V.23 Compatible Modem

FX604

© 1996 Consumer Microcircuits Limited

2

D/604/3

CONTENTS

Section

Page

1.0 Features......................................................................................................1

1.1 Brief Description ........................................................................................1

1.2 Block Diagram ............................................................................................3

1.3 Signal List ..................................................................................................3

1.4 External Components ................................................................................5

1.5 General Description ...................................................................................5

1.5.1 Xtal Osc and Clock Dividers .........................................................5

1.5.2 Mode Control Logic.......................................................................6

1.5.3 Rx Input Amplifier .........................................................................6

1.5.4 Receive Filter and Equaliser .........................................................6

1.5.5 Energy Detector ...........................................................................7

1.5.6 FSK Demodulator .........................................................................7

1.5.7 FSK Modulator and Transmit Filter ...............................................7

1.5.8 Rx Data Retiming .........................................................................9

1.5.9 Tx Data Retiming........................................................................10

1.6 Application Notes ....................................................................................12

1.6.1 Line Interface..............................................................................12

1.7 Performance Specification ......................................................................13

1.7.1 Electrical Performance................................................................13

1.7.2 Packaging ..................................................................................16