SI4320-J1-FT Silicon Laboratories Inc, SI4320-J1-FT Datasheet - Page 23

• Manufacturer Part Number: SI4320-J1-FT
• Description: IC RCVR FSK 915MHZ 5.4V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4320-J1-FT

• Package / Case: 16-TSSOP
• Frequency: 315MHz, 433MHz, 868MHz, and 915MHz
• Sensitivity: -109dBm
• Data Rate - Maximum: 256 kbps
• Modulation Or Protocol: FSK, OOK
• Current - Receiving: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.4 V
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 315 MHz to 915 MHz
• Operating Supply Voltage: 2.2 V to 5.4 V
• Mounting Style: SMD/SMT
• Supply Current: 3 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1627-5

CRYSTAL SELECTION GUIDELINES
The crystal oscillator of the Si4320 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
oscillator is able to start up with any crystal having less than 300 ohms ESR (equivalent series loss resistance). However, lower C
values guarantee faster oscillator startup.
The crystal frequency is used as the reference of the PLL, which generates the local oscillator frequency (f
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.
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
The on chip AFC is capable to correct TX/RX carrier offsets as much as 80% of the deviation of the received FSK modulated signal.
Note:
Bit Rate: 2.4kbps
Bit Rate: 9.6kbps
Bit Rate: 38.3kbps
There may be other requirements for the TX carrier accuracy with regards to the requirements as defined by standards and/or
channel separations.
315 MHz
433 MHz
868 MHz
915 MHz
315 MHz
433 MHz
868 MHz
915 MHz
315 MHz
433 MHz
868 MHz
915 MHz
don’t use
don't use
don't use
don't use
30
30
20
10
10
30
25
15
30
8
8
60
75
50
25
25
60
70
50
25
25
60
30
20
10
10
100
100
90
75
40
40
90
75
40
40
90
75
50
30
25
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
Transmitter Deviation [+/- kHz]
120
100
100
120
100
100
120
100
60
50
60
50
75
40
40
150
100
100
150
100
100
150
100
100
75
75
75
70
60
60
0
.
0
) value is expected for the crystal, the
180
100
100
100
180
100
100
180
100
100
75
75
75
75
75
LO
). Therefore, f
210
100
100
100
100
210
100
100
100
100
210
100
100
100
75
LO
Si4320
0
is directly
and ESR
23