Silicon Laboratories SI4734/35-B20 manual Refclkprescale, Crystal Oscillator

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Si4734/35-B20

Table 12. Reference Clock and Crystal Characteristics (VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)

Parameter	Symbol	Test Condition	Min	Typ	Max	Unit

	Reference Clock

RCLK Supported Frequencies*			31.130	32.768	40000.0	kHz
RCLK Frequency Tolerance			–50	—	50	ppm

REFCLK_PRESCALE			1	—	4095

REFCLK			31.130	32.768	34.406	kHz

	Crystal Oscillator

Crystal Oscillator Frequency			—	32.768	—	kHz

Crystal Frequency Tolerance*			–100	—	100	ppm

Board Capacitance			—	—	3.5	pF

*Note: The Si4734/35 divides the RCLK input by REFCLK_PRESCALE to obtain REFCLK. There are some RCLK frequencies between 31.130 kHz and 40 MHz that are not supported. See AN332, Table 6 for more details.

Rev. 1.0

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Contents Features Functional Block DiagramApplications DescriptionSi4734/35-B20 Table of Contents Electrical Specifications Parameter Symbol Test Condition Min Typ Max UnitParameter Symbol Value Unit Recommended Operating ConditionsDC Characteristics Parameter Symbol Test Condition Min Typ Max Unit FM ModeAM/SW/LW Mode Supplies and InterfaceRST Parameter Symbol Min Typ Max UnitGPO1, GPO2/INT Wire Control Interface Characteristics1,2,3 StartSclk Sdio SEN SclkSPI Control Interface Write Timing Parameters Dclk DFS Dout RDS Bler 5% FM Receiver Characteristics1,2Fmdeemphasis = Si4734/35-B20 KHz Long Wave LW 153 279 Refclk RefclkprescaleCrystal Oscillator Typical Application Schematic Si4734/35-GMComponents Value/Description Supplier Bill of MaterialsOptional Components Functional Description Overview5.5 3.6VOperating Modes FM ReceiverAM Receiver SW ReceiverAudio Data Formats Digital Audio Interface Si4735 OnlyAudio Sample Rates I2S Digital Audio Format Stereo Audio Processing De-emphasis Stereo DACSoft Mute RDS/RBDS Processor Si4735 OnlyTuning Bus Mode Select on Rising EdgeSeek Reference ClockSPI Control Interface Mode Firmware Upgrades Reset, Power Up, and Power DownProgramming with Commands GPO OutputsCommands and Properties Si473x Command SummaryCmd DescriptionProp Name Description Default Si473x Property SummaryRdsconfig RxvolumeAmdeemphasis AmchannelfilterPin Descriptions Si4734/35-GM Pin Numbers Name DescriptionOrdering Guide Part Number Description Package OperatingQFN RDS/RBDSSi4734/35 Top Mark Package Markings Top MarksTop Mark Explanation Symbol Millimeters Min Nom Max Package Outline Si4734/35 QFNPCB Land Pattern Si4734/35 QFN PCB Land PatternSymbol Millimeters Min Max PCB Land Pattern DimensionsBSC Additional Reference Resources Document Change List Revision 0.4 to RevisionContact Information

SI4734/35-B20 specifications

Silicon Laboratories SI4734/35-B20 is an advanced, highly integrated broadcast radio receiver designed for various consumer applications. Hailed for its compactness and versatility, the SI4734/35-B20 offers extensive features that enable radio reception across multiple frequency bands, including AM, FM, and shortwave. It caters to the needs of manufacturers looking to incorporate reliable radio capabilities into their devices, ensuring quality sound and performance without the cumbersome designs typically associated with traditional radio receivers.

At the heart of the SI4734/35-B20 are performance-optimized technologies. One standout feature is the device's ability to support digital and analog processing simultaneously, utilizing Silicon Labs’ proprietary digital signal processing (DSP) technology. This architecture not only enhances signal clarity but also helps in mitigating noise, enabling users to experience a superior audio quality across varied environments.

Another notable characteristic of the SI4734/35-B20 is its low power consumption, making it ideal for battery-operated devices. The receiver employs sophisticated power management techniques that allow it to operate efficiently, prolonging battery life while maintaining optimal performance. In this context, the “sleep” mode and fast wake-up times contribute to significant energy savings, affirming its suitability for portable applications.

The SI4734/35-B20 is designed with a robust set of features for ease of integration into various systems. The device supports multiple programmable interfaces, including I2C, providing flexibility in communication with microcontrollers and facilitating straightforward integration into existing designs. Because of its programmable architecture, developers can customize the receiver’s capabilities according to the specific needs of their applications.

Additional features include automatic frequency control (AFC) for stability in tuning, allowing seamless transitions while listening to programs. The built-in AGC (automatic gain control) optimizes the receiver's sensitivity to ensure clear reception even in weak signal conditions.

The SI4734/35-B20 also possesses a wide frequency range, accommodating both standard and niche applications. Its compact form factor and surface-mount technology (SMT) footprint further enhance its appeal to developers seeking to maximize board space in their designs.

In conclusion, the Silicon Laboratories SI4734/35-B20 is a significant advancement in radio receiver technology, combining advanced DSP, low power consumption, and ease of integration. These attributes make it a preferred choice for engineers and manufacturers looking to deliver high-quality audio experiences across a range of consumer electronics, from radios to multifunctional smart devices.