Si4831-35-B30Rev1 0

1 Rev. 1/11 Copyright 2011 by Silicon LaboratoriesSi4831/35-B30Si4831/35-B30 BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVERF eaturesApplicationsDescriptionThe si4831 /35-B30 is the 2nd generation mechanical-tuned digital CMOSAM/FM/SW radio receiver IC that integrates the complete receiver function fromantenna input to audio output. Like other successful audio products from SiliconLabs, si4831 /35-B30 offers unmatched integration and PCB space savings withminimum external components and a small board area. The si4831 /35-B30requires a simple application circuit and removes any requirements for manuallytuning components during the manufacturing process.

2 The si4831 /35-B30 is avery simple product to design, manufacture, and support across multiple productlines. The receiver has very low power consumption, runs off two AAA batteries,and delivers the performance benefits of digital tuning to the analog radio Block Diagram Worldwide FM band support (64 109 MHz) Worldwide AM band support (504 1750 kHz) SW band support (Si4835 only)( 22 MHz) Excellent real-world performance EN55020-compliant No manual alignment necessary Flexible band selections Automatic frequency control (AFC) Integrated LDO regulator to V supply voltage Wide range of ferrite loop sticks and air loop antennas supported 24-pin SSOP RoHS-compliant Supports station and stereo LED indicators Direct volume control Bass and treble tone control Table and portable radios Stereos Mini/micro systems CD/DVD players Boom boxes Modules Clock radios Mini HiFi Entertainment systemsSi4830/34 ADCADCDSPDACDACROUTLOUTAFCSi4831/35 RFGNDLNAAMIAGCREGVDD1 ~ OSCFMI0/90 ADCRSTXTALIAM ANTFM/SW ANTCONTROL INTERFACESTATIONSTEREOVOL/TONETUNE 1/2 BANDThis product, its features.

3 And/or itsarchitecture is covered by one or more ofthe following patents, as well as otherpatents, pending and issued, bothforeign and domestic: 7,127,217;7,272,373; 7,272,375; 7,321,324;7,355,476; 7,426,376; 7,471,940;7,339,503; 7,339, Information:See page AssignmentsSi4831/35-B30 (SSOP)NCFMIRFGNDAMIBANDTUNE2 TUNE1 STATIONSTEREONCNCNCRSTLOUTROUTDBYPVDD2 VOL+/TREBLEVOL-/BASSXTALOXTALIVDD1 GNDGND1234567891011122423222120191817161 51413Si4831/35-B302 Rev. OF CONTENTSS ectionPage1. Electrical Specifications .. 42. Typical Application Schematic .. 83. Bill of Materials.

4 94. Functional Description .. Overview .. FM Receiver .. AM Receiver .. SW Receiver .. Frequency Tuning .. Band Select .. Bass and Treble .. Volume Control .. 115. Pin Descriptions: si4831 /35-B30 .. 126. Ordering Guide .. 137. Package Markings (Top Marks) .. si4831 /35-B30 Top Mark .. Top Mark Explanation .. 148. Package Outline: si4831 /35-B30 .. 159. PCB Land Pattern: si4831 /35-B30 .. 1610. Additional Reference Resources .. 17 Document Change List ..18 Contact Information .. 20Si4831/35-B304 Rev. Electrical SpecificationsTable 1. Recommended Operating Conditions1,2 ParameterSymbolTest ConditionMinTypMaxUnitSupply Voltage3 VDD2 Supply Powerup Rise TimeVDDRISE10 sAmbient TemperatureTA 152585 CNote:1.

5 Typical values in the data sheet apply at VDD = V and 25 C unless otherwise All minimum and maximum specifications in the data sheet apply across the recommended operating conditions for minimum VDD= V. 3. Operation at minimum VDD is guaranteed by characterization when VDD voltage is ramped down to V. Part initialization may become unresponsive below 2. Absolute Maximum Ratings1,2 ParameterSymbolValueUnitSupply VoltageVDD to Current3 IIN 10mAOperating TemperatureTOP 40 to 95 CStorage TemperatureTSTG 55 to 150 CRF Input device damage may occur if the above Absolute Maximum Ratings are exceeded. Functional operation should be restricted to the conditions as specified in the operational sections of this data sheet.

6 Exposure beyond recommended operating conditions for extended periods may affect device The si4831 /35-B30 devices are high-performance RF integrated circuits with certain pins having an ESD rating of < 2 kV HBM. Handling and assembly of these devices should only be done at ESD-protected For input pins RST, VOL+/TREBLE, VOL /BASS, XTALO, XTALI, BAND, TUNE2, TUNE1, STATION, and At RF input pins, FMI and 1. Reset TimingTable 3. DC Characteristics(VDD= to V, TA= 15 to 85 C)ParameterSymbolTest ConditionMinTypMaxUnitFM ModeSupply Current1 IFM mASupply Current2 IFMLow SNR level mAAM/SW ModeSupply Current1 IAM mASupplies and InterfaceVDD Powerdown CurrentIDDPD 10 are guaranteed by LNA is automatically switched to higher current mode for optimum sensitivity in weak signal 4.

7 Reset Timing Characteristics(VDD = to V, TA = 15 to 85 C)ParameterSymbolMinTypMaxUnitRST Pulse Width and TUNE1, TUNE2 Setup to RST tSRST100 sTUNE1, TUNE2 Hold from RSTtHRST30 ns70%30%TUNE170%30%TUNE270%30%tSRSTRSTtH RSTSi4831/35-B306 Rev. 5. FM Receiver Characteristics1,2(VDD = to V, TA = 15 to 85 C)ParameterSymbolTest ConditionMinTypMaxUnitInput FrequencyfRF64 109 MHzSensitivity with Headphone Network3(S+N)/N = 26 dB V EMFLNA Input Resistance4,5 4 k LNA Input Capacitance4,5 5 pFAM Suppression4,5,6,7m = 50 dBInput IP34,8 105 dB V EMFA djacent Channel Selectivity4 200 kHz 50 dBAlternate Channel Selectivity4 400 kHz 65 dBAudio Output Voltage5,6,7 80 mVRMSA udio Mono S/N5,6,7,9,10 55 dBAudio Stereo S/N3,4,5,7,9,10, 55 dBAudio Frequency Response Low 3 dB 30 HzAudio Frequency Response High 3 dB15 kHzAudio Stereo Separation5,11 42 dBAudio THD6,5,11 %Audio Output Load Resistance4,10 RLSingle-ended10 k Audio Output Load Capacitance4.

8 10 CLSingle-ended 50pFPowerup/Band Switch Time4 110 testing information is available in AN569: si4831 /35-DEMO Board Test Procedure. Volume = maximum for all tests. Tested at RF = To ensure proper operation and receiver performance, follow the guidelines in AN555: Si483x-B Antenna, Schematic, Layout, and Design Guidelines. Silicon Laboratories will evaluate schematics and layouts for qualified Frequency is 76~109 Guaranteed by VEMF=1 FMOD= 1 kHz, MONO, and L = R unless noted f = |f2 f1| > 2 MHz, f0=2xf1 BAF= 300 Hz to 15 kHz, At LOUT and ROUT f = 75 6. AM/SW Receiver Characteristics1, 2(VDD = to V, TA = 15 to 85 C)Parameter Symbol Test Condition Min TypMax UnitInput Frequency fRF Medium Wave (AM)504 1750kHzShort Wave (SW) ,4,5(S+N)

9 /N = 26 dB 30 V EMFL arge Signal Voltage Handling5 THD < 8% 300 mVRMSP ower Supply Rejection Ratio5 VDD=100 mVRMS, 100 Hz 40 dBAudio Output Voltage3,6 60 mVRMSA udio S/N3,4,6 55 dBAudio THD3,6 Inductance5,7180 450 HPowerup/Band Switch Time5 From powerdown 110 testing information is available in AN569: si4831 /35-DEMO Board Test Procedure. Volume = maximum for all tests. Tested at RF = 520 To ensure proper operation and receiver performance, follow the guidelines in AN555: Si483x-B Antenna, Schematic, Layout, and Design Guidelines. Silicon Laboratories will evaluate schematics and layouts for qualified FMOD = 1 kHz, 30% modulation, 2 kHz channel BAF= 300 Hz to 15 kHz, Guaranteed by VIN= Stray capacitance on antenna and board must be < 10 pF to achieve full tuning range at higher inductance 7.

10 Reference Clock and Crystal Characteristics(VDD = to V, TA = 15 to 85 C)ParameterSymbolTest ConditionMinTypMaxUnitReference ClockXTALI Supported Reference Clock Frequencies kHzReference Clock Frequency Tolerance for XTALI 100 100ppmCrystal OscillatorCrystal Oscillator Frequency kHzCrystal Frequency Tolerance 100 100ppmBoard Capacitance Typical Application C4 close to VDD2 and DBYP All grounds connect directly to GND plane on Pin 6 and 7 leave To ensure proper operation and receiver performance, follow the guidelines in "AN555: Si483x-B Antenna, Schematic, Layout, and Design Guidelines." Silicon Labs will evaluate the schematics and layouts for qualified Pin 8 connects to the FM antenna interface and pin 12 connects to the AM antenna Place Si483x as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.