CMX138 CML Microcircuits, CMX138 Datasheet - Page 2

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
© 2008 CML Microsystems Plc
Section
1
2
3
4
5
6
7
8
9
Brief Description.....................................................................................................................1
History .....................................................................................................................................5
Block Diagram ........................................................................................................................6
Signal List................................................................................................................................7
External Components ............................................................................................................9
5.1
General Description .............................................................................................................12
Detailed Descriptions...........................................................................................................13
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
C-BUS Register Summary ...................................................................................................35
Configuration Guide.............................................................................................................37
9.1
7.2.1
7.3.1
7.3.2
7.4.1
7.4.2
7.4.3
7.5.1
7.5.2
7.5.3
7.5.4
7.6.1
7.6.2
7.9.1
7.9.2
7.11.1 Transmit Path Levels ..........................................................................................34
7.11.2 Receive Path Levels ...........................................................................................34
8.1.1
8.1.2
PCB Layout Guidelines and Power Supply Decoupling............................................11
Xtal Frequency ..........................................................................................................13
Host Interface ............................................................................................................13
Device Control ...........................................................................................................15
Audio Functions.........................................................................................................17
Sub-audio Signalling..................................................................................................24
In-band Signalling – User Tones ...............................................................................29
Auxiliary ADC Operation ...........................................................................................30
Auxiliary DAC/RAMDAC Operation...........................................................................31
Digital System Clock Generator ................................................................................32
GPIO..........................................................................................................................34
Signal Level Optimisation ..........................................................................................34
C-BUS Register Details.............................................................................................37
C-BUS Operation.................................................................................................13
Signal Routing .....................................................................................................15
Mode Control .......................................................................................................16
Audio Receive Mode ...........................................................................................17
Audio Transmit Mode ..........................................................................................19
Audio Compandor................................................................................................22
Receiving and Decoding CTCSS Tones .............................................................26
Receiving and Decoding DCS Codes .................................................................27
Transmit CTCSS Tone ........................................................................................29
Transmit DCS Code ............................................................................................29
Receiving and Decoding In-band Tone ...............................................................29
Transmitting In-band Tone ..................................................................................30
Main Clock Operation ..........................................................................................32
System Clock Operation......................................................................................33
Interrupt Operation ..............................................................................................36
General Notes .....................................................................................................36
CONTENTS
Page 2
D/138_FI1.0/5
CMX138
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