STLC3075

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2 DESCRIPTION (continued)

The battery level is properly adjusted depending on the operating mode. A useful characteristic for these

applications is the integrated ringing generator.

The control interface is a parallel type with open drain output and 3.3V logic levels.

The metering pulses are generated on chip starting from two logic signals (0, 3.3V) one define the meter-

ing 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 components.

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 BCDIIIS technology (90V process), operates in the extended temperature range

Figure 3. Pin Connection

Table 2. Absolute Maximum Ratings

(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)

Symbol

Parameter

Value

Unit

Positive Supply Voltage

-0.4 to +13

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).

90

V

ESD

RATING

Human Body Model

±1750

V

Charged Device Model

±500

V

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.

GAIN SET

PD

D1

D0

D2

RTTX

CTTX2

CTTX1

DET

CKTTX

RLIM

AGND

CVCC

RSENSE

GATE

CLK

VPOS

ILTF

RD

IREF

RTH

D00TL488

12

13

14

15

16