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CMX838

FRS/PMR446/GMRS Family Radio Processor

MX-COM Inc  

FRS/PMR446/GMRS Family Radio Processor

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CMX838 Advance Information

Page

Figure 1: Block Diagram ..................................................................................................................................... 7

Figure 2: Recommended External Components .............................................................................................. 10

Figure 3: Audio Processing Block Diagram...................................................................................................... 11

Figure 4: Digitally controlled amplifiers and switch matrix for adjusting and switching transmit audio and

subaudio signals. .............................................................................................................................. 12

Figure 5: TX Input Amplifier.............................................................................................................................. 12

Figure 6: Magnitude response for input low-pass filter. ................................................................................... 13

Figure 7: Magnitude response for preemphasis filter....................................................................................... 13

Figure 8: Magnitude response of high-pass filter. ............................................................................................ 14

Figure 9: Magnitude response of post-deviation limiter low-pass filter. ........................................................... 14

Figure 10: Magnitude response of deemphasis filter. ...................................................................................... 15

Figure 11: Transmit audio path frequency response with preemphasis. ......................................................... 15

Figure 12: Receive audio path frequency response with deemphasis............................................................. 16

Figure 13: Audio path frequency response without preemphasis or deemphasis. .......................................... 16

Figure 14: Deviation limiter block diagram. ...................................................................................................... 17

Figure 15: Subaudio Block Diagram................................................................................................................. 18

Figure 16: Subaudio RX filter gain for normal CTCSS operation..................................................................... 19

Figure 17: Subaudio RX filter delay for normal CTCSS operation. .................................................................. 19

Figure 18: Subaudio TX level for normal CTCSS operation (Magnitude scale with respect to 0dBV) ............ 20

Figure 19: Subaudio TX filter delay for normal CTCSS operation. .................................................................. 20

Figure 20: RF Synthesizer block diagram. ....................................................................................................... 27

Figure 21: Block diagram of main programmable divider................................................................................. 27

Figure 22: C-BUS transaction timing diagram.................................................................................................. 29

Figure 23: Basic FRS Radio Tx Architecture ................................................................................................... 47

Figure 24: Basic FRS Radio Rx Architecture ................................................................................................... 47

Figure 25: CMX838 Main Function Blocks ....................................................................................................... 48

Figure 26: CMX838 Main Sections................................................................................................................... 48

Figure 27: Audio Processing ............................................................................................................................ 49

Figure 28: Example Audio RX Path.................................................................................................................. 49

Figure 29: Example Audio TX Voice Path ........................................................................................................ 50

Figure 30: Example Audio TX Internally Generated Tone with Loudspeaker Enabled Path ........................... 50

Figure 31: Tone Signaling Processor ............................................................................................................... 51

Figure 32: Example CTCSS Tone Decoder Path............................................................................................. 52

Figure 33: Example CTCSS Tone Encoder Path............................................................................................. 52

Figure 34: Example Internal Audio Tone Encoder Path................................................................................... 53

Figure 35: Level Control ................................................................................................................................... 53

Figure 36: Example Single Point Modulation Level Path ................................................................................. 54

Figure 37: Example Two-Point Modulation Level Paths .................................................................................. 54

Figure 38: Example Single Point Modulation with Varied Subaudio Level Paths ............................................ 54

Figure 39: Synthesizer and Charge Pump ....................................................................................................... 55

Figure 40: Clock Generation ............................................................................................................................ 55

Figure 41: Powersave Scope and Related Control Registers.......................................................................... 56

¤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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