these applications is the integrated ringing gener-

ator.

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 define the

metering pulse frequency and the other the me-

tering pulse duration. An on chip circuit then pro-

vides the proper shaping and filtering. Metering

pulse amplitude and shaping (rising and decay

time) can be programmed by external compo-

nents. A dedicated cancellation circuit avoid pos-

sible CODEC input saturation due to Metering

pulse echo.

Constant current feed can be set from 20mA to

40mA. Off-hook detection threshold is program-

mable 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 sets the device in power down when Tj

exceeds 140

°C.

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, DET, 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 10)

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

N.C.

RES

PD

D1

D0

D2

CTTX2

CTTX1

CKTTX

N.C.

DET

RLIM

AGND

CVCC

RSENSE

GATE

VPOS

CSVR

ILTF

RD

IREF

RTH

D97TL279A

12

13

14

15

16

PIN CONNECTION

DESCRIPTION (continued)

STLC3055

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