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参数资料
| 型号： | 4421-DKDB2 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 32/45页 |
| 文件大小： | 0K |
| 描述： | KIT DEV TEST EZRADIO SI4421 TRX |
| 标准包装： | 1 |
| 附件类型： | 测试卡，收发器，434MHz |
| 适用于相关产品： | EZRadio? |
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Si4421
CRYSTAL SELECTION GUIDELINES
The crystal oscillator of the Si4421 requires a 10 MHz parallel mode crystal. The circuit contains an integrated load capacitor in
order to minimize the external component count. The internal load capacitance value is programmable from 8.5 pF to 16 pF in 0.5
pF steps. With appropriate PCB layout, the total load capacitance value can be 10 pF to 20 pF so a variety of crystal types can be
used.
When the total load capacitance is not more than 20 pF and a worst case 7 pF shunt capacitance (C 0 ) value is expected for the
crystal, the oscillator is able to start up with any crystal having less than 100 ohms ESR (equivalent series loss resistance). However,
lower C 0 and ESR values guarantee faster oscillator startup.
The crystal frequency is used as the reference of the PLL, which generates the local oscillator frequency (f LO ). Therefore, f LO is
directly proportional to the crystal frequency. The accuracy requirements for production tolerance, temperature drift and aging can
thus be determined from the maximum allowable local oscillator frequency error.
Whenever a low frequency error is essential for the application, it is possible to “pull” the crystal to the accurate frequency by
changing the load capacitor value. The widest pulling range can be achieved if the nominal required load capacitance of the crystal is
in the “midrange”, for example 16 pF. The “pull-ability” of the crystal is defined by its motional capacitance and C 0 .
Maximum XTAL Tolerances Including Temperature and Aging [ppm]
Bit Rate: 2.4 kbps
Deviation [± kHz]
30
45
60
75
90
105
120
433 MHz
868 MHz
915 MHz
20
10
10
30
20
15
50
25
25
70
30
30
90
40
40
100
50
50
100
60
50
Bit Rate: 9.6 kbps
Deviation [± kHz]
30
45
60
75
90
105
120
433 MHz
868 MHz
915 MHz
15
8
8
30
15
15
50
25
25
70
30
30
80
40
40
100
50
50
100
60
50
Bit Rate: 38.4 kbps
Deviation [± kHz]
30
45
60
75
90
105
120
433 MHz
868 MHz
915 MHz
don't use
don't use
don't use
5
3
3
20
10
10
30
20
15
50
25
25
75
30
30
75
40
40
Bit Rate: 115.2 kbps
Deviation [± kHz]
105
120
135
150
165
180
195
433 MHz
868 MHz
915 MHz
don't use
don't use
don't use
3
don't use
don't use
20
10
10
30
20
15
50
25
25
70
35
30
80
45
40
32
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| 4021-DKDB13 | KIT DEV TEST EZRADIO SI4021 TX |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 4421-DKDB5 | 功能描述:射频开发工具 Test Board BIFA TRx (868MHz) RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| 4421-DQ0025 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
| 4421-DQ4096 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
| 4421-DS0025 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
| 4421-DS4096 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Heavy Duty Incremental Rotary Shaft Encoder |
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