Si4311/12 RF Receivers

Note: The Si4311 and Si4312 products are not available for new design, please use the Si4355 low current Sub-GHz receiver.
The ​EZRadio Si431x RF receivers complement Silicon Labs' highly differentiated EZRadio transmitters. The Si4311 standalone 315/434 MHz FSK RF receiver accepts an FSK modulated RF input and outputs demodulated digital data without requiring an external MCU to configure the device. The Si4312 RF receiver is the OOK version of the Si4311.
The Si4311/12 RF receivers offer a simple, single-ended radio implementation over the 240–960 MHz frequency range. A receive sensitivity of up to –118 dBm allows for the creation of communication links with an extended range.
 
 

Features

  • Frequency range: 240–960 MHz
  • Sensitivity: –118 dBm
  • Low power consumption
  • Data rate: 0.2 to 128 kbps
  • FSK, GFSK, and OOK modulation schemes
  • Power supply: 1.8 to 3.6 V
  • Ultra low power shutdown mode
 
 

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Documentation

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Data Sheet (2)

DescriptionVersionUpdatedSize
Si4311-B12/B21 315/433.92 MHZ FSK Receiver
1.05/2/2012210 kB
Si4312 315/433.92 MHZ OOK Receiver
0.57/13/2010202 kB

Data Short (2)

DescriptionVersionUpdatedSize
Si4311 Data Short
06.21.107/13/201049 kB
Si4312 Data Short
06.21.107/13/201097 kB

User Guides (2)

DescriptionVersionUpdatedSize
Si4311-DB User's Guide
0.37/13/2010450 kB
Si4312-DB User's Guide
0.37/13/2010460 kB

White Papers (3)

Product Matrix
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Part NumberOutput Power 868 MHzOutput Power 434 MHzSupply VoltagePackage TypeFSKDescriptionOOKSensitivityFrequency Bands
Si4311-B12-GM2.7 - 3.6 VQFN2010 kbpsFSK Receiver (RX) without squelch enabled-104 dBm315 MHz; 433.92 MHz
Si4311-B21-GM2.7 - 3.6 VQFN2010 kbpsFSK Receiver (RX) with squelch enabled-104 dBm315 MHz; 433.92 MHz
Si43122.7 - 3.6 VQFN20RX10 kbps-110 dBm315 MHz; 434 MHz
    Note: The Si4311 and Si4312 products are not available for new design, please use the Si4355 low current Sub-GHz receiver.
    The Si431x RF receivers offer excellent receiver performance in cost-sensitive radio applications. The Si431x RF receivers provide designers with advanced features to enable low system power consumption by offloading a number of RF-related activities from the system MCU allowing for extended MCU sleep periods. Additional features, such as an automatic wake-up timer, 64-byte RX FIFO and a preamble detection circuit are available.​
    The Si4311/12 RF receivers offer a simple, single-ended radio implementation over the 240–960 MHz frequency range. A receive sensitivity of up to –118 dBm enables the creation of communication links with an extended range. The Si431x RF receivers offer excellent receiver performance in cost-sensitive radio applications. The Si431x RF receivers provide designers with advanced features to enable low system power consumption by offloading a number of RF-related activities from the system MCU allowing for extended MCU sleep periods.
    Additional features, such as an automatic wake-up timer, 64-byte RX FIFO and a preamble detection circuit, are available.
    The Si431x devices digital receive architecture features an ADC and DSP-based modem that performs the radio demodulation and filtering for increased performance. The high integration of the Si431X RF receivers reduces the external BOM to two antenna matching components, a crystal and a bypass capacitor while removing the requirement for expensive RF SAW and IF ceramic filters.
    The Si431x RF receivers are designed to work with a microcontroller, crystal, and a few passives to create a very low-cost system. Voltage regulators are integrated on-chip, which allows a wide range of operating supply voltage conditions from +1.8 to +3.6 V.
    A standard 4-pin SPI bus is used to communicate with the microcontroller. Three configurable general-purpose I/Os are also available. Minimal antenna matching is required allowing the use of a single ac coupling capacitor, which simplifies the system design and lowers the solution cost.

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