参数资料
型号: SI4421-A0-FT
厂商: Silicon Laboratories Inc
文件页数: 32/45页
文件大小: 0K
描述: IC TXRX FSK 915MHZ 3.8V 16-TSSOP
标准包装: 96
频率: 433MHz,868MHz,915MHz
数据传输率 - 最大: 256kbps
调制或协议: FSK
应用: ISM
功率 - 输出: 7dbm
灵敏度: -110dBm
电源电压: 2.2 V ~ 3.8 V
电流 - 接收: 15mA
电流 - 传输: 28mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
工作温度: -40°C ~ 85°C
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
包装: 管件
产品目录页面: 585 (CN2011-ZH PDF)
其它名称: 336-1737-5
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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