SI4421-A1-FT Silicon Laboratories Inc, SI4421-A1-FT Datasheet - Page 12

• Manufacturer Part Number: SI4421-A1-FT
• Description: IC TXRX FSK 915MHZ 3.8V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4421-A1-FT

• Package / Case: 16-TSSOP
• Frequency: 433MHz, 868MHz, 915MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FSK
• Power - Output: 7dbm
• Sensitivity: -110dBm
• Voltage - Supply: 2.2 V ~ 3.6 V
• Current - Receiving: 15mA
• Current - Transmitting: 28mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 2
• Number Of Transmitters: 2
• Wireless Frequency: 433 MHz to 915 MHz
• Interface Type: SPI
• Output Power: 5 dBm to 7 dBm
• Operating Supply Voltage: 2.2 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 25 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1631-5

Note 1: Measured with disabled clock output buffer
Note 2: Not using a 10 MHz crystal is allowed but not recommended because all crystal referred timing and frequency parameters
Note 3: See the BER diagrams in the measurement results section (page 37) for detailed information
Note 4: See reference design with 50 Ohm Matching Network (page 39) for details
Note 5: See reference design with Resonant PCB Antenna (BIFA) on page 41 for details
Note 6: Optimal antenna admittance/impedance:
Note 7: Adjustable in 8 steps
Note 8: During the Power-On Reset period, commands are not accepted by the chip. In case of software reset (see Wake-Up Timer
Note 9: The crystal oscillator start up time strongly depends on the capacitance seen by the oscillator. Low capacitance and low
Note 10: By design
will change accordingly
Command, page 25) the reset timeout is 0.25ms typical.
ESR crystal is recommended with low parasitic PCB layout design.
Si4421
433 MHz
868 MHz
915 MHz
Y
1.49 - j12.8
1.2 - j11.9
antenna
2 – j5.9
[mS]
Z
antenna
52 + j152
7.8 + j83
9 + j77
[Ohm]
L
antenna
15.4
13.6
62
[nH]
Si4421
12