ADM Codec

CMX649

© 2003 CML Microsystems Plc

2

D/649/2

CONTENTS

Section

Page

1.

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

2.

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

3.

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

4.

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

5.

General Description............................................................................. 6

5.1

Block Descriptions.................................................................. 6

5.1.1

ADM Coding Engine ................................................... 6

5.1.2

PCM Encoding and Decoding.................................... 7

5.1.3

Transcoding with the Encoder and Decoder ............ 8

5.1.4

Non-Linear Instantaneous Companding ................... 9

5.1.5

Digitally Controlled Amplifiers................................... 9

5.1.6

Microphone Amplifier................................................. 9

5.1.7

Programmable Anti-alias/image SC Filters ............... 9

5.1.8

Data Clock Recovery ................................................ 11

5.1.9

Data Scrambler/De-scrambler .................................. 11

5.1.10 Voice Activity Detector (VAD) .................................. 12

5.2

C-BUS Description ................................................................ 13

5.2.1

Write Only Register Description .............................. 16

5.2.2

Read Only Register Description .............................. 35

6.

Application Notes .............................................................................. 37

6.1

C-BUS Operation................................................................... 37

6.2

CODEC Data Interface........................................................... 38

6.3

Example CODEC Setups and Application Help................... 39

7.

Performance Specification................................................................ 44

7.1

Electrical Performance.......................................................... 44

7.2

Packaging.............................................................................. 49