2.1-channel Class-D amplifier reference design

18 October 2006 Analogue, Mixed Signal, LSI

With the introduction of its CS44130 power stage IC, Cirrus Logic says it is able to provide a complete solution for audio conversion and digital audio amplification.

To eliminate many of the risks and uncertainties of designing digital Class D audio products, the company has made available a reference design for stereo and 2.1 channel applications that gives consumer electronics manufacturers a complete single-source reference solution that it claims meets or exceeds industry benchmarks for audio quality.

Central to the Class D reference design is the CS44600 digital amplifier controller and the new CS44130 quad power stage IC. Offered in a thermally enhanced QFN package (9 x 9 mm), the IC eliminates the need for an expensive, bulky heatsink. The reference design showcases a high-power stereo amplifier in less than 19 cm² of PCB space - ideal for consumer electronic products that demand high quality audio within small product designs.

The CS44130 quad amplifier provides up to 60 W of power and is thermally and electrically self-protected. The outputs can be configured as four half-bridge channels, two full-bridge channels or one parallel full-bridge channel. The CS44130 can achieve system level dynamic range greater than 105 dB, along with superior distortion performance. The power stage's input logic accepts 2,5 V, 3,3 V as well as 5 V control signals, enabling it to also work with other integrated PWM modulators in digital TV and audio/video decoder system processors.

Cirrus Logic's PopGuard technology suppresses pop noise during system start-up and eliminates one large external DC blocking capacitor per channel. The CS44600 digital controller IC incorporates patented power-supply rejection feedback technology, which makes single-ended outputs a practical option and compensates for power-supply noise.

Class D digital audio systems help enable smaller, lighter, more efficient products that waste less power than traditional bulkier and heavier analog amplifiers. Cirrus Logic claims its Class D amplifiers can achieve efficiency of 90%.

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