Silicon Laboratories SI47XX User Manual

Broadcast Audio Solutions

HIGHLY INTEGRATED AND EASY TO IMPLEMENT

SINGLE-CHIP SOLUTIONS

PRODUCT DESCRIPTION

Silicon Laboratories’ family of Si47xx broadcast audio solutions is the industry’s first to

leverage digital integration and 100% CMOS, resulting in a completely integrated solution

that requires only two external components and less than 15 mm² of board space. Offering

unmatched integration, the Si47xx family enables FM

longwave and weather band radio reception in any device. Leveraging Silicon Labs’ proven

digital low intermediate frequency (low-IF) receiver architecture and frequency synthesizer

technology, the Si47xx family delivers superior RF performance and interference rejection.

Digital signal processing is utilized to provide optimum sound quality under varying

reception conditions. The high level of integration and simplified bill of materials (BOM)

enable on-board production testing, increased quality, and improved manufacturing.

The Si47xx family also uses a streamlined programming model, which further reduces

development time. Having shipped millions of devices worldwide, the proven products of

the Si47xx family are ready to be integrated into any portable device.

transmission and AM, FM, shortwave,

FEATURES

• Worldwide FM band

support (64–108 MHz)

Worldwide AM band

•

support (520–1720 kHz)

• Shortwave band support (2.3–26.1 MHz)

• Longwave band support (153–279 kHz)

• Weather band support, 1050 Hz warning tone

detection (162.4–162.55 kHz)

• Specific Area Message Encode (SAME) support

• Requires only 2 external components

• Advanced AM/FM seek tuning

• PCB trace/integrated antenna support for

FM receive and transmit

• Excellent receive overload immunity

• Adaptive noise suppression

• Programmable audio characteristics

• Digital stereo modulator/demodulator

• Programmable transmit level

• Line-level analog input/output

• Digital FM TX gain compression

• Digital audio interface

• Frequency synthesizer with integrated VCO

• Programmable reference clock

• Pb-free and RoHS compliant

APPLICATIONS

• Cellular handsets/hands free

Portable media players and accessories

•

• Consumer electronics

• Navigation devices

• Satellite radios

• AM/FM portable and table radios

Superior Sound

www.silabs.com/audio

MOST INNOVATIVE BROADCAST SOLUTIONS

• First AM/FM digital CMOS solution family

First, and smallest, FM transceiver (receive and transmit)

•

• First to support small integrated antennas for FM receive and transmit

• World’s smallest FM receiver footprint

• First AM/FM IC with RDS

• First AM/FM IC with no manual alignment required

• First multi-band support for AM/FM/SW/LW and WB

• First footprint compatible family of broadcast audio products

• Highest level of integration

SOLUTIONS GUIDE

HIGHLY INTEGRATED

BEST-IN-CLASS PERFORMANCE

EASIEST TO DESIGN

Broadcast Audio Solutions

HIGHLY INTEGRATED

Single PCB for All Broadcast Audio Designs

EASIEST TO IMPLEMENT

Highest Level of Integration

The Si47xx products are the first fully integrated

broadcast audio ICs. These solutions require

2

only two external components and 15 mm

less of board space in contrast to dozens of

external components and as much as five times

or

Si4702/03

• FM receiver

• RDS (Si4703)

the amount of board space for competing

products. The high level of integration, small

footprint and low power consumption enable

the integration of multi-band receivers, FM

receivers, FM transmitters, FM transceivers,

or data receivers into any consumer device

such as mobile phones, MP3 accessories,

media players, and navigation devices.

Best-in-Class Performance

Si4704/05/06

• FM receiver

• RDS (Si4705/06)

• Enhanced RDS (Si4706)

• Requires no external antenna

Si4710/11/12/13

• FM transmitter

• RDS (Si4711/13)

• Receive Power Scan (RPS)

The Si47xx family’s excellent selectivity

and sensitivity improve user experience

and result in reduced interference and

increased reception. Its advanced digital

audio processing delivers optimum sound

quality superior to other solutions even in the

presence of variable signal conditions, and

its digital architecture enables performance

that is unmatched compared to standard

analog solutions. With advanced AM and FM

seek algorithms and software programmable

audio flexibility, the Si47xx family provides an

unmatched level of performance.

Easiest to Design and Manufacture

The Si47xx family is delivered as a fully tested

system requiring no factory alignment. Its

simple hardware design reduces development

time, unlike other solutions that require

dozens of components limiting production

flow and adding performance variability

across products. Evaluation and design is

easy with a full reference board including

schematics and layout files and a robust

development graphical user interface (GUI).

These solutions also accept a wide range

of antenna inputs from headphone cables

to ultra-small ferrites and integrated tuned

loops.

Silicon Laboratories and the Silicon Labs logo are trademarks of Silicon Laboratories
Inc. All other product or service names are the property of their respective owners.
CI, 5000, April 08 , Rev B SOL-AUD-2008B

RDS and RBDS Support

The Si47xx family includes a series of solutions that incorporates a digital processor for the European

Radio Data System (RDS) and the US Radio Broadcast Data System (RBDS) including all required

symbol decoding, block synchronization, error detection, and correction functions. Using this feature,

these products enable data such as station identification, artist name, and song title to be transmitted

to and displayed on any RDS/RBDS receiver. The Si4749/06 incorporate a high-performance

RDS/RBDS decoder based on patented methodologies, and deliver excellent RDS/RBDS sensitivity

performance, synchronization to RDS/RBDS at high BLER levels and RDS/RBDS data decoding with

superior decoder reliability, making them ideal for performance-intensive Traffic Message Channel

(TMC) applications in navigation devices.

Broadcast Audio Product Family

Part Number Description RDS Support Dig I/O

Si4702/03 FM radio receivers Si4703 —
Si4704
Si4706 Enhanced FM RDS/TMC radio receiver, no external antenna required Si4706 Si4706
Si4707 Weather band radio receiver with SAME decoder — —
Si4708/09 World’s smallest FM tuner with RDS Si4709 —
Si4710/11 FM radio transmitter with RDS and digital audio compression Si4711 Si4711
Si4712/13 FM radio transmitter with RDS, digital audio compression and RPS Si4713 Si4713
Si4720/21 FM radio transceivers with digital audio compression Si4721 Si4721
Si4730/31 AM/FM radio receivers Si4731 Si4731
Si4734
Si4736/37 AM/FM/weather band radio receivers Si4737 Si4737
Si4738/39 FM/weather band radio receivers Si4739 Si4739
Si4749 Enhanced FM RDS/TMC radio receiver, automotive qualified Si4749 —

1

Extended FM tuning range 64-108 MHz

2

AM/FM only

Footprint Compatible

The Si47xx family requires only two external components and offers

many footprint compatible multi-band receivers.

Si4720/21

• FM transceiver

• Receive Power Scan (RPS)

• RDS (Si4721)

• Requires no external antenna

Si4730/31

• AM/FM receiver

Actual size

• RDS (Si4731)

Si4734/35

• AM/FM/shortwave/longwave
receiver

• RDS (Si4735)

Si4707/36/37/38/39

• AM/FM/weather band

(Si4712/13)

1

/051 FM radio receiver, no external antenna required Si4705 Si4705

1

/351 AM/FM/shortwave/longwave radio receivers Si4735 Si4735

Silicon Laboratories Inc.

400 West Cesar Chavez • Austin, TX 78701

Toll Free: [phone]
Email: [e-mail]
Web site: www.silabs.com

receiver

• RDS (Si4737/39)

• SAME (Si4707- WB only)

2

2