Si472x FM Radio Transceivers

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Si472x Block Diagram

The Si472x ICs are the industry's first single-chip FM radio transceivers. The proven and patented digital architecture of the Si472x ICs combines the functionality of the Si470x FM radio receiver with the Si471x FM transmitter, offering full FM receive and transmit capabilities in a single, ultra-small 3 mm x 3mm x 0.55 mm QFN package.

  • Si4720 FM radio receiver and transmitter with digital audio compression
  • Si4721 FM radio receiver and transmitter with digital audio compression and RDS

 

The device leverages Silicon Labs' proven FM technology and offers unmatched integration and performance, allowing FM receive and transmit to be added to any portable device by using a single chip. As with the Si470x and Si471x products, the Si472x ICs offer industry-leading size, performance, low-power consumption and ease of use.

 

Features

  • Worldwide FM receive band support (76–108 MHz)
  • Worldwide FM transmit compliance (76–108 MHz)
  • Digital audio out for FM record (Si4721)
  • Digital audio in for FM transmit (Si4721)
  • RDS/RBDS encoder and decoder (Si4721)
 

Applications

  • Cellular handsets/hands free
  • MP3 players
  • Portable media players
  • GPS/navigation devices
  • Satellite digital audio radios
  • Personal computers 
     

Technologies

  • Embedded transmit and receive antenna support for "antenna-free" device enclosures
  • Proven receive power scan algorithm example code
  • Programmable transmit output voltage control for worldwide compliance and flexible antenna design support

Documentation    Expand All   Collapse All

 
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Data Sheet (1)

Document NameDescriptionVersionLast Updated
Si4720-21-B20.pdf
Si4720-21-B20 Broadcast FM Radio Transceiver for Portable Applications1.0

Data Short (1)

Document NameDescriptionVersionLast Updated
Si4720-21_short.pdf
Si4720/21 Data Short3.26.08

User Guides (1)

Document NameDescriptionVersionLast Updated
Si47xxEVB.pdf
Si47xx-EVB User Guide0.82/8/2012

Application Notes (8)

Document NameDescriptionVersionLast Updated
AN299.pdf
AN299: External 32.768 kHz Crystal Oscillator0.1
AN307.pdf
AN307: Si4712/13/20/21 Receive Power Scan Primer0.2
AN316.pdf
AN316: AM/FM Tuner Field Test Procedure0.2
AN332.pdf
AN332: Si47xx Programming Guide0.812/1/2011
AN346_Chinese.pdf
AN346: Si47xx Evaluation Board Quick Start Guide (Chinese)0.1 (Chines4)
AN346.pdf
AN346: Si47xx Evaluation Board Quick-Start Guide0.1
AN383.pdf
AN383: Si47xx Antenna, Schematic, Layout and Design Guidelines0.612/3/2011
AN388.pdf
AN388: Si470/1x/2x/3x/4x Evaluation Board Test Procedure0.2

White Papers (1)

Document NameDescriptionVersionLast Updated
FMTutorial.pdf
FM Tutorial0926089/26/2008

PCN (4)

Document NameDescriptionVersionLast Updated
1105271 Si4700 4701-Bxx Si4710 4713 20-Axx Si4706-C31 Si4733-C30 Si4784 4785 EOL LTB std.pdf
1105271 Si4700 4701-Bxx Si4710 4713 20-Axx Si4706-C31 Si4733-C30 Si4784 4785 EOL LTB std
1110251 Si47xx-B20 B30 B31 C40 D50 D60 3x3mm QFN Change to Copper Wire in ASEKR std.pdf
1110251 Si47xx-B20 B30 B31 C40 D50 D60 3x3mm QFN Change to Copper Wire in ASEKR std
1104011-Cancelled-ASEKR Die Bond Adhesive – Japan Earthquake and Tsunami Disaster Recovery.pdf
Cancelled-ASEKR Die Bond Adhesive – Japan Earthquake and Tsunami Disaster Recovery
1001251-Si471x_and_Si472x_Transition_revA_to_revB_Std.pdf
Si471x_and_Si472x_Transition_revA_to_revB_Std

Design Tools    Expand All   Collapse All

 
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Software (1)

Document NameDescriptionVersionUpdated
AN332_Si47xxExampleCode.zip
AN332SW0.31/24/2009

Product Matrix


Part Number Available DocumentsDescriptionDig I/ORDS Support
Si4720Data Sheet
FM radio receiver and transmitter NoNo
Si4721Data Sheet
FM radio receiver and transmitterYesYes

The Si4721 is the industry's first single-chip integrated FM radio transceiver including both receive and transmit support for the European Radio Data System (RDS) and the U.S. Radio Broadcast Data System (RBDS). RDS allows digital information sent from the broadcaster to be displayed, such as station ID, song name and music category. In Europe, alternate frequency (AF) information is also provided to automatically change stations in areas where broadcasters use multiple frequencies. In transmit mode, digital information such as artist name, song title, music category and branded messaging can be transmitted and displayed on any RDS/RBDS receiver.

The Si472x ICs digital integration reduces the required external components of traditional offerings, resulting in a solution requiring only an external inductor and bypass capacitor and a PCB space of approximately 15 mm². The Si472x ICs are layout compatible with Silicon Labs' Si470x FM radio receivers, Si473x AM/FM radio receivers and the Si471x FM radio transmitter solutions, allowing a single PCB layout to accommodate a variety of music features. High yield manufacturability, unmatched performance, easy design-in and software programmability are key advantages of the Si472x ICs.

Training & Resources

Featured Videos

Class D Audio Driver and Reference Design
Class D Audio Driver and Reference Design
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Si4830 Wheel-Tuned Digital CMOS AM/FM Radio Receiver IC


Featured Web Utilities

Class D Audio Sound Quality Demo

The Class D audio driver interactive demonstration allows you to see the sound quality performance of the Si824x Class D audio driver over the audible spectrum. The demo shows the total harmonic distortion + noise (THD + N) ratio, a universal measure of sound quality for audio amplifiers.


Featured White Papers

Key Requirements for Multi-Tuner Automotive Radio Designs

Automotive OEMs and Tier 1 suppliers understand that consumers expect a superior in-vehicle audio experience and are responding by designing sophisticated infotainment systems. The radio components used in today's vehicles need to be cost-effective while meeting rigorous automotive levels of performance. With the advent of multi-tuner automotive infotainment systems, car radio developers must now consider a wide range of performance requirements and new technologies in their designs.

Designing Wheel-Tuned, Digital-Display Radios with Next-Generation Radio ICs

As a growing number of portable applications such as mobile phones and portable media players integrate the FM radio function, there’s a misconception that traditional radios are no longer needed. In reality, wheel-tuned radios have remained immensely popular. This article will discuss how to design a mid-level wheel-tuned radio with an LCD to display frequencies, and it will explore the practical considerations in selecting audio ICs and display drivers, as well as how to leverage these technologies to deliver the best end-user radio tuning experience. Available in English and Simplified Chinese.


Featured Tutorials and Presentations

Multiband Receiver Family Overview

The Si473x is the industry's first fully integrated, 100% CMOS AM/FM/shortwave/longwave/weather bandradio receiver IC. This family of radio receiverICs 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 solutions.

Introducing High-Performance FM RDS Data Receiver ICs

The Si4749/06 are 100% CMOS receiver ICs, offering full receive functionality from antenna to RDS/RBDS data for use in the automotive and portable navigation markets. The Si4749/06 is an ideal RDS/RBDS data receiver for Traffic Message Channel (TMC) and Open Data Applications (ODA) applications frequently used in conjunction with GPS functionality.

View all Audio/Video Training & Resources...

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