ST L3234, L3235N User Manual

查询L3235N 供应商

L3234

®

HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX

AND KEY SYSTEM APPLICATIONS

HIGHLY INTEGRATED SUBSCRIBER LINE INTERFACE KIT FOR PABX AND KEY SYSTEM APPLICATIONS

IMPLE MENTS AL L KEY ELEMEN TS OF T HE BORSCHT FUNCTION

INTEGRATED ZERO CROSSING BA LANCED RINGING INJECTION ELIMINATES EXTERNAL RELAY AND CENTRALISED RINGING GENERATOR

ZERO NOISE INJECTED ON ADJACENT LINES DURING RINGING SEQUENCE

LOW POWER IN STANDBY AND ACTIVE MODES

BATTERY FEED WITH PROGRAMMABLE LIMITING CURRENT

PARALLEL LATCHED DIGITAL INTERFACE SIGNALLING FUNCTIONS (OFF HOOK,

GND-KEY) LOW NUMBER OF EXTERNAL COMPO-

NENTS INTEGRATED THERMAL PROTECTI ON INTEGRATED OVER CURRENT PROTEC-

TION 0°C TO 70°C: L3234/L3235N

-40°C TO 85°C: L3234T/L3235NT

DESCRIPTION

The L3234/L3235N is a highly integrated SLIC KIT targeted to PABX and key system applications

The kit integrates the majority of functions required to interface a telephone line. The L3234/L3235N implements the main features of the broths function:

- Battery Feed (Balanced Mode)

- Ringing Injection

- Signalling Detection

- Hybrid Function

L3235N

HEPTAWATT

ORDERING NUMBER:

TQFP44

ORDERING NUMBER:

The Kit comprises 2 devices, the L3234 ringing injector fabricated in Bipolar in 140V Technology.

Its function is to amplify and inject in balanced mode with zero crossing the ringing signal. The device requires an external positive supply of 100V and a low level sinusoid of approx. 950mVrms. The L3235N Line Feeder is integrated in 60V Bipolar Technology. The L3235N provides battery feed to the line with programmable current limitation. The two to four wire voice frequency signal conversion is implemented by the L3235N and line terminating and balance impedances are externally programmable. The L3234/L3235N kit is designed for low power dissipation. In a short loop condition the extra power is dissipated on an external transistor. The Kit is controlled by five wire parallel bus and interfaces easily to all the STLC5046 and STLC5048 CODECs. In Kit with STLC5048 (see fig 1) the line impedance synthesis and echo canceling are performed inside the CODEC.

L3234

L3235N

December 2001

1/25

L3234 - L3235N

ABS TYPICAL LINE CARD APPLICATION

CC

V

GND

V100

10µF

82Ω

10µF

5

7

0.1µF0.1µF

L3234

2

63

1

4

VA

GND

CS

CAC

CS

29

D1

CAC

100µF

IL

6

18

4.7µF 7

43

ZAC

VRING

ZS=4100Ω

DD

V

0.1µF

DD

V

VSSSUB

CC

V

CC

0.1µF

V

20Ω

P2

R

1N4007

30Ω

TIP

11

ZA

TIP

38

PROTECTION

OVERVOLTAGE

RT

1MΩ

D2

1N4007

P1

R

30Ω

RING

10

12

ZB

RX

100K

100µF

VFRO0

RING

20Ω

P2

R

P1

R

40

L3235N

9

TX

VFXI0

TEXT

VREG

BASE

44

22

31

OH

RNG

CTX 100nF

IO0

IO1

MJE350

V

RTF

25

27

SBY

IO2

BAT

VPOL

34

28

PUNEG

IO3

LIM

20

32

GDK

IO4

REF

GKF

241435

3

13

CC

V

BGND

BAT

AGND V

17239

SS

V

IO11

IO12(CS0)

RF

39K

CF

390nF

CR

4.7µF

9.1K

RLIM

RR

51K

39K

RGF

CGF

390nF

CVSS CVB

IO13(CS1)

IO14(CS2)

to 35K

0.1µF0.1µF

CVCC

IO15(CS3)

VFRO1

BAT

V

SS

V

0.1µF

CC

V

VFXI1

VFRO2

VFXI2

VFRO3

VFXI3

D98TL381

2/25

TSX

STLC5048

INT

RES

CS

CO

CCLK

SERIAL

CONTROL

CI

PORTS

EE

V

GND V

DX

DR

FS

MCLK

L3234

Solid State Ringing Injector

DESCRIPTION

The L3234 is a monolithic integrat ed circuit which is part of a kit of solid state devices for the subscriber line interface. The L3234 sends a ringing signal into a two wires analog telephone line in balanced mode. The AC ringing signal amplitude is up t o 60Vrms, and for that purpose a positive supply voltage of +100V shall be available on the subscriber card.

The L3234 receives a low amplitude ringing signal (950mVrms) and provide the voltage/current amplification (60Vrms/70mA) when the enable input is active (CS

0.8V) the power consumption of the chip is very low (<14mW).

The circuit is designed with a high voltage bipolar technology (V

> 2V). In disable mode (CS <

> 140V / V

CEO

> 250V).

CBO

L3234 - L3235N

HEPTAWATT

The package is a moulded plastic power package (Heptawatt) suitable also for surface mounting.

BLOCK DIAGRAM

3/25

L3234 - L3235N

PIN CONNECTION (Top view)

7 6 5 4 3 2 1

D94TL131

OUT2 V100 OUT1 GND VCC CS VA

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V100 Positive Power Supply Voltage +120 V

V

CS Logical Ring Drive Input V

T

5V Power Supply Voltage 5.5 V

CC

Low Voltage Ringing Signal (with V100 = 120Vdc) 1.4 Vrms

A

CC

Max. Junction Temperature 150

j

Storage Temperature -55 to +150

stg

OPERATING RANGE

Symbol Parameter Value Unit

V100 High Power Supply Voltage 95 to 105 V

V

T

Low Power Supply Voltage 5 ±5% V

CC

Low Voltage Ringing Signal

A

Operating Temperature for

op

Max. Junction Operating Temperature (due to thermal protection) 130

jop

L3234

600 to 950

within 10Hz - 100Hz

0 to 70

o

C

o

C

Vrms

C

°

C

°

Note:

Operating ranges define those limits between which the functionality of the device is guaranteed.

THERMAL DATA

Symbol Description Value Unit

R

th j-case

R

th j-amb

Thermal Resistance Junction-case Thermal Resistance Junction-ambient

Max. Max.

4

50

PIN DESCRIPTION

Pin Name Description

1 VA Low Voltage Ringing Signal Input 2 CS Logical Ring Drive Input 3V

CC

4 GND Common Analog-Digital Ground 5 OUT1 Ringing Signal Output 6 V100 +100V High Power Supply 7 OUT2 Ringing Signal Output in Opposite Phase with Out1

4/25

+5V Low Power Supply

o

C/W

o

C/W

L3234 - L3235N

OPERATION DESCRIPTION

The Fig. 1 show the simplified circuit configuration

Figure 1: L3234/L3235N Circuit Configuration

TIP

A

LINE TERMINALS

RING

LINE FEEDER

CO1

CO2

B

L3235N

of the L3234 Solid State Ringing injector when used with the L3235N Line Feeder.

+5VGND+100V

C100 CVCC

VCCGNDV100

RO1

OUT1

RO2

OUT2

CS

GND

-VBAT

643

5

RINGING INJECTOR

7

L3234

2

1

VA

CA

D94TL-L3235N

VA

EXTERNAL COMPONENTS LIST

In the following table are shown the recommended external components values for L3234.

Ref. Value Involved Parameter or Function

R01, R02 82 C01, C02 10µF - 160V Ringing Feeding De coupling Capacitors

CA 4.7µF - 10V Low Level Ringing Signal De coupling Capacitor C100 100nF - 100V Positive Battery Filter CV

CC

Ω

100nF +5V Supply Filter

When the ringing function is selected by the subscriber card, a lo w level sig nal is contin uously applied to pin 1 t hr o ugh a de cou pling ca pacitor . T h en the logical rin g drive sign al CS provide d by L3235N is applied to pin 2 with a cadenced mode.

The rin ging cycles a re synchronis ed by the L3234 in such a way that the r inging start s and stops always when the analog input signal crosses zero.

When the ringing injection is enabled (CS = "1"), an AC ringing signal is injected in a balanced

Ringing Feeding Series Resistors

mode into the telephone line. When the ringing injection is disabled (CS = "0"),

the output voltage on OUT2 raises to the high power supply, whereas on OUT1, it falls down to ground.

The L3234 has a low output impedance when sending the signal, and high output impedance when the ringing signal is disabled

In fig. 2 the dynamic features of L3234 are shown.

5/25

L3234 - L3235N

Figure 2: Dynamic Features of L3234

DATA TRANSMISSION INTERFERENCE TEST

The L3234 meet the requirements of the technical specification ST/PAA/TPA/STP/1063 from the CNET. The test circuit used is indicated below.

The measured error rate for data transmission is lower than 10

This test measures if during the ringing phase the circuit induce any noise to the closer lines.

Figure 3: Test Circuit Data Transmission Interference Test

-6

during the ringing phase.

6/25

L3234 - L3235N

ELECTRICA L CHARA CTERI STI CS (Test conditions: V100 = +100V, V

= +5V, T

CC

= 25°C, unless oth-

amb

erwis e s pecifi ed) Note: Testing of all parameter is performed at 25°C. Characterisation, as well as the design rule used al-

low correlation of tested performance with actual performances at other temperatures. All parameters listed here are met in the range 0°C to +70°C.

Symbol Parameter Test Condition Min. Typ. Max. Unit Fig

STAND BY MODE: CS = "0"

IS (V100)

I

(VCC)

S

V

SOUT1

V

SOUT2

Z

SOUT1

Z

SOUT2

THD Harmonic Distortion During

Consumption VA = 950mVrms; 50Hz 45

560

100 800

DC Output Voltage VA = 950mVrms; 50Hz

92

Output Impedance 70

70

Z

Matching 15 %

OUT

< 6dBm; f = 1kHz -46 -40 dB 5

V

LINE

Emission

A

µ

A

µ

6V

V

k

Ω

k

Ω

4

RINGING PHASE: CS = "1" DC OPERATION

IR (V100)

I

(VCC)

R

V

ROUT1

V

ROUT2

V

IH

IIH (CS = 0)

V

IL

IIL (CS = 0)

I

lim

Consumption Z

DC Output Voltage VA = 0V 44

Threshold Voltage on the Logical Input CS

DC Line Current Limitation VA = 0V 70 150 mA 12

=

∞

LINE

VA = 950mVrms; 50Hz

44

VA = 950mVrms; 50Hz 2.0

2.5

2.2

5 3

56 56

1

0.8 1

mA mA

V V

V

µ

V

µ

A

6

A

AC OPERATION

V

/VA

OUT1

V

/VA

OUT2

V

OUT1 -VOUT1

Ringing Gain Z

Ringing Signal ZLINE = 2.2µF + 1k

= 2.2µF + 1k

LINE

VA = 0dBm

Ω

29.5

Ω

57 60 Vrms

30 30

VA = 950mVrms; 50Hz

THD V

(VA) Input Impedance VA = 950mVrms; 50Hz 40 k

Z

IN

Z

OUT

Harmonic Distortion VA = 950mVrms; 50Hz 5 %

LINE

Differential Output Impedance I

< 50mArms 20

LINE

TEST CIRCUITS Figure 4.

dB dB

Ω

7

Ω

8 9

7/25

L3234 - L3235N

TEST CIRCUITS (continued) Figure 5.

VCC V100

Figure 6.

4.7µF

CS

2

1

L3234

4

GND

D94TL133

VOUT2

63

7

VOUT1 A

5

82Ω

10µF/160V

-VBAT

LINE FEEDER

1MΩ

B

V

ZLINE=600Ω

VE 1KHz

Figure 7.

8/25