PIN DESCRIPTION

Unless otherwise specified all the diagrams in this datasheet refers to the PLCC44 Pin Connection.

PQFP44

No.

PLCC44

No.

Pin

Description

39

1

Positive Power Supply (+5V)

40

2

41

3

RDC

42

4

CF

43

5

BASE

Driver for external transistor base

44

6

BGND

Battery ground

2

7

VREG

Regulated Voltage. Provides negative power supply for the power amplifier.

(connected to emitter of the external transistor.)

3

8

STIP

Input of A power amplifier (when no compensation of ext. ptc resistor mismatch is

requested it must be shorted to the TIP lead).

4

9

TIP

1, 28

10 to 14

32 to 36

VB

Battery Supply

PLCC44: All pins are internally connected together.

PQFP44: It is mandatory to short pin 1 and pin 28 as closed as possible to the device.

8

15

RING

9

16

SRING

Input of B power amplifier (when no compensation of ext. ptc resistor mismatch is

requested it must be shorted to the RING lead).

11

17

CRT

Ring trip and ground key capacitor

12

18

ODET

ON/OFF hook and RING TRIP output (when disable is internally pulled up)

13

19

RGIN

Ring input signal. (when open is internally pulled to GND)

14

20

OGK

Ground key output (when disable is internally pulled up)

15

21

GST

A open command (when open is internally pulled down)

16

22

D1

Bit 1

17

23

D0

Bit 0

18

24

LIM

Current Limitation Program. (when open is internally forced to 44mA current limitation)

19

25

Negative Power Supply (-5V)

20

26

REL

Ring relay driver output

21

27

CREV

Reverse polarity transition time control. One proper capacitor connected between this

pin and AGND is setting the reverse polarity transition time. If reverse polarity feature

is not used must be open or connected to AGND through a filter capacitor.

22

28

GREL

Ground reference for ring relay driver

23

29

AC feedback input (ACDC split capacitor is connected from this node to ILTF)

24

30

Protection resistors image (the image resistor is connected from this node to ACFD)

25

31

30

37

Tx

4 wire output port (Tx output)

31

38

Rx

4 wire receiving port. (Rx input)

32

39

Rx buffer output (the AC impedance is connected from this node to ACFD)

33

40

TTXIN

34

41

RTTX

Metering cancellation network. If not used should be left open.

35

42

ACFD

AC impedance synthesis

37

43

AGND

DC and AC signal ground

38

44

Voltage Reference Output

2,5 to 7,

10,26,

27, 29,36

–

N.C.

Not connected

L3037

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