MOS switch.

The self generated battery voltage tracks the line

resistance. In this way the power dissipation in-

side the device is low enough to allow the use of

small SMD package (TQFP44).

Other useful characteristics for application in the

WLL environment are the integrated ringing gen-

erator and the dual two wire port that allows to

drive two different terminal equipment whether

the transmission is voice or data. When one port

is transmitting the other one is idle.

The control interface is a parallel type with open

drain output and 3.3V logic levels.

The metering pulses are generated on chip start-

ing from two logic signals (0, 3.3V) one defines

the metering pulse frequency and the other the

metering pulse duration. An on chip circuit then

provides the proper shaping and filtering.

Metering pulse amplitude and shaping (rising and

decay time) can be programmed by external com-

ponents. A dedicated cancellation circuit avoid

possible CODEC input saturation due to Metering

pulse echo.

Constant current feed can be set from 20mA to

40mA.

Off-hook detection threshold is programmable

from 5mA to 9mA.

The device, developed in BCD100II technology

(100V process), operates in the extended tem-

perature range and integrates a thermal protec-

tion that set the device in power down when Tj

exceeds 140

°C.

1

2

3

5

6

4

7

8

9

10

17

11

18

19

20

21

22

44

43

42

41

39

40

38

37

36

35

34

28

27

26

24

23

25

33

32

31

29

30

DET1

P2

P1

D1

D0

D2

CTTX2

CTTX1

CKTTX

DET2

DET

RLIM

AGND

CVCC

RSENSE

GATE

VPOS

CSVR

ILTF

RD

IREF

RTH

D96TL273B

12

13

14

15

16

PIN CONNECTION

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Positive Supply Voltage

-0.4 to +17

V

A/BGND

AGND to BGND

-1 to +1

V

Pin D0, D1, D2, P1, P2, DET, DET1, DET2 CKTTX

-0.4 to 5.5

V

Max. junction Temperature

150

°C

(1)

Vbtot=|Vpos|+|Vbat|. (Total voltage applied to the device

supply pins).

100

V

(1) Vbat is self generated by the on chip DC/DC converter and can be programmed via RF1 and RF2.

RF1 and RF2 shall be selected in order to fulfil the a.m limits (see External Components Table page 13)

DESCRIPTION (continued)

STLC3065

2/27