Rev. 0.5 10/08 Copyright © 2008 by Silicon Laboratories Si473x-B20 Si473x-B20 BROADCAST MULTI-BAND RADIO RECEIVER Features Applications Si473x Product Selector Guide ƒÞ FM band support: 76–108 MHz ƒÞ AM band support: 520–1710 kHz ƒÞ SW band support: 2.3–21.85 MHz (Si4734/35) ƒÞ LW band support: 153–279 kHz (Si4734/35) ƒÞ Weather band support: 162.4– 162.55 MHz (Si4736/37/38/39) ƒÞ 1050 Hz alert tone detection (Si4736/37/38/39) ƒÞ Excellent real-world performance ƒÞ Freq synthesizer with integrated VCO ƒÞ Advanced seek tuning ƒÞ Automatic frequency control (AFC) ƒÞ Automatic gain control (AGC) ƒÞ Integrated LDO regulator ƒÞ Digital FM stereo decoder ƒÞ Programmable de-emphasis ƒÞ Adaptive noise suppression ƒÞ AM/FM digital tuning ƒÞ EN55020 compliant ƒÞ No manual alignment necessary ƒÞ Programmable reference clock ƒÞ Volume control ƒÞ Programmable soft mute control ƒÞ RDS/RBDS processor (Si4731/35/37/39) ƒÞ Optional digital audio output (Si4731/35/37/39) ƒÞ 2-wire control interface ƒÞ 2.7 to 5.5 V supply voltage ƒÞ Firmware upgradeable ƒÞ Wide range of ferrite loop sticks and air loop antennas supported ƒÞ 3 x 3 x 0.55 mm 20-pin QFN package ƒÜ Pb-free/RoHS compliant ƒÞ Table and portable radios ƒÞ Audio video receivers ƒÞ Stereos ƒÞ Mini/micro systems ƒÞ CD/DVD players ƒÞ Portable media players ƒÞ Cellular handsets ƒÞ Emergency radios ƒÞ Clock radios ƒÞ Modules ƒÞ Mini HiFi ƒÞ Boom boxes Part FM AM RDS SW/LW WB Si4730 76 – 108 MHz „Ï Si4731 76 – 108 MHz „Ï „Ï Si4734 64 – 108 MHz „Ï „Ï Si4735 64 – 108 MHz „Ï „Ï „Ï Si4736 76 – 108 MHz „Ï „Ï Si4737 76 – 108 MHz „Ï „Ï „Ï Si4738 76 – 108 MHz „Ï Si4739 76 – 108 MHz „Ï „Ï Patents Pending Notes: 1. Place Si473x as close as possible to antenna jack and keep the FMI and AMI traces as short as possible. 2. Contact your local sales representatives for more information or to obtain application notes. Ordering Information: See page 18. Pin Assignments GND PAD 1 2 3 20 19 18 17 11 12 13 14 6 7 8 9 4 5 16 10 15 GPO2/INT VIO DOUT LOUT ROUT RST GND NC AMI RCLK SDIO VDD FMI RFGND GPO3/DCLK NC GPO1 DFS SCLK SEN Si473x-GM (Top View)

Si473x-B20 Rev. 0.5 3 TABLE OF CONTENTS Section Page 1. Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3. Typical AM/FM Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 4. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 5. Pin Descriptions:...

Si473x-B20 4 Rev. 0.5 1. Product Overview The Si473x receivers are the industry's first fully-integrated multiband radio receiver ICs from antenna input to audio output. They require minimal external components with no factory alignment. The Si473x receivers reduce the receiver footprint by >90% versus traditional AM/FM solutions. The Si473x also offer best-in-class performance with the most features. The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability. The Si473x receivers include advanced seek algorithms, adjustable...

Si473x-B20 Rev. 0.5 5 Table 2. Absolute Maximum Ratings1,2 Parameter Symbol Value Unit Supply Voltage VDD –0.5 to 5.8 V Interface Supply Voltage VIO –0.5 to 3.9 V Input Current3 IIN 10 mA Input Voltage3 VIN –0.3 to (VIO + 0.3) V Operating Temperature TOP –40 to 95 „aC Storage Temperature TSTG –55 to 150 „aC RF Input Level4 0.4 VPK Notes: 1. Permanent 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. Exposure beyond recommended operating conditions...

Si473x-B20 6 Rev. 0.5 Table 3. DC 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 FM Mode Supply Current IFM — 19.2 22 mA Supply Current1 IFM Low SNR level — 19.8 23 mA RDS Supply Current2 IFM — 19.9 23 mA WB Mode (Si4736/37/38/39 only) Supply Current IFM — 19.2 22 mA Supply Current1 IFM Low SNR level — 19.8 23 mA AM Mode (Si4730/31/34/35/36/37 only) Supply Current IAM — 17.3 20.5 mA Supplies and Interface Interface Supply Current IIO — 320 600 ìA VDD Powerdown Current IDDPD — 10 20 ìA VIO Powerdown Current IIOPD SCLK,...

Si473x-B20 Rev. 0.5 7 Figure 1. Reset Timing Parameters for Busmode Select Table 4. Reset Timing Characteristics1,2 (VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C) Parameter Symbol Min Typ Max Unit RST Pulse Width and GPO1, GPO2/INT Setup to RST„^ƒ£ tSRST 100 — — ìs GPO1, GPO2/INT Hold from RST„^ tHRST 30 — — ns Important Notes: 1. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is high) does not occur within 300 ns before the rising edge of RST. 2. When selecting 2-wire mode, the user must ensure that SCLK is high during...