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参数资料
| 型号： | 4022-DKDB13 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 726K |
| 描述： | KIT DEV TEST EZRADIO SI4022 TX |
| 标准包装： | 1 |
| 附件类型： | 测试卡，发射器，868MHz，915MHz |
| 适用于相关产品： | EZRadio? |
17
Si4022
Bit Rate:
20
40
60
80
100
120
140
160
868
2
12
25
30
40
50
70
80
915
2
12
20
30
40
50
60
70
Bit Rate:
20
40
60
80
100
120
140
160
868
do not use
8
20
30
40
50
60
70
915
do not use
8
15
30
40
50
60
70
Bit Rate:
20
40
60
80
100
120
140
160
868
do not use do not use
10
20
30
40
50
70
915
do not use do not use
10
20
30
40
50
60
Bit Rate:
20
40
60
80
100
120
140
160
868
do not use do not use do not use do not use do not use
2
12
25
915
do not use do not use do not use do not use do not use
2
12
20
2.4 kbps
9.6 kbps
38.4 kbps
115.2 kbps
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
CRYSTAL SELECTION GUIDELINES
The crystal oscillator of the Si4022 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 300 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]
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:
Note:
Note:
Note:
Note: There may be other requirements for the TX carrier accuracy with regards to the requirements as defined by standards and/or
channel separations.
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