CMX838 查看數據表（PDF） - CML Microsystems Plc

零件编号

产品描述 (功能)

生产厂家

CMX838

FRS/PMR446/GMRS Family Radio Processor

CML Microsystems Plc 

FRS/PMR446/GMRS Family Radio Processor

CMX838

Figure

FIGURES

Page

Figure 1: Block Diagram......................................................................................................................................6

Figure 2: Recommended External Components.................................................................................................9

Figure 3: Audio Processing Block Diagram ......................................................................................................10

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

subaudio signals. ...............................................................................................................................11

Figure 5: TX Input Amplifier ..............................................................................................................................11

Figure 6: Magnitude response for input low-pass filter. ....................................................................................12

Figure 7: Magnitude response for pre-emphasis filter. .....................................................................................12

Figure 8: Magnitude response of high-pass filter..............................................................................................13

Figure 9: Magnitude response of post-deviation limiter low-pass filter. ............................................................13

Figure 10: Magnitude response of de-emphasis filter.......................................................................................14

Figure 11: Transmit audio path frequency response with pre-emphasis..........................................................14

Figure 12: Receive audio path frequency response with de-emphasis. ...........................................................15

Figure 13: Audio path frequency response without pre-emphasis or de-emphasis..........................................15

Figure 14: Deviation limiter block diagram........................................................................................................16

Figure 15: Subaudio Block Diagram .................................................................................................................17

Figure 16: Subaudio RX filter gain for normal CTCSS operation. ....................................................................18

Figure 17: Subaudio RX filter delay for normal CTCSS operation....................................................................18

Figure 18: Subaudio TX level for normal CTCSS operation (Magnitude scale with respect to 0dBV) .............19

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

Figure 20: RF Synthesizer block diagram.........................................................................................................26

Figure 21: Block diagram of main programmable divider. ................................................................................26

Figure 22: C-BUS transaction timing diagram. .................................................................................................28

Figure 23: Basic FRS Radio Tx Architecture ....................................................................................................46

Figure 24: Basic FRS Radio Rx Architecture....................................................................................................46

Figure 25: CMX838 Main Function Blocks........................................................................................................47

Figure 26: CMX838 Main Sections ...................................................................................................................47

Figure 27: Audio Processing .............................................................................................................................48

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

Figure 29: Example Audio TX Voice Path.........................................................................................................49

Figure 30: Example Audio TX Internally Generated Tone with Loudspeaker Enabled Path ............................49

Figure 31: Tone Signaling Processor................................................................................................................50

Figure 32: Example CTCSS Tone Decoder Path .............................................................................................51

Figure 33: Example CTCSS Tone Encoder Path .............................................................................................51

Figure 34: Example Internal Audio Tone Encoder Path ...................................................................................52

Figure 35: Level Control....................................................................................................................................52

Figure 36: Example Single Point Modulation Level Path..................................................................................53

Figure 37: Example Two-Point Modulation Level Paths ...................................................................................53

Figure 38: Example Single Point Modulation with Varied Subaudio Level Paths.............................................53

Figure 39: Synthesizer and Charge Pump........................................................................................................54

Figure 40: Clock Generation .............................................................................................................................54

Figure 41: Powersave Scope and Related Control Registers ..........................................................................55

Figure 42: Synthesizer to Baseband Clock Control, $89 ..................................................................................55

 2003 CML Microsystems Plc

4

D/838/8

Share Link: