Silicon Laboratories SI4734/35-B20 Rdsconfig, Amdeemphasis, Amchannelfilter, Amrsqinterrupts

Page 29

 

 

Si4734/35-B20

 

 

Table 15. Si473x Property Summary (Continued)

 

 

 

 

 

 

 

Prop

Name

Description

Default

 

 

 

 

 

 

0x1502

RDS_CONFIG

Configures RDS setting.

0x0000

 

 

 

 

 

 

0x3100

AM_DEEMPHASIS

Sets de-emphasis time constant. Can be set to 50 us. De-

0x0000

 

emphasis is disabled by default.

 

 

 

 

 

 

 

 

 

 

 

 

Selects the bandwidth of the channel filter for AM/SW/LW recep-

 

 

0x3102

AM_CHANNEL_FILTER

tion. The choices are 6, 4, 3, 2, or 1 (kHz). The default band-

0x0003

 

 

 

width is 2 kHz.

 

 

 

 

 

 

 

0x3200

AM_RSQ_INTERRUPTS

Configures interrupt related to RSQ metrics. All interrupts are

0x0000

 

disabled by default.

 

 

 

 

 

 

 

 

 

 

0x3201

AM_RSQ_SNR_HIGH_

Sets high threshold for SNR interrupt. The default is 0 dB.

0x007F

 

THRESHOLD

 

 

 

 

 

 

 

 

 

 

0x3202

AM_RSQ_SNR_LOW_

Sets low threshold for SNR interrupt. The default is 0 dB.

0x0000

 

THRESHOLD

 

 

 

 

 

 

 

 

 

 

0x3203

AM_RSQ_RSSI_HIGH_

Sets high threshold for RSSI interrupt. The default is 0 dB.

0x007F

 

THRESHOLD

 

 

 

 

 

 

 

 

 

 

0x3204

AM_RSQ_RSSI_LOW_

Sets low threshold for RSSI interrupt. The default is 0 dB.

0x0000

 

THRESHOLD

 

 

 

 

 

 

 

 

 

 

0x3300

AM_SOFT_MUTE_RATE

Sets the rate of attack when entering or leaving soft mute. The

0x0040

 

default is 278 dB/s.

 

 

 

 

 

 

 

 

 

 

 

 

Sets the AM/SW/LW soft mute slope. The bigger the number,

 

 

0x3301

AM_SOFT_MUTE_SLOPE

the higher the max attenuation level. Default value is a slope of

0x0002

 

 

 

2.

 

 

 

 

 

 

 

0x3302

AM_SOFT_MUTE_MAX_

Sets maximum attenuation during soft mute (dB). Set to 0 to dis-

0x0010

 

 

ATTENUATION

able soft mute. Default is 16 dB.

 

 

0x3303

AM_SOFT_MUTE_SNR_

Sets SNR threshold to engage soft mute. Default is 10 dB.

0x000A

 

THRESHOLD

 

 

 

 

 

 

 

 

 

 

0x3400

AM_SEEK_BAND_

Sets the bottom of the AM/SW/LW band for seek. Default is 520.

0x0208

 

BOTTOM

 

 

 

 

 

 

 

 

 

 

0x3401

AM_SEEK_BAND_TOP

Sets the top of the AM/SW/LW band for seek. Default is 1720.

0x06AE

 

 

 

 

 

 

0x3402

AM_SEEK_FREQ_

Selects frequency spacing for AM/SW/LW seek. Default is 10

0x000A

 

SPACING

kHz spacing.

 

 

 

 

 

 

 

 

 

0x3403

AM_SEEK_SNR_

Sets the SNR threshold for a valid AM/SW/LW Seek/Tune. If the

 

 

value is zero then SNR threshold is not considered when doing

0x0005

 

THRESHOLD

 

 

a seek. Default value is 5 dB.

 

 

 

 

 

 

 

 

 

 

 

0x3404

AM_SEEK_RSSI_

Sets the RSSI threshold for a valid AM/SW/LW Seek/Tune. If

 

 

the value is zero then RSSI threshold is not considered when

0x0019

 

THRESHOLD

 

 

doing a seek. Default value is 25 dBuV.

 

 

 

 

 

 

 

 

 

 

 

0x4000

RX_VOLUME

Sets the output volume.

0x003F

 

 

 

 

 

 

0x4001

RX_HARD_MUTE

Mutes the audio output. L and R audio outputs may be muted

0x0000

 

independently in FM mode.

 

 

 

 

 

 

 

 

 

 

Rev. 1.0

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Image 29
Contents Functional Block Diagram FeaturesApplications DescriptionSi4734/35-B20 Table of Contents Parameter Symbol Test Condition Min Typ Max Unit Electrical SpecificationsParameter Symbol Value Unit Recommended Operating ConditionsParameter Symbol Test Condition Min Typ Max Unit FM Mode DC CharacteristicsAM/SW/LW Mode Supplies and InterfaceGPO1, GPO2/INT Parameter Symbol Min Typ Max UnitRST Start Wire Control Interface Characteristics1,2,3Sclk Sdio Sclk SENSPI Control Interface Write Timing Parameters Dclk DFS Dout Fmdeemphasis = FM Receiver Characteristics1,2RDS Bler 5% Si4734/35-B20 KHz Long Wave LW 153 279 Crystal Oscillator RefclkprescaleRefclk Si4734/35-GM Typical Application SchematicOptional Components Bill of MaterialsComponents Value/Description Supplier Overview Functional Description5.5 3.6VFM Receiver Operating ModesAM Receiver SW ReceiverAudio Sample Rates Digital Audio Interface Si4735 OnlyAudio Data Formats I2S Digital Audio Format Stereo DAC Stereo Audio Processing De-emphasisSoft Mute RDS/RBDS Processor Si4735 OnlyBus Mode Select on Rising Edge TuningSeek Reference ClockSPI Control Interface Mode Reset, Power Up, and Power Down Firmware UpgradesProgramming with Commands GPO OutputsSi473x Command Summary Commands and PropertiesCmd DescriptionSi473x Property Summary Prop Name Description DefaultRxvolume RdsconfigAmdeemphasis AmchannelfilterPin Numbers Name Description Pin Descriptions Si4734/35-GMPart Number Description Package Operating Ordering GuideQFN RDS/RBDSTop Mark Explanation Package Markings Top MarksSi4734/35 Top Mark Package Outline Si4734/35 QFN Symbol Millimeters Min Nom MaxPCB Land Pattern PCB Land Pattern Si4734/35 QFNBSC PCB Land Pattern DimensionsSymbol Millimeters Min Max Additional Reference Resources Revision 0.4 to Revision Document Change ListContact 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.

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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.

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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.