SI4322-A1-FT Silicon Laboratories Inc, SI4322-A1-FT Datasheet - Page 32
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SI4322-A1-FT
Manufacturer Part Number
SI4322-A1-FT
Description
IC RCVR FSK 915MHZ 3.8V 16-TSSOP
Manufacturer
Silicon Laboratories Inc
Type
FSK Receiverr
Specifications of SI4322-A1-FT
Package / Case
16-TSSOP
Frequency
868MHz, 915MHz
Sensitivity
-104dBm
Data Rate - Maximum
256 kbps
Modulation Or Protocol
FSK
Applications
Remote Control, RKE, Security Systems
Current - Receiving
14mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Features
RSSI Equipped
Voltage - Supply
2.2 V ~ 3.8 V
Operating Frequency
915 MHz
Operating Supply Voltage
2.5 V, 3.3 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Supply Current
12 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Operating Temperature
-
Memory Size
-
Lead Free Status / Rohs Status
Supplier Unconfirmed
Other names
336-1628-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SI4322-A1-FT
Manufacturer:
INTERSIL
Quantity:
747
Si4322
12. Crystal Selection Guidelines
The crystal oscillator of the Si4322 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 to 16 pF in 0.5 pF steps. With appropriate PCB layout, the total load capacitance value can be 10 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
) value is
0
expected for the crystal, the oscillator is able to start up with any crystal having less than 100 ESR (equivalent
series loss resistance). However, lower C
and ESR values guarantee faster oscillator startup.
0
The crystal frequency is used as the reference of the PLL, which generates the local oscillator frequency (f
).
LO
Therefore, f
is directly proportional to the crystal frequency. The accuracy requirements for production tolerance,
LO
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
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.
32
Rev. 1.2