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Si4420
CRYSTAL SELECTION GUIDELINES
The crystal oscillator of the Si4420 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.
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: 2.4kbps
Deviation [+/- kHz]
30
45
60
75
90
105
120
315 MHz
433 MHz
868 MHz
915 MHz
25
20
10
10
50
30
20
15
75
50
25
25
100
70
30
30
100
90
40
40
100
100
50
50
100
100
60
50
Bit Rate: 9.6kbps
Deviation [+/- kHz]
30
45
60
75
90
105
120
315 MHz
433 MHz
868 MHz
915 MHz
20
15
8
8
50
30
15
15
70
50
25
25
75
70
30
30
100
80
40
40
100
100
50
50
100
100
60
50
Bit Rate: 38.3kbps
Deviation [+/- kHz]
30
45
60
75
90
105
120
315 MHz
433 MHz
868 MHz
915 MHz
don't use
don't use
don't use
don't use
7
5
3
3
30
20
10
10
50
30
20
15
75
50
25
25
100
75
30
30
100
75
40
40
25
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