Si4734-35_short

Broadcast AM/FM/SW/LW Radio Receiver

Description

The Si4734/35 is the industry's first fully integrated, 100% CMOS AM/FM/SW/LW radio receiver IC. Offering unmatched integration and PCB space savings, the Si4734/35 requires minimal external components and less than 20 mm2 of board area, excluding the antenna inputs. The Si4734/35 AM/FM/SW/LW radio provides the space savings and low power consumption necessary for portable devices while delivering the high performance and design simplicity desired for all AM/FM/SW/LW solutions.

Leveraging Silicon Laboratories' proven and patented Si4700/01 FM tuner's digital low intermediate frequency (low-IF) receiver architecture, the Si4734/35 delivers superior RF performance and interference rejection in AM, FM, and short wave and long wave bands. The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability.

The Si4734/35 is a feature-rich solution including advanced seek algorithms, soft mute, auto-calibrated digital tuning, and FM stereo processing. In addition, the Si4734/35 provides analog or digital audio output and a programmable reference clock. The device supports I2C-compatible 2-wire control interface, SPI, and a Si4700/01 backwards-compatible 3-wire control interface.

The Si4734/35 utilizes digital processing to achieve high fidelity, optimal performance, and design flexibility. The chip provides excellent pilot rejection, selectivity, and unmatched audio performance, and offers both the manufacturer and the end-user extensive programmability and flexibility in the listening experience.The Si4735 incorporates a digital processor for the European Radio Data System (RDS) and the North American Radio Broadcast Data System (RBDS), including all required symbol decoding, block synchronization, error detection, and error correction functions. Using RDS, the Si4735 enables broadcast data such as station identification and song name to be displayed to the user.FM / SW ANTFMILNAAGCADCLNAAGC2.7 -5.5 VVDDGNDLDOAFCADCDSPDACLOUTFeatures

----------------------Worldwide FM band support (64–108 MHz)Worldwide AM band support (520–1710 kHz)SW band support (2.3–21.85 MHz)LW band support (153–279 kHz)AM/FM/SW/LW digital tuningNo manual alignment necessaryEN55020 compliant

Excellent real-world performanceAdjustable channel filters

Advanced AM/FM/SW/LW seek tuningDigital volume control

Adjustable soft mute control

Frequency synthesizer with integrated VCOAutomatic frequency control (AFC)Automatic gain control (AGC)Programmable de-emphasisIntegrated LDO regulator

Programmable reference clock

FM RDS/RBDS processor (Si4735 only)2-wire and 3-wire control interface2.7 to 5.5 V supply voltage

3 x 3 x 0.55 mm 20-pin QFN package-Pb-free/RoHS compliantTable and portable radiosStereosMini/micro systemsPortable media playersBoomboxesClock radiosModulesEntertainment systemsCellular handsetsApplications---------Si4734/35RDS(Si4735)LOW-IFDIGITALAUDIO(Si4735)DOUTDFSGPO/DCLKAM / LWANTAMIRFGNDDACROUTCONTROLINTERFACEVIO1.5-3.6VSCLKSDIOSENAM/FM ReceiverCopyright © 2007 by Silicon Laboratories

RCLKRST11.7.07

Si4734/35

Broadcast AM/FM/SW/LW Radio Receiver

Selected FM Electrical Specifications

ParameterSymbolInput FrequencyfRFSensitivity headphone matchingSensitivity 50 Ω matchingInput IP3

Adjacent Channel SelectivityAlternate Channel SelectivityAudio Band LimitsAudio Mono S/NAudio THD

Audio Output VoltageSupply Voltage*VD, VA Interface Supply Voltage*VIOPowerdown Current*IPD*Note: Applies to both FM and AM modes.Test Condition(S+N)/N = 26 dB(S+N)/N = 26 dB

|f2 – f1| > 1 MHz; f0 = 2 x f1 – f2

±200 kHz±400 kHz±1.5 dB

Min76—————30——722.71.5—

Typ—2.21.11055070—630.180——10

Max108—————15k——905.53.6—

UnitMHzµV EMFµV EMFdBµV EMF

dBdBHzdB%mVrmsVVµA

Selected AM/SW/LW Electrical Specifications

Parameter

Input Frequency

Symbol fRF

Test Condition Medium wave (AM)Short wave (SW)Long wave (LW)(S+N)/N = 26 dB

Min 5202.3153— — — 54

Typ———38560.160

Max 171021.85279— — —66

UnitkHzMHzkHzµV EMFdB%mVrms

SensitivityAudio S/NAudio THD

Audio Output Voltage

Pin Assignments

GPO3/DCLKGPO2/INT3 x 3 x 0.55 mm, 20-pin QFN Package Information GPO1NC1201918171615DOUTFMI2RFGND3AMI4RST56SEN7SCLK8SDIO9RCLK10VIOGNDPAD11VDDDFS14LOUT13ROUT12GNDNCSymbol

Min

AA1bcDD2eEE2

0.500.000.180.271.60

Millimeters

Nom0.550.020.250.323.00 BSC1.700.50 BSC3.00 BSC1.70

Max0.600.050.300.371.80

Symbol

Min

fLL1aaabbbcccdddeee

0.350.00—————

Millimeters

Nom2.53 BSC0.40——————

Max0.450.100.100.100.080.100.10

1.601.80

AM/FM ReceiverCopyright © 2007 by Silicon Laboratories11.7.07

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