L3000 datasheet(6/29 Pages) STMICROELECTRONICS

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ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Vb–

Negative Battery Voltage

– 80

Vb+

Positive Battery Voltage

|Vb–| + |Vb+|

Total Battery Voltage

140

Vdd

Positive Supply Voltage

+ 6

Vss

Negative Supply Voltage

– 6

Vagnd –Vbgnd

Max. Voltage between Analog Ground and Battery Ground

Max. Junction Temperature

+ 150

°C

Tstg

Storage Temperature

– 55 to + 150

°C

OPERATING RANGE

Symbol

Parameter

Min.

Typ.

Max.

Unit

Toper

Operating Temperature Range

°C

Vb–

Negative Battery Voltage

– 70

– 48

– 24

Vb+

Positive Battery Voltage

+ 72

+ 75

Vb–+ Vb+

Total Battery Voltage

120

130

Vdd

Positive Supply Voltage

+ 4.5

+ 5.5

Vss

Negative Supply Voltage

– 5.5

– 4.5

Imax

Total Line Current (IL + IT)

THERMAL DATA

Symbol

Parameter

Value

Unit

L3000S HIGH VOLTAGE

Flexiwatt

PWSO20

Rth j-case

Thermal Resistance Junction to Case

Max. 4

Typ. 2

°C/W

Rth j-amb

Thermal Resistance Junction to Ambient

Max. 50

Max. 60

°C/W

L3030 LOW VOLTAGE

Rth j-amb

Max. Resistance Junction to Ambient

°C/W

FUNCTIONAL DESCRIPTION

L3000S - High Voltage Circuit

The L3000Slineinterfaceprovides a batteryfeeding

for telephonelines and ringing injection. The IC con-

tains a state decoderthat underexternal control can

force the following operational modes : stand-by,

conversation and ringing.

In addition Power down mode can be forced con-

necting the bias current resistor to VDD or leaving it

open.

Two pins, IL andIT, carryout the information concer-

ning line statuswhich is detectedby sensing the line

current into the output stage.

The L3000S amplifies both the AC and DC signals

entering at pin 6 (VIN) by a factor equal to 40.

Separate grounds are provided :

- Analog ground as a reference for analog signals

- Battery ground as a reference for the output sta-

ges

The two ground should be shorted togetherat a low

impedance point.

L3030 - Control Unit

The L3030 low voltage control unit controls L3000S

line interface module, giving the proper information

to set line feed characteristic, to inject ringing and

TTX signal and synthetizes the line and balance im-

pedances. An on chip digital interface allows a mi-

croprocessor to control all the operations. L3030

defines working states of line interface and also in-

forms the card controller about line status.

L3000S - Working States

In order to carry out the different possible opera-

tions, the L3000S has several different working sta-

tes.Each stateis definedby the voltagerespectively

applied by pins 27 and 28 of L3030 to the pins 11

and 12 of L3000S.

Three different voltage levels (– 3, 0, + 3) are avai-

lable at each connection, so defining nine possible

L3000S - L3030

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