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.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
SI4711-B30-GM
IC TX FM RADIO 76-108MHZ 20UQFN
SI4713-B30-GMR
IC TX FM RADIO RPS/RDS 20UQFN
SKY12146-321LF
IC VAR VOLT ATTEN 12QFN
SN171GG-NR
SNAP PROTOBOARD W/NO RADIO
SWLP.2450.12.4.B.02
ANTENNA WI-FI WLAN 2.4GHZ
TD4A
SENSOR RTD LIQUID TEMP 2TERM
TD5A
SENSOR RTD TEMP MINI 3LEAD
TG.09.0113W
ANT 5-BAND GSM HINGE TERMINAL
相关代理商/技术参数
SI4022-A0-FTR
功能描述:射频发射器 Transmitter EZRadio RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel
Si4022-A1-FT
功能描述:射频发射器 TRNSMITTR EZRadio UNIVRSL ISM BAND FSK RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel
SI-40232
制造商:BEL 制造商全称:Bel Fuse Inc. 功能描述:SI-40232
SI-40233
制造商:BEL 制造商全称:Bel Fuse Inc. 功能描述:SI-40233
SI-40234
制造商:BEL 制造商全称:Bel Fuse Inc. 功能描述:SI-40234
SI-40235
制造商:BEL 制造商全称:Bel Fuse Inc. 功能描述:SI-40235
SI-40236
制造商:BEL 制造商全称:Bel Fuse Inc. 功能描述:SI-40236
SI-40238
制造商:BEL 制造商全称:Bel Fuse Inc. 功能描述:SI-40238