CMX838 查看數據表（PDF） - CML Microsystems Plc
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CMX838 Datasheet PDF : 71 Pages
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FRS/PMR446/GMRS Family Radio Processor
CMX838
5.1.2.5 AUDIO POWER AND BANDWIDTH CONTROL Register ($83) ....................................34
5.1.2.6 TXMOD 1 & 2 CONTROL Register ($88) .......................................................................35
5.1.2.7 SYNTHESIZER BASEBAND CLK CONTROL Register ($89)........................................37
5.1.2.8 SYNTHESIZER GENERAL CONTROL Register ($8A)..................................................38
5.1.2.9 SYNTHESIZER CHANNEL SELECT Register ($8B) .....................................................39
5.1.2.10 SYNTHESIZER STATUS Register ($8C) .......................................................................39
5.1.2.11 SYNTHESIZER 1ST IF OFFSET Register ($8D) ...........................................................40
5.1.2.12 16 BIT SUBAUDIO TASK DATA Register ($8E) ............................................................40
5.1.2.13 16 BIT SUBAUDIO TEST DATA Register ($8F).............................................................40
5.1.2.14 SYNTHESIZER TEST Register ($90) .............................................................................40
5.1.2.15 16 BIT SUBAUDIO TEST READ DATA Register ($91) ..................................................41
5.1.2.16 TONE SIGNALING CONTROL Register ($93) ...............................................................41
5.1.2.17 SUBAUDIO STATUS Register ($94) ..............................................................................42
5.1.2.18 8 BIT SUBAUDIO TASK DATA Register ($95)...............................................................42
5.1.2.19 SUBAUDIO ANALOG CONTROL Register ($97)...........................................................43
6 Application Notes ........................................................................................................45
6.1 Overview ......................................................................................................................... 45
6.2 Basic FRS Radio Architecture ......................................................................................... 46
6.3 CMX838 Architectural Overview ...................................................................................... 47
6.4 Detailed CMX838 Architecture......................................................................................... 47
6.4.1 Audio Processing...................................................................................................................48
6.4.2 Tone Signaling Processor .....................................................................................................50
6.4.3 Level Control .........................................................................................................................52
6.4.4 Synthesizer and Charge Pump .............................................................................................54
6.4.5 Clock Generation...................................................................................................................54
6.4.6 Powersave Functions ............................................................................................................55
6.5 Control Registers Illustrated............................................................................................. 55
6.6 Application Examples ...................................................................................................... 58
6.6.1 CMX838 Initialization.............................................................................................................58
6.6.1.1 Register Descriptions: .....................................................................................................58
6.6.2 TX, subaudio encoding, single point modulation...................................................................58
6.6.2.1 Register Descriptions: .....................................................................................................59
6.6.3 RX, subaudio decode CTCSS tone or tones.........................................................................60
6.6.3.1 Register Descriptions: .....................................................................................................60
6.6.4 RX, multiple subaudio tone detect - Tone Cloning™ ............................................................62
6.6.4.1 Register Descriptions: .....................................................................................................62
7 Performance Specification..........................................................................................64
7.1 Electrical Performance..................................................................................................... 64
7.1.1 Absolute Maximum Ratings...................................................................................................64
7.1.2 Operating Limits ....................................................................................................................64
7.1.3 Operating Characteristics ......................................................................................................65
7.1.4 Timing....................................................................................................................................68
7.2 Packaging........................................................................................................................ 70
2003 CML Microsystems Plc
3
D/838/8
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