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Silicon Lab adds AM/FM receivers to portfolio

Posted: 26 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:receivers? AM/FM? RDS? RBDS? Silicon Labs?

Si473x AM/FM receiver from Silicon Labs

Silicon Laboratories Inc. has added the Si473x AM/FM receiver family to its broadcast audio product portfolio. The Si473x enables an AM/FM receiver to be easily added to consumer devices such as clock and portable radios, home stereos, MP3 players, docking stations and mobile handsets.

The Si473x is said to be the first fully integrated AM/FM radio receiver, from antenna input to audio output, in a single monolithic IC. Conventional AM/FM radio implementations are large, expensive and difficult to manufacture, limiting the inclusion of AM radio functionality in many small, portable, high-volume applications. The single-chip receiver requires only two external components in 0.15cm? of board space compared to more than 50 components and 10cm? of board space for conventional solutions.

Digital architecture
By leveraging a digital architecture, the Si473x simplifies design and manufacturing. It is said to be the only AM/FM receiver that does not need manual alignment, which can take up to several minutes per device. While traditional AM/FM solutions may require four stages of hand tuning, this new device supports a wide variety of antennas with an on-chip varactor and auto calibration to streamline manufacturing.

The Si473x features efficient seek performance and adjustability for both AM and FM, resulting in reduced interference and improved reception. The excellent sensitivity and selectivity of this device identify many stations other AM/FM radios do not detect or incorrectly identify as valid. The high audio quality of the Si473x offers adjustable soft mute and other audio enhancement features.

RDS/RBDS support
The Si4731 also supports the European Radio Data System (RDS) and the U.S. Radio Broadcast Data System (RBDS), reportedly the only receiver to do so. This feature enables data such as the station ID and song name to be displayed on the LCD of any device, creating a visual user experience similar to that of a portable media player.

Samples of the Si4730 and Si4731 are available in a compact 3-by-3mm 20-pin QFN package. Pricing for the Si4730 begins at $4.87 in quantities of 10,000. Pricing for the Si4731, which supports RDS/RBDS, begins at $5.53 in quantities of 10,000. An evaluation board is available for $150.

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