CMX881 参数 Datasheet PDF下载

PMR信令处理器

CMX881

目录

部分

1.0

1.1

1.2

1.3

1.4

页面

Features........................................................................................................................1

简要Description............................................................................................................1

块Diagram...............................................................................................................7

信号列表.....................................................................................................................8

外部元件................................................ .................................................. 10

1.4.1 PCB布局指南和电源去耦................................... 11

1.4.2调制器输出............................................. ............................................. 12

一般Description..................................................................................................... 13

1.5.1睡眠模式和自动开始向上......................................... ............................... 14

1.5.2辅助ADC ............................................. .................................................. .. 14

1.5.3接收Mode................................................................................................. 15

1.5.4发送模式............................................. .................................................. 22

1.5.5 FFSK / MSK数据打包.......................................... ................................... 26

1.5.6 C- BUS操作........................................... ................................................. 28

C- BUS寄存器说明............................................. ........................................... 29

应用笔记........................................................................................................ 47

1.7.1 CRC和奇偶校验信息........................................... ................................. 47

性能Specification........................................................................................... 48

1.8.1电气性能............................................. ....................................... 48

1.8.2 Packaging....................................................................................................... 58

页面

同时接收信令模式所支持的CMX881 ....................................... 15

亚音............................................................................................................. 18

DCS调制方式............................................... ................................................ 18

DCS 23位代码....................................................................................................... 19

选呼音.............................................................................................................. 20

并发的Tx模式支持的CMX881 ........................................... ............. 22

数据频率为每波特率............................................ ............................. 25

DTMF双音及相应的Tx编程代码................................... 26

最大数据传输延迟.............................................. ................................... 27

页面

1.5

1.6

1.7

1.8

表

表1

表2

表3

表4

表5

表6

表7

表8

表9

科幻gure

图1框图............................................................................................................. 7

图2中推荐的外部元件............................................. ........................... 10

图3电源连接和去耦......................................... ..................... 11

图4调制器输出组件来实现-100dB /十倍频程滚降................................ 12

图5接收音频滤波器的频率响应........................................... .............................. 16

图6去加重曲线TIA / EIA- 603符合..................................... .................. 16

图7低通亚音频频带滤波器的CTCSS和DCS ..................................... .......... 17

图8为25kHz声道音频滤波器响应模板.......................................... .............. 23

图9 12.5kHz信道音频滤波器响应模板......................................... ............ 23

图10音频频率预加重模板.......................................... ...................... 24

图11调制波的1200和2400波特FFSK / MSK信号....................... 25

图12的C- BUS Transactions................................................................................................. 28

图13可能PMR配置............................................. ........................................ 47

图14， C- BUS Timing.......................................................................................................... 56

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2004年CML微Plc的

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