L3000S 查看數據表（PDF） - STMicroelectronics

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L3000S

SUBSCRIBER LINE INTERFACE KIT

STMicroelectronics 

L3000S - L3030

ABSOLUTE MAXIMUM RATINGS

Symbol

Vb–

Vb+

|Vb–| + |Vb+|

Vd d

Vss

Vagnd – Vbgnd

Tj

Tstg

Parameter

Negative Battery Voltage

Positive Battery Voltage

Total Battery Voltage

Positive Supply Voltage

Negative Supply Voltage

Max. Voltage between Analog Ground and Battery Ground

Max. Junction Temperature

Storage Temperature

Value

Unit

– 80

V

80

V

140

V

+6

V

–6

V

5

V

+ 150

°C

– 55 to + 150

°C

THERMAL DATA

Symbol

Parameter

L3000S HIGH VOLTAGE

Rth j-case

Rth j-amb

Thermal Resistance Junction to Case

Thermal Resistance Junction to Ambient

L3030 LOW VOLTAGE

Rth j-amb Max. Resistance Junction to Ambient

Value

Flexiwatt PWSO20

Max. 4

Typ. 2

Max. 50 Max. 60

Unit

°C/W

°C/W

80

°C/W

OPERATING RANGE

Symbol

Toper

Vb–

Vb+

Vb– + Vb+

Vdd

Vss

Imax

Parameter

Operating Temperature Range

Negative Battery Voltage

Positive Battery Voltage

Total Battery Voltage

Positive Supply Voltage

Negative Supply Voltage

Total Line Current (IL + IT)

Min. Typ. Max. Unit

0

70

°C

– 70 – 48 – 24

V

0

+ 72 + 75

V

120 130

V

+ 4.5

+ 5.5 V

– 5.5

– 4.5 V

85

mA

FUNCTIONAL DESCRIPTION

L3000S - High Voltage Circuit

The L3000Slineinterfaceprovidesa batteryfeeding

for telephonelines and ringing injection.The IC con-

tains a state decoderthat underexternal controlcan

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 groundshould be shortedtogetherat 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

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