ADM Codec
CMX649
Section
CONTENTS
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
© 2003 CML Microsystems Plc
2
D/649/2