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FM tuner supports embedded antenna

Posted: 15 Apr 2008     Print Version  Bookmark and Share

Keywords:embedded antenna  FM tuner  tunable resonance circuit 

The Si4704 and Si4705 incorporate all of the features found in Silicon Laboratories' CMOS Si4700 FM tuner family, and are touted to be the industry's first to support an embedded antenna. The patent-pending tunable resonance circuit incorporated on-chip provides optimal signal reception and high sound quality with a short embedded antenna, such as a wire or PCB trace that can be integrated inside the end product casing, enabling FM radio to be added to any portable device without the need for an external headphone cable.

In addition, the Si4705 provides a digital audio interface that allows easy recording of FM radio without the need for external A/D converters, saving power, cost and board space. In addition, it requires 15mm2 of board space. Both devices provide coverage of the expanded worldwide FM frequency band from 64-108MHz.

According to the company, the third-generation Si4708 and Si4709 FM receivers reduce required system board space by 44 percent compared to competing products. The devices require 8mm2 of board space and are packaged in a 2.5mm x 2.5mm QFN package that is easy to assemble and forms solder joints without requiring any under fill or mechanical reinforcement.

For 10,000-unit quantities, the Si4704/05 sells at Rs.101.21 ($2.51) and the Si4708/09 at Rs.94.76 ($2.35). Samples are available now.

- Ismini Scouras

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