Silicon Laboratories SI4421 manual Si4421, PCB Layout Top View Bottom View

Page 40

Si4421

Notes:

1.SRF, DCR and Q should be similar if components from other manufacturer used

2.The SRF should be twice as much as the operation frequency

3.The dielectric type should be C0G and the resonant frequency should be similar if components from alternative vendor used.

4.The values are valid for 1.5mm thick FR4 PCB. If thinner board used the capacitor value should be increased (and vice versa) to minimize the level of the second harmonic components.

PCB Layout

Top View

Bottom View

Image 40

Contents FUNCTIONAL BLOCK DIAGRAM FEATURESDESCRIPTION TYPICAL APPLICATIONSDETAILED FEATURE-LEVELDESCRIPTION RF Power Amplifier PAData Filtering and Clock Recovery Si4421Low Battery Voltage Detector Wake-UpTimerData Validity Blocks Crystal OscillatorSi4421 PACKAGE PIN DEFINITIONS NameType FunctionSi4421 Internal Pin ConnectionsName Internal connectionPIN6 Logic Diagram FSK / DATA / nFFS PIN10 Logic Diagram nRES I/ONote These pins can be left floating Si4421Si4421 Typical ApplicationRecommended supply decoupling capacitor values Pin Function vs. Operation ModeAbsolute Maximum Ratings non-operating Si4421 GENERAL DEVICE SPECIFICATIONSRecommended Operating Range DC Characteristics ELECTRICAL SPECIFICATIONSi4421 AC Characteristics Receiver AC Characteristics PLL parametersSi4421 Si4421 AC Characteristics TransmitterAC Characteristics Turn-on/Turnaroundtimings AC Characteristics OthersSi4421 Note 10 By designTiming Specification Si4421 CONTROL INTERFACETiming Diagram Control Register Default Values Control CommandsSi4421 Description of the Control Commands Configuration Setting Command2. Power Management Command Si4421Logic connections between power control bits Si4421Frequency Setting Command 4. Data Rate Command5. Receiver Control Command Si4421VDI Logic Diagram Si44216. Data Filter Command Si44217.FIFO and Reset Mode Command Si44218. Synchron Pattern Command 9. Receiver FIFO Read Command10. AFC Command Si4421Si4421 Bit 5-4rl1 to rl0Frequency Setting Command 11. TX Configuration Control CommandSi4421 12. PLL Setting Command 13. Transmitter Register Write CommandSi4421 15.Low Duty-CycleCommand 14. Wake-UpTimer CommandSi4421 Vlb= 2.25 + V · 0.1 V Clock divider configuration Si4421Si4421 17. Status Read CommandBit Name Si4421 INTERRUPT HANDLING TX REGISTER BUFFERED DATA TRANSMISSION Si4421Si4421 Typical TX register usageSi4421 RX FIFO BUFFERED DATA READ RECOMMENDED PACKET STRUCTURESSi4421 CRYSTAL SELECTION GUIDELINES Bit Rate 2.4 kbpsBit Rate 9.6 kbps Bit Rate 38.4 kbpsSi4421 RX-TXALIGNMENT PROCEDURES Si4421 RESET MODES Sensitive Reset Enabled, Ripple on Vdd FIFO and Reset Mode Command pageSW Reset Command Si4421Si4421 TYPICAL PERFORMANCE CHARACTERISTICS Channel Selectivity and BlockingBER Curves in 433 MHz Band Si4421BER Curves in 868 MHz Band Si4421 434 MHzSi4421 REFERENCE DESIGNS SchematicsEvaluation Board with 50 Ohm Matching Network Frequency Dependent Component ValuesSi4421 PCB Layout Top View Bottom ViewSchematics Si4421Evaluation Board with Resonant PCB Antenna BIFA Frequency Dependent Component ValuesPCB Layout Antenna designed for 868/915 MHz band Si4421Top View Bottom View 16-pinTSSOP Si4421 PACKAGE INFORMATIONSee Detail “A” Section B-B RELATED PRODUCTS AND DOCUMENTS Si4421 Universal ISM Band FSK TransceiverDemo Boards and Development Kits Related ResourcesSi4421