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CMX838

FRS/PMR446/GMRS Family Radio Processor

CML Microsystems Plc 

FRS/PMR446/GMRS Family Radio Processor

CMX838

Section

CONTENTS

Page

1 Block Diagram................................................................................................................6

2 Signal List.......................................................................................................................7

3 External Components....................................................................................................9

4 General Description.....................................................................................................10

4.1 Audio ............................................................................................................................... 10

4.1.1 Digitally Controlled Amplifiers (DCA).....................................................................................10

4.1.2 Transmit Input Amplifier ........................................................................................................11

4.1.3 Audio Switched Capacitor Filters ..........................................................................................11

4.1.3.1 Pre-emphasis/Low-pass Filter.........................................................................................12

4.1.3.2 High-pass Filter ...............................................................................................................13

4.1.3.3 Deviation Limiter Low-pass Filter ....................................................................................13

4.1.4 De-emphasis .........................................................................................................................14

4.1.5 Transmit Audio Path ..............................................................................................................14

4.1.6 Receive Audio Path ...............................................................................................................15

4.1.7 Audio Path without De-emphasis or Pre-emphasis...............................................................15

4.1.8 Deviation Limiter....................................................................................................................16

4.2 Tone Signaling Processor................................................................................................ 17

4.2.1 Tone encoding/decoding .......................................................................................................17

4.2.2 Subaudio RX and TX Filter Characteristics...........................................................................18

4.2.3 CTCSS Subaudio Decoder and Encoder Tone Set ..............................................................20

4.2.4 Tone Signaling Processor Configuration Task Descriptions .................................................21

4.2.4.1 Normal Run Mode (Task 0).............................................................................................21

4.2.4.2 Reserved For Test (Task 1-3) .........................................................................................21

4.2.4.3 RX Configuration.............................................................................................................22

4.2.4.4 TX Configuration .............................................................................................................23

4.2.4.5 Initialize and Configure....................................................................................................24

4.3 RF Synthesizer ................................................................................................................ 26

4.3.1 Operating Range and Specifications.....................................................................................26

4.3.2 Main Divider...........................................................................................................................26

4.3.3 Phase Detector & Charge Pump ...........................................................................................26

4.3.4 Lock Detect Output................................................................................................................27

4.3.5 Reference Circuits .................................................................................................................27

4.4 Baseband Timing Generation .......................................................................................... 27

5 Software Programming ...............................................................................................28

5.1 C-BUS Serial Interface .................................................................................................... 28

5.1.1 8-Bit C-BUS Register Map ....................................................................................................29

5.1.2 16-Bit C-BUS Register Map ..................................................................................................30

5.1.2.1 GENERAL RESET ($01).................................................................................................30

5.1.2.2 SETUP Register ($80) ....................................................................................................31

5.1.2.3 AUDIO CONTROL Register ($81) ..................................................................................32

5.1.2.4 RX AUDIO LEVEL CONTROL Register ($82) ................................................................33

 2003 CML Microsystems Plc

2

D/838/8

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