Cirrus Logic Inc. (Cirrus Logic), a fabless semiconductor company, has introduced a new stereo 10-watt analog-input Class-D audio amplifier IC, CS3511, to its Class D-based audio amplifier products. The new IC is suitable for consumer audio applications such as active media speakers, docking stations, hybrid radios, flat-panel displays and mini-shelf home stereo systems. The CS3511 measures 6 X 6 mm and is available in a thermally enhanced 32-pin QFN package.

The CS3511 uses an advanced Delta Sigma modulator with new 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.