Si4736/37/38/39-C40 BROADCAST AM/FM RADIO RECEIVER Features NOAA weather band support AM/FM/WB digital tuning (162.4162.55 MHz) No manual alignment necessary Worldwide FM band support Programmable reference clock (64108 MHz) Volume control Worldwide AM band support Adjustable soft mute control (5201710 kHz) (Si4736/37) RDS/RBDS processor (Si4737/39) 1050 Hz alert tone detection Optional digital audio out (Si4737/39) Ordering Information: Excellent real-world performance 2-wire and 3-wire control interface See page 31. Freq synthesizer with integrated VCO Integrated LDO regulator Advanced AM/FM seek tuning 2.0 to 5.5 V supply voltage (SSOP) Automatic frequency control (AFC) Pin Assignments 2.7 to 5.5 V supply voltage (QFN) Automatic gain control (AGC) Wide range of ferrite loop sticks and Si4736/37/38/39 (QFN) Digital FM stereo decoder air loop antennas supported Programmable AVC max gain QFN and SSOP packages Programmable de-emphasis RoHS compliant 20 19 18 17 NC 1 16 Applications FMI 2 15 DOUT Emergency radios Boom boxes RFGND 3 14 LOUT GND Table and portable radios Modules PAD AMI 4 13 ROUT Stereos Clock radios RST 5 12 GND Mini/micro systems Mini HiFi 6 11 VDD 7 8 9 10 Description The Si4736/37/38/39 is the first digital CMOS AM/FM radio receiver IC that Si4736/37 (SSOP) integrates the complete tuner function from antenna input to audio output. DOUT LOUT 1 24 ROUT DFS 2 23 Functional Block Diagram GPO3/DCLK 3 22 DBYP GPO2/INT 4 21 VDD GPO1 5 20 VIO Si473x NC 6 19 RCLK AMI RDS NC 7 18 SDIO DIGITAL DOUT AM LNA (Si4737/ AUDIO ANT FMI 8 17 SCLK RFGND DFS 39) (Si4737/ RFGND 9 16 SEN 39) GPO/DCLK AGC LOW-IF NC 10 15 RST NC 11 14 GND FM/ ADC DAC ROUT AMI 12 13 GND WB ANT LNA DSP FMI ADC DAC LOUT This product, its features, and/or its AGC architecture is covered by one or more of 2.7 5.5 V (QFN) 2.0 5.5 V (SSOP) VDD the following patents, as well as other CONTROL LDO AFC VIO patents, pending and issued, both foreign GND INTERFACE 1.853.6 V 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 7,339,504. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 1, 2021 RCLK SEN SCLK SDIO RST SEN NC SCLK SDIO GPO1 RCLK GPO2/INT VIO GPO3/DCLK DFSSi4736/37/38/39-C40 TABLE OF CONTENTS Section Page 1. Electrical Specifications .3 2. Typical Application Schematic (QFN) .16 3. Typical Application Schematic (SSOP) 17 4. Bill of Materials (QFN/SSOP) .18 5. Functional Description .19 5.1. Overview 19 5.2. Operating Modes 19 5.3. FM Receiver .20 5.4. AM Receiver .20 5.5. Weather Band Receiver 20 5.6. Digital Audio Interface (Si4737/39 Only) 20 5.7. Stereo Audio Processing 22 5.8. De-emphasis .22 5.9. Stereo DAC 22 5.10. Soft Mute .22 5.11. RDS/RBDS Processor (Si4737/39 Only) 22 5.12. Tuning .22 5.13. Seek 23 5.14. Reference Clock .23 5.15. Control Interface .23 5.16. GPO Outputs 24 5.17. Firmware Upgrades .25 5.18. Reset, Powerup, and Powerdown 25 5.19. Programming with Commands 25 6. Commands and Properties 26 7. Pin Descriptions: Si4736/37/38/39-GM .29 8. Pin Descriptions: Si4736/37-GU 30 9. Ordering Guide 31 10. Package Markings (Top Marks) 32 10.1. Si4736/37/38/39 Top Mark (QFN) 32 10.2. Top Mark Explanation (QFN) .32 10.3. Si4736/37 Top Mark (SSOP) .33 10.4. Top Mark Explanation (SSOP) 33 11. Package Outline: Si4736/37/38/39 QFN .34 12. PCB Land Pattern: Si4736/37/38/39 QFN 35 13. Package Outline: Si4736/37 SSOP .37 14. PCB Land Pattern: Si4736/37 SSOP 38 15. Additional Reference Resources 39 Document Change List .40 Contact Information 41 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 1, 2021