CMX883(2002) 데이터 시트보기 (PDF) - CML Microsystems Plc

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CMX883
(Rev.:2002)

Baseband Processor for ‘Leisure Radios’

CML Microsystems Plc 

FRS Signalling Processor

CMX883

Section

CONTENTS

Page

1.0 Features ........................................................................................................................1

1.1 Brief Description ............................................................................................................1

1.2 Block Diagram ...............................................................................................................7

1.3 Signal List......................................................................................................................8

1.4 External Components ..................................................................................................10

1.4.1 PCB Layout Guidelines and Power Supply Decoupling....................................11

1.4.2 Modulator Outputs...........................................................................................12

1.5 General Description .....................................................................................................13

1.5.1 Sleep Mode.....................................................................................................14

1.5.2 Auxiliary ADC..................................................................................................14

1.5.3 Receive Mode .................................................................................................15

1.5.4 Transmit Mode ................................................................................................22

1.5.5 XTCSS Coding................................................................................................25

1.5.6 C-BUS Operation ............................................................................................27

1.6 C-BUS Register Description.........................................................................................28

1.7 Application Notes.........................................................................................................44

1.8 Performance Specification...........................................................................................45

1.8.1 Electrical Performance ....................................................................................45

1.8.2 Packaging .......................................................................................................53

Table

Page

Table 1 Concurrent Rx Signalling Modes Supported by the CMX883........................................ 15

Table 2 CTCSS Tones ............................................................................................................. 18

Table 3 DCS Modulation Modes............................................................................................... 18

Table 4 DCS 23 Bit Codes ....................................................................................................... 19

Table 5 In-band Tones ............................................................................................................. 20

Table 6 Concurrent Tx Modes Supported by the CMX883 ........................................................ 22

Figure

Page

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

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

Figure 3 Power Supply Connections and De-coupling............................................................... 11

Figure 4 Modulator output components to achieve -100dB/decade roll-off ................................ 12

Figure 5 Rx Audio Filter Frequency Response.......................................................................... 16

Figure 6 De-emphasis Curve for TIA/EIA-603 Compliance ....................................................... 16

Figure 7 Low Pass Sub-Audio Band Filter for CTCSS and DCS ............................................... 17

Figure 8 25kHz Channel Audio Filter Response Template........................................................ 23

Figure 9 12.5kHz Channel Audio Filter Response Template..................................................... 23

Figure 10 Audio Frequency Pre-emphasis Template ................................................................ 24

Figure 11 C-BUS Transactions................................................................................................. 27

Figure 12 Possible FRS Configuration...................................................................................... 44

Figure 13 C-BUS Timing .......................................................................................................... 52

Figure 14 Mechanical Outline of 28-pin SSOP (D6): Order as part no. CMX883D6 ................ 53

Figure 15 Mechanical Outline of 28-pin TSSOP (E1): Order as part no. CMX883E1............... 53

© 2002 CML Microsystems Plc

5

D/883/2

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