By Carolyn Mathas, contributing writer
Cirrus Logic announced that its CS35L41 smart power amplifier is the industry’s smallest low-power boosted solution. The amplifier, supporting stereo audio in smartphones and portable devices, housed in a 5.64-mm2 WLCS package, is approximately half the size of DSP smart amps.
Features include an integrated DSP and fifth-generation enhancement and protection algorithms for improved audio quality without overworking the application processor or external DSP. Speaker-protection algorithms come into play while driving the speaker to the max, resulting in high output power while protecting the speaker. This enables OEMs to achieve an improved audio experience in mono and stereo applications while conserving battery life.
The CS35L41 addresses amplifier performance, audio enhancement, and battery management, minimizing power consumption and battery current while maintaining audio performance. The CS35L41 offers the lowest power consumption, lowest noise, and smallest package size of any amplifier in its class, according to Cirrus Logic.
Amplifier performance: 5.3-W digital input, mono Class D amplifier with an integrated 11-V Class H DC/DC converter that improves system efficiency, minimizes power dissipation, and preserves battery life.
Audio enhancement: Cirrus Logic’s SoundClear Playback software provides fine-tuning to the specific mobile-system speaker. Equalization, compression, and psychoacoustic enhancement algorithms improve sound clarity and increase loudness. Playback filtering compensates for the unique frequency response of the speaker, eliminating pre-ringing found in conventional linear phase filters.
Battery management: Battery life is preserved via Class H boost and super-low 6.7-milliwatt (mW) quiescent current and predictive battery management. Managing battery demand enables maximum loudness and audio quality without unexpected “brown-out” conditions. The battery management system adapts to conditions, protecting the battery and mobile system, yet enabling volume and maintaining quality.
The CS35L41 is shipping in production volumes. Tuning tools enable high-end as well as mid- and low-cost designs.
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