- 您现在的位置：买卖IC网 > PDF目录21904 > 4021-DKDB2 (Silicon Laboratories Inc)KIT DEV TEST EZRADIO SI4021 TX PDF资料下载
参数资料
| 型号： | 4021-DKDB2 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 24/34页 |
| 文件大小： | 783K |
| 描述： | KIT DEV TEST EZRADIO SI4021 TX |
| 标准包装： | 1 |
| 附件类型： | 测试卡，发射器，915MHz |
| 适用于相关产品： | EZRadio? |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页当前第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
Si4021
24
CRYSTAL SELECTION GUIDELINES
The crystal oscillator of the Si4021 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. It is recommended to keep the PCB parasitic capacitances on the XTL pin as low as possible.
The crystal frequency is used as the reference of the PLL, which generates the RF carrier frequency (f
c
). Therefore f
c
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 carrier frequency error.
Maximum XTAL Tolerances Including Temperature and Aging [ppm]
Bit Rate:
2.4 kbps
30
60
90
120
150
180
210
433 MHz
20
50
75
100
100
100
100
868 MHz
10
25
40
60
75
100
100
915 MHz
10
25
40
50
75
75
100
Bit Rate:
9.6 kbps
30
60
90
120
150
180
210
433 MHz
15
50
75
100
100
100
100
868 MHz
8
25
40
60
75
75
100
915 MHz
8
25
40
50
70
75
100
Bit Rate:
38.4 kbps
30
60
90
120
150
180
210
433 MHz
don't use
20
50
75
100
100
100
868 MHz
don't use
10
30
40
60
75
100
915 MHz
don't use
10
25
40
60
75
75
Bit Rate:
115.2 kbps
30
60
90
120
150
180
210
433 MHz
don't use
don't use
don't use
don't use
30
50
100
868 MHz
don't use
don't use
don't use
don't use
20
30
50
915 MHz
don't use
don't use
don't use
don't use
15
30
50
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
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
.
Note:
? There may be other requirements for the TX carrier accuracy with regards to the requirements as defined by standards and/or
channel separations.
相关PDF资料 |
PDF描述 |
|---|---|
| 4022-DKDB13 | KIT DEV TEST EZRADIO SI4022 TX |
| 4320-DKDB5 | KIT DEV TEST EZRADIO SI4320 RX |
| 4320-DKDB4 | KIT DEV TEST EZRADIO SI4320 RX |
| PSL0101WBFD1 | LED WHITE 90LM 350MA 3000K SSML |
| PSL0101WBFB1 | LED WHITE 80LM 350MA 3000K SSML |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 4021-DKDB3 | 功能描述:射频开发工具 Test Board BIFA Tx (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 |
| 4021-DKDB7 | 功能描述:射频开发工具 Test Board xloop Tx (915/868MHz) 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 |
| 4021-G | 功能描述:4021 ELARA MOON MODULE GREEN RoHS:是 类别:光电元件 >> LED - 高亮度电源模块 系列:4021 ELRA MOON 标准包装:36 系列:5027 TFFC STAR K2 颜色:暖白色 配置:星形 在特定电流下的光通量 - 测试:75lm 电流 - 测试:350mA 电流 - 最大:1.5A 带连接器:无 驱动器电路:无 波长:- 电压:- |
| 4021M | 制造商:3M Electronic Products Division 功能描述:4021-M MS2 SPLICING RIG W/4031 80610026207 制造商:3M Electronic Products Division 功能描述:MS2 SPLICING RIG W/4031 HAND PUMP |
| 4021-M/36 | 功能描述:工具套件与外壳 MS2 SPLICING RIG W/4036-25 HND CRIMPR RoHS:否 制造商:Molex 产品: 类型: 大小: |
发布紧急采购，3分钟左右您将得到回复。