Cirrus Logic Stereo 10-Watt Analog Input Class-D Amplifier Delivers Best-in-Class Distortion, EMI Performance

AUSTIN, Texas—(BUSINESS WIRE)—March 4, 2009— Expanding its portfolio of Class D-based audio amplifier products, Cirrus Logic Inc. (Nasdaq: CRUS) has introduced the CS3511, a stereo 10-watt analog-input Class-D audio amplifier IC ideal for consumer audio applications such as active media speakers, docking stations, hybrid radios, flat-panel displays and mini-shelf home stereo systems.

The CS3511 uses an advanced Delta Sigma modulator with a patented closed-loop architecture and true spread-spectrum switching controller technology to achieve ultra-low distortion and significantly reduced electromagnetic interference (EMI) compared to other stereo 10-watt Class-D amplifier ICs. The spread spectrum switching controller technology enables adaptation to the audio input signal and provides finer resolution compared to traditional pulse-width modulation (PWM) methods. With continuous feedback and feedforward paths that reduce the inherent non-linearity of switching power MOSFETs as well as improve stability at high switching frequencies, the CS3511 is able to achieve best in class total harmonic distortion plus noise (THD+N) performance of 0.025 percent at five watts and 0.019 percent at one watt.

“The CS3511 was designed to provide our customers with a great sounding amplifier that provides the efficiency of Class-D amplification while greatly simplifying the system design challenges associated with EMI,” said Carl Alberty, director of Marketing, Cirrus Logic Mixed Signal Audio Products.

The CS3511 supports single-ended inputs or fully-differential inputs for improved common-mode rejection ratio (CMRR) and operates from single 9 V or 12 V voltage supplies. It also offers built-in protection and error reporting with automatic recovery from over-current, thermal overload and under-voltage conditions.

Pricing and Availability

The CS3511 measures 6 X 6 mm and is available today in a thermally enhanced 32-pin QFN package. It is priced at $1.39 in quantities of 10,000.

Cirrus Logic Inc.

Celebrating its 25th year as a leading fabless semiconductor company in 2009, Cirrus Logic develops high-precision, analog and mixed-signal integrated circuits for a broad range of innovative customers. Building on its diverse analog and signal-processing patent portfolio, Cirrus Logic delivers highly optimized products for a variety of audio and energy-related applications. The company operates from headquarters in Austin, Texas, with offices in Tucson, Ariz., Europe, Japan and Asia. More information about Cirrus Logic is available at

Cirrus Logic and Cirrus are trademarks of Cirrus Logic Inc. All other product names noted herein may be trademarks of their respective holders.


Cirrus Logic Inc.
Bill Schnell, 512-851-4084
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