CMX649E3 CML Microcircuits, CMX649E3 Datasheet - Page 2

• Manufacturer Part Number: CMX649E3
• Description: ADM Codec
• Manufacturer: CML Microcircuits

ADM Codec
The CMX649 ADM Voice Codec supports 2.7V to 5.5V operation and is available in 20-pin SOIC (D3)
and TSSOP (E3) packages.
Note: This product is in development: Changes and additions will be made to this
2002 CML Microsystems Plc
Section
1.
2.
3.
4.
5.
6.
7.
specification. Items marked TBD or left blank will be included in later issues.
Information in this data sheet should not be relied upon for final product design.
Brief Description.................................................................................. 1
Block Diagram ..................................................................................... 3
Signal List ............................................................................................ 4
External Components.......................................................................... 5
General Description............................................................................. 6
5.1
5.2
Application Notes .............................................................................. 39
6.1
6.2
6.3
Performance Specification................................................................ 47
7.1
7.2
Block Descriptions.................................................................. 6
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.1.8
5.1.9
5.1.10 Voice Activity Detector (VAD) .................................. 12
C-BUS Description ................................................................ 14
5.2.1
5.2.2
C-BUS Operation................................................................... 39
CODEC Data Interface........................................................... 40
Example CODEC Setups and Application Help................... 41
6.3.1
6.3.2
Electrical Performance.......................................................... 47
Packaging.............................................................................. 51
ADM Coding Engine ................................................... 6
PCM Encoding and Decoding.................................... 7
Transcoding with the Encoder and Decoder ............ 8
Non-Linear Instantaneous Companding ................... 9
Digitally Controlled Amplifiers................................... 9
Microphone Amplifier................................................. 9
Programmable Anti-alias/image SC Filters ............. 11
Data Clock Recovery ................................................ 11
Data Scrambler/De-scrambler .................................. 12
Write Only Register Description .............................. 17
Read Only Register Description .............................. 36
32kbps ADM with clock and data recovery ............. 44
64kbps burst mode Bluetooth CVSD....................... 45
CONTENTS
2
Page
CMX649
D/649/1