L3000S 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

L3000S

SUBSCRIBER LINE INTERFACE KIT

STMicroelectronics 

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

24.9kΩ ± 1%

30 to 100Ω

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

16KΩ (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

24.9KΩ 1%

K x Zline (note 4)

K x RPC in Series with

K x ZAC // (CCOMP/K)

(note 6)

0.15µF (note 7)

ZTTX = 1kΩ 1% in speech band

ZTTX ≈ 0Ω at TTX freq. (note 9)

10kΩ 1%

Negative Supply Voltage Filter

Positive Supply Voltage Filter

Capacitor Multiplier Gain (8)

DC Feeding Resistor (RDC > 270Ω)

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 1kΩ resi stor.

will be equal

R

R + ZML

ZML

⋅

CA

C

.

16/29

Share Link: