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Portable audio codec 'first' to integrate FM transmitter

Posted: 17 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:audio amplifier? portable audio codec? integrated FM transmitter?

Leadis Technology Inc. has unveiled its latest family of audio codecs incorporating advanced FM transmitters and its Gmax audio amplifier technology, maintains best-in-class SNR and extends battery life in portable audio applications.

Well suited for smart mobile phone, MP3/PMP, portable gaming, GPS/PND and digital still camera products, the LDS9350, LDS9302, LDS9302L and LDS9200 devices are available now in production quantities.

"Our line of Gmax-enabled codecs with integrated FM transmitters requires only 4mW of power for quiescent playback," said Greg Davis, senior director of audio business unit at Leadis. "More importantly, our Gmax amplifier technology really shines when comparing power consumption at average listening levelssomething few chip manufacturers are willing to disclose. We specify power consumption at average listening levels to provide a real world estimate of battery life and to demonstrate the significant power saving capability of the Gmax amplifier technology. This translates to 70 percent lower system power consumption at typical listening levels and more than doubles the battery life of high fidelity audio playback."

The LDS9350 integrates a stereo FM transmitter, a low power and low noise stereo audio codec, a Gmax stereo headphone amplifier, DC/DC converter and PLL in a single compact solution.

Leadis also offers CODEC-only versions, the LDS9302 (3.3V) and LDS9302L (1.8V single-supply) and a standalone FM transmitter, the LDS9200.

Fresh solution
The 3.3V 2-channel 24bit DAC exceeds portable audio noise requirements with an SNR of up to 102dB and can operate with sampling rates between 8-192ksps. The codec has multiple analog inputs including stereo microphone, stereo line and a fully differential microphone. Other features include a PLL, programmable gains, microphone bias and a low-power analog bypass mode. The codec also features a high fidelity stereo audio Gmax headphone amplifier. Design innovations reduce system parts count and BOM cost while providing programmable control features for optimal audio quality.

The LDS9350 and LDS9200 provide an FM transmitter function fully programmable via I?C interface with few external components. FM radio bands are selectable for worldwide operation: 87.5-108MHz for the United States and Europe, and 76-90MHz for Japan. Pre-emphasis and transmit power levels are addressable to meet country-specific regulatory standards. Advanced digital radio techniques deliver professional FM broadcast audio quality. Audio to the transmitter can be digital via I?S or analog via stereo line-in or microphone inputs.

The highly integrated architectures include an on-chip DC/DC converter which can be configured to generate system voltages and eliminate the need for external voltage regulators.

The devices are available now in mass production. All are packaged in a standard 40-pin 6mm x 6mm QFN, as well as ultrasmall CSP packaging. Single-unit pricing for 1,000-piece purchases is $2.93 for the LDS9350 and $2.38 for the LDS9302/L, and $1.95 for the LDS9200. An immediately available turnkey evaluation module includes a PC-based interface for easier programming and reducing time to market.




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