Silicon Laboratories SI4734/35-B20 FM Receiver Characteristics1,2, RDS Bler 5%, Fmdeemphasis =

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Si4734/35-B20

Table 9. FM Receiver Characteristics1,2

(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

 

 

 

 

 

 

 

Input Frequency

fRF

 

76

—

108

MHz

Sensitivity with Headphone

 

(S+N)/N = 26 dB

—

2.2

3.5

µV EMF

Network3,4,5

 

 

 

 

 

 

Sensitivity with 50 Ω Network3,4,5,6

 

(S+N)/N = 26 dB

—

1.1

—

µV EMF

RDS Sensitivity6

 

Δf = 2 kHz,

—

15

—

µV EMF

 

 

RDS BLER < 5%

 

 

 

 

 

 

 

 

 

 

 

LNA Input Resistance6,7

 

 

3

4

5

kΩ

LNA Input Capacitance6,7

 

 

4

5

6

pF

Input IP36,8

 

 

100

105

—

dBµV EMF

AM Suppression3,4,6,7

 

m = 0.3

40

50

—

dB

Adjacent Channel Selectivity

 

±200 kHz

35

50

—

dB

 

 

 

 

 

 

 

Alternate Channel Selectivity

 

±400 kHz

60

70

—

dB

 

 

 

 

 

 

 

Spurious Response Rejection6

 

In-band

35

—

—

dB

Audio Output Voltage3,4,7

 

 

72

80

90

mVRMS

Audio Output L/R Imbalance3,7,9

 

 

—

—

1

dB

Audio Frequency Response Low6

 

–3 dB

—

—

30

Hz

Audio Frequency Response High6

 

–3 dB

15

—

—

kHz

Audio Stereo Separation7,9

 

 

25

—

—

dB

Audio Mono S/N3,4,5,7,10

 

 

55

63

—

dB

Audio Stereo S/N4,5,7,10,11

 

 

—

58

—

dB

Audio THD3,7,9

 

 

—

0.1

0.5

%

De-emphasis Time Constant6

 

FM_DEEMPHASIS = 2

70

75

80

µs

 

 

FM_DEEMPHASIS = 1

45

50

54

µs

 

 

 

 

 

 

 

Audio Output Load Resistance6,10

RL

Single-ended

10

—

—

kΩ

Audio Output Load Capacitance6,10

CL

Single-ended

—

—

50

pF

Notes:

1.Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at RF = 98.1 MHz.

2.To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.

3.FMOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.

4.Δf = 22.5 kHz.

5.BAF = 300 Hz to 15 kHz, A-weighted.

6.Guaranteed by characterization.

7.VEMF = 1 mV.

8.f2 – f1 > 2 MHz, f0 = 2 x f1 – f2. AGC is disabled. Refer to "6. Pin Descriptions: Si4734/35-GM" on page 30.

9.Δf = 75 kHz.

10.At LOUT and ROUT pins.

11.Analog audio output mode.

12.At temperature (25°C).

12

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 InterfaceParameter Symbol Min Typ Max Unit RSTGPO1, GPO2/INT Wire Control Interface Characteristics1,2,3 StartSclk Sdio SEN SclkSPI Control Interface Write Timing Parameters Dclk DFS Dout FM Receiver Characteristics1,2 RDS Bler 5%Fmdeemphasis = Si4734/35-B20 KHz Long Wave LW 153 279 Refclkprescale RefclkCrystal Oscillator Typical Application Schematic Si4734/35-GMBill of Materials Components Value/Description SupplierOptional Components Functional Description Overview5.5 3.6VOperating Modes FM ReceiverAM Receiver SW ReceiverDigital Audio Interface Si4735 Only Audio Data FormatsAudio 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/RBDSPackage Markings Top Marks Si4734/35 Top MarkTop Mark Explanation Symbol Millimeters Min Nom Max Package Outline Si4734/35 QFNPCB Land Pattern Si4734/35 QFN PCB Land PatternPCB Land Pattern Dimensions Symbol Millimeters Min MaxBSC 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.
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