L3030 Datasheet - Page 16

• Manufacturer Part Number: L3030
• Description: SUBSCRIBER LINE INTERFACE KIT
• Manufacturer: STMicroelectronics

EXTERNAL COMPONENT LIST FOR THE LINE INTERFACE
L3000S
L3030 (PLCC44)
L3000S - L3030
Notes :
16/29
15-17
14-15
36-41
15-16
1,15
7-15
9-14
36-3
32-3
Pin
4-3
5-3
7-8
8-9
8-9
2-3
10
35
34
7
3
8
8
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
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
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
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 :
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. If Teletax is not used t he T TX F ILT. can be r eplaced by a 1k
N i s the number of subscri ber per car d.
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:
Where n i s the number of line shari ng the same diode.
CAC 2. In thi s case C AC1 = 1/(6.28 x 30 x RD C).
CINT (nF)
and CAC 2. Supposi ng CAC1 = CAC2 = CA C the synt heti zed capacitor value will be equal
Fr. (Hz)
V
V
V
F
F
F
< 450mV @ I
< 350mV @ I
< 245mV @ I
TTx FILT.
CAC1 (3)
CCOMP
CVB–
CDVB
CVDD
RREF
CVB+
CVSS
CAC2
RREF
R
CINT
Ccon
RDC
RPC
Ref.
ZAC
RR
RP
D1
ZB
ZL
GTTX
16/18
560
F
F
F
= n 15mA, T
= n 15mA, T
= n 15mA, T
Z
Z
Component
TTX
TTX
1/(6.28 x 150000 x (RPC))
16K (range: 10 to 50K
6.28
K x RPC in Series with
K x ZAC // (CCOMP/K)
= 1k
18/21
ZML – (RP1 + RP2)
470
K x Zline (note 4)
0.1 F – 100V (1)
0.1 F – 100V (2)
0
2 x (RFS – RP1)
x
0.15 F (note 7)
24.9k
250 x
0.1 F – 15V
0.1 F – 15V
47 F – 20V
RP1 + RP2
24.9K
30 to 100
amb
amb
amb
at TTX freq. (note 9)
BAT 49X
10k
(note 6)
1% in speech band
Value
CAC1
= 25 C
= 50 C (T
= 85 C (T
1
ZAC
1%
21/26
390
1%
1%
jL 30 0 0
jL 30 0 0
RDC
= 90 C)
= 120 C )
26/31
330
Bias Resistance
Line Series Resistor
Battery Voltage Rejection
Positive Battery Filter
Negative Battery Filter
Protective Shottky Diode
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.
resi stor.
31/38
270
Involved Parameter or Function
38/46
220
R R ZML
46/57
180
ZML
CA C .
57/66
150