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CMX838

FRS/PMR446/GMRS Family Radio Processor

MX-COM Inc  

FRS/PMR446/GMRS Family Radio Processor

2

CMX838 Advance Information

Section

CONTENTS

Page

1 Block Diagram ............................................................................................................... 7

2 Signal List ...................................................................................................................... 8

3 External Components ................................................................................................. 10

4 General Description .................................................................................................... 11

4.1 Audio ............................................................................................................................... 11

4.1.1 Digitally Controlled Amplifiers (DCA) .................................................................................... 11

4.1.2 Transmit Input Amplifier ........................................................................................................ 12

4.1.3 Audio Switched Capacitor Filters.......................................................................................... 12

4.1.3.1 Preemphasis/Low-pass Filter ......................................................................................... 13

4.1.3.2 High-pass Filter .............................................................................................................. 14

4.1.3.3 Deviation Limiter Low-pass Filter ................................................................................... 14

4.1.4 Deemphasis .......................................................................................................................... 15

4.1.5 Transmit Audio Path ............................................................................................................. 15

4.1.6 Receive Audio Path .............................................................................................................. 16

4.1.7 Audio Path without Deemphasis or Preemphasis ................................................................ 16

4.1.8 Deviation Limiter ................................................................................................................... 17

4.2 Tone Signaling Processor ................................................................................................ 18

4.2.1 Tone encoding/decoding ...................................................................................................... 18

4.2.2 Subaudio RX and TX Filter Characteristics .......................................................................... 19

4.2.3 CTCSS Subaudio Decoder and Encoder Tone Set.............................................................. 21

4.2.4 Tone Signaling Processor Configuration Task Descriptions ................................................ 22

4.2.4.1 Normal Run Mode (Task 0) ............................................................................................ 22

4.2.4.2 Reserved For Test (Task 1-3) ........................................................................................ 22

4.2.4.3 RX Configuration ............................................................................................................ 23

4.2.4.4 TX Configuration............................................................................................................. 24

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

4.3 RF Synthesizer ................................................................................................................ 27

4.3.1 Operating Range and Specifications .................................................................................... 27

4.3.2 Main Divider .......................................................................................................................... 27

4.3.3 Phase Detector & Charge Pump .......................................................................................... 27

4.3.4 Lock Detect Output ............................................................................................................... 28

4.3.5 Reference Circuits ................................................................................................................ 28

4.4 Baseband Timing Generation .......................................................................................... 28

¤2001 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480221.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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