ISDN TA POTS Interface

CMX625

 2001 Consumer Microcircuits Limited

2

D/625/2

CONTENTS

Section

Page

1.1

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

1.2

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

1.3

Signal List ................................................................................................ 4

1.4

External Components ............................................................................. 6

1.5

General Description ................................................................................ 7

1.5.1

IOM™-2 Serial Bus Interface ..................................................... 7

1.5.2

Terminal Mode (TE).................................................................... 8

1.5.3

Non-Terminal Mode (non-TE) ................................................. 10

1.5.4

Monitor Channel Handshake Protocol................................... 11

1.5.5

Monitor Channel Identification Command ............................ 13

1.5.6

PCM Codec-Filter ..................................................................... 13

1.5.7

Rx Input Amplifier .................................................................... 14

1.5.8

Tx Output Buffer ...................................................................... 14

1.5.9

Tone/FSK Encoder and Tone Encoder .................................. 14

1.5.10 SPM Generator ......................................................................... 17

1.5.11 Transmit Signal Control .......................................................... 17

1.5.12 Tx UART .................................................................................... 18

1.5.13 DTMF Tone Decoder ................................................................ 19

1.5.14 Register Set .............................................................................. 20

1.5.15 Programming the CMX625 ...................................................... 20

1.5.16 Glossary .................................................................................... 22

1.6

Application Notes.................................................................................. 23

1.6.1

Telecom Tones ......................................................................... 23

1.7

Performance Specification................................................................... 27

1.7.1

Electrical Performance ............................................................ 27

1.7.2

Packaging ................................................................................. 33