1996 Dec 20

14

Philips Semiconductors

Product specification

Analog voice scrambler/descrambler

PCD4440T

10 HANDLING

Inputs and outputs are protected against electrostatic discharge in normal handling. However, it is good practice to take

normal precautions appropriate to handling MOS devices (see

“Handbook IC03, Section General, Handling MOS

devices”).

Fig.13 CT0 base unit with direct (Manchester code) data system.

handbook, full pagewidth

MGG734

RF

SECTION

MICROCONTROLLER

PCD33xxA

A/D CONVERTER

antenna

DESCRAMBLER

PCD4440T

LINE INTERFACE

TEA106x

EXPANDOR

1/2 NE577

SCRAMBLER

PCD4440T

COMPRESSOR

1/2 NE577

DETECTOR

CHARGING

CIRCUIT

DTMF

data in

data out

mod

TX

RX

RSSI

power down RX

power down TX

telephone

line

VREF