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Audio ICs simplify signal management in mobile apps

Posted: 11 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:audio IC? consumer electronics? amplifier? codec?

CS42L73 audio ICs

Cirrus Logic Inc. is rolling out a pair of audio ICs targeted for smart phones and mobile consumer electronics applications.

The CS42L73 is a high-quality, ultralow-power audio codec designed for smart phone applications. The CS35L0X is an analog-input, hybrid Class D speaker amplifier for mobile communications and portable devices.

Both products build upon Cirrus Logic's technology in portable audio products and help solve multiple system challenges encountered by designers in the areas of extending battery life, improving audio quality, simplifying signal management and reducing EMI, while enabling smaller form factors, according to Cirrus Logic.

"Our strategy is to continue to develop innovative products, such as the CS42L73 and CS35L0X, that solve real problems for smart phones and portable devices, especially in areas such as lowering system power while retaining high audio quality," said Jason Rhode, president and CEO of Cirrus Logic, in a statement.

The CS42L73 codec allows smart phones to conserve energy and extend battery life by offloading audio-related tasks, such as signal routing and processing, typically reserved for the applications processor. The CS42L73 is available today and is also featured on the XMM Gold 6260 reference design from Infineon Technologies AG.

The CS42L73 features two ADCs and four DACs based on an advanced, high-quality, multibit Delta Sigma architecture. The DACs can drive five outputs, including ground-centered stereo Class H headphone and line drivers, an ear-piece driver and a low EMI hands-free speaker driver, the company said. The analog front-end supports both line and microphone inputs with both programmable gain amplifiers and automatic level control, Cirrus Logic said.

To meet the challenges of delivering high-quality audio in a mobile handset application while keeping noise and power consumption low, Cirrus Logic said it has also developed the CS35L00 (+6/+12dB gain), CS35L01 (+6dB gain), and CS35L03 (+12dB gain) hybrid Class D audio amplifiers. Using a closed-loop Delta Sigma architecture and patent-pending hybrid Class D technology, the amplifier family combines Class D efficiency and output power with low idle current consumption and minimal EMI found typically only in class AB amplifiers.

The CS35L00 family of amplifiers consumes only 0.9mA of quiescent current, which is 40 percent less than the nearest competitor.

The CS42L73, which is provided in a 64-ball WLCSP package, is available in volume production and priced at $1.95 in quantities of 10,000, Cirrus Logic said. The CS35L00 is available in a 10-pin DFN package and the CS35L01/03 are available in a 9-ball WLCSP package, and are pin compatible, the company said. The CS35L00 is priced at 35 cents per unit in quantities of 10,000 and the CS35L01/03 are priced at 32 cents in quantities of 10,000.

- EE Times





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