Cirrus Logic Introduces Industry’s Smallest, Low-Power Boosted Smart Audio Amplifier to Support Global Shift to Mobile Stereo - Seite 2

“More and more consumers are turning to their smartphone as a primary device for video streaming, gaming and listening to music – including using speakerphone or loudspeaker mode,” said Carl Alberty, vice president of Marketing, Cirrus Logic. “The sound quality from a phone using the CS35L41 is so impressive that you can leave your portable speaker behind and simply carry one device to enjoy media anywhere you go without compromise.”

The Cirrus Logic CS35L41 boosted amplifier delivers on the ‘big three’ requirements for mobile applications: enriched audio sound, efficient low-power management and a space-saving package. By incorporating features such as advanced battery management and predictive algorithms, the Cirrus Logic smart power amp increases the audio volume when in speakerphone mode, while reducing noise and power consumption, resulting in better battery life and improved talk times.

Audio Performance, Low Power, Small Package

The Cirrus Logic CS35L41 11-volt smart boosted Class D audio amplifier with DSP delivers high-performance audio in a small, low-power package. Design features include:

• Amplifier Performance—The core of the Cirrus Logic CS35L41 features a 5.3-watt digital input, mono Class D amplifier with the lowest noise and idle power consumption in its class. An integrated 11-volt Class H DC-DC converter boosts the supply voltage and maintains higher efficiency than other audio power amplifiers relying on Class G boost regulators. By adaptively tracking the audio level, the Class H boost converter helps improve system efficiency, minimizes power dissipation and preserves battery life.
• Audio Enhancement—Cirrus Logic’s SoundClear Playback software provides the ability to fine tune audio to the specific micro speaker being used in the mobile system. Equalization, compression and psychoacoustic enhancement algorithms improve sound clarity and increase loudness. Playback filtering compensates for the unique frequency response of the speaker, while eliminating pre-ringing found in conventional linear phase filters. This enables audio engineers to get the most out of small speakers and improve the gaming and video streaming audio experience for mobile device users.
• Battery Management—The Cirrus Logic CS35L41 preserves battery life using an advanced battery management system, in addition to its Class H boost and super low 6.7-milliwatt (mW) quiescent current. By predictively managing the demand on the battery, the amplifier is able to maintain maximum loudness and audio quality, while protecting the battery by minimizing battery current draw and eliminating unexpected “brown out” conditions that shut down the phone.

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