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Flexible Class AB/D speaker driver suits portable apps

Posted: 14 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Class AB/D speaker driver? portable application? DAC?

Wolfson Microelectronics plc has introduced the WM9001 mono 1W switchable Class AB/D speaker driver designed to deliver enhanced flexibility to portable applications system designers.

User selectable features such as class D or AB output modes, single ended or differential input modes, device clocking and speaker boost gain can all be configured by the system designer for application optimization.

Moreover, small device footprint allows placement close to the speaker housing, enabling simplified 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. Additionally, 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/click suppression enable the

speaker supply to be connected directly to the battery without compromising battery life or audio quality.

"The WM9001 is a flexible class AB/D speaker driver solution with integrated pop and click suppression circuitry. This provides system designers with maximum flexibility in diverse portable media devices to

enhance the multimedia experience with high performance audio and voice quality while reducing system cost and PCB area," said Richard Potter, product line manager for mobile handset products.

WM9001 also connects seamlessly 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. The WM9001 can easily connect to Wolfson's portfolio of high performance, low

power audio CODECs and DACs, bringing quality speaker drive performance to portable applications.

WM9001 is available for sampling in small, low profile 3x3mm QFN-16 and 1.64x1.64mm CSP package options, suited for space constrained applications such as mobile phones, navigation devices, media players, laptops and electronic dictionaries.




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