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Class AB/D speaker driver fits space-constrained apps

Posted: 18 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Class AB speakers? Class D speaker driver? space-constrained applications?

Wolfson Microelectronics plc has introduced the WM9001 mono 1W switchable Class AB/D speaker driver in a low-profile 3mm x 3mm QFN-16 or 1.64mm x 1.64mm CSP package, making it suitable for space-constrained applications such as mobile phones, navigation devices, media players, laptops and electronic dictionaries.

Touting exceptional audio performance and flexibility, the WM9001 offers user selectable features including class D or AB output modes, single-ended or differential-input modes, device clocking and speaker boost gain, which can all be configured by the system designer for application optimization.

In addition, the small device footprint allows for placement close to the speaker housing, simplifying PCB layout and maintaining signal integrity by minimizing high-frequency signal track lengths. Audio performance is enhanced through differential input and output modes to remove undesired noise, and RF noise suppression is improved and external component count reduced by an integrated oscillator for clocking the class D outputs. Low leakage, high PSRR and pop-and-click suppression enable the speaker supply to be connected directly to the battery without compromising battery life or audio quality, said Wolfson.

The WM9001 also connects easily with both the WM8990 audio hub codec and the new WM8400 audio and power management IC, enabling a full stereo 1W class AB/D speaker drive solution for multimedia-rich mobile handsets.

Pricing is 45 cents in quantities of 10,000. Samples are available.

- Gina Roos

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