CMX882 데이터 시트보기 (PDF) - CML Microsystems Plc

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CMX882

FRS Signalling Processor

CML Microsystems Plc 

FRS Signalling Processor

CMX882

Section

CONTENTS

Page

1.0 Features........................................................................................................................2

1.1 Brief Description............................................................................................................2

1.2 Block Diagram...............................................................................................................8

1.3 Signal List .....................................................................................................................9

1.4 External Components .................................................................................................. 11

1.4.1 PCB Layout Guidelines and Power Supply Decoupling ................................... 12

1.4.2 Modulator Outputs .......................................................................................... 13

1.5 General Description..................................................................................................... 14

1.5.1 Sleep Mode and Auto Start Up........................................................................ 16

1.5.2 Auxiliary ADC ................................................................................................. 16

1.5.3 Receive Mode................................................................................................. 17

1.5.4 Transmit Mode................................................................................................ 25

1.5.5 FFSK/MSK Data Packeting............................................................................. 29

1.5.6 XTCSS Coding................................................................................................ 32

1.5.7 C-BUS Operation ............................................................................................ 34

1.6 C-BUS Register Description ........................................................................................ 35

1.7 Application Notes ........................................................................................................ 57

1.7.1 CRC and FEC encoding information ............................................................... 57

1.7.2 Data Interleaving............................................................................................. 58

1.7.3 Scrambler Seed Transfer ................................................................................ 58

1.8 Performance Specification........................................................................................... 59

1.8.1 Electrical Performance.................................................................................... 59

1.8.2 Packaging....................................................................................................... 69

Table

Page

Table 1 Voice Processing Combinations ................................................................................... 15

Table 2 Concurrent Rx Signalling Modes Supported by the CMX882 ....................................... 17

Table 3 CTCSS Tones ............................................................................................................. 20

Table 4 DCS Modulation Modes............................................................................................... 21

Table 5 DCS 23 Bit Codes ....................................................................................................... 22

Table 6 In-band Tones ............................................................................................................. 23

Table 7 Concurrent Tx Modes Supported by the CMX882 ........................................................ 25

Table 8 Data Frequencies for each Baud Rate ......................................................................... 29

Table 9 Maximum Data Transfer Latency................................................................................. 32

Figure

Page

Figure 1 Block Diagram ............................................................................................................. 8

Figure 2 Recommended External Components ........................................................................ 11

Figure 3 Power Supply Connections and De-coupling .............................................................. 12

Figure 4 Modulator output components to achieve -100dB/decade roll-off................................ 13

Figure 5 Rx Audio Filter Frequency Response ......................................................................... 18

Figure 6 De-emphasis Curve for TIA/EIA-603 Compliance....................................................... 18

Figure 7 Low Pass Sub-Audio Band Filter for CTCSS and DCS ............................................... 19

 2004 CML Microsystems Plc

6

D/882/7

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