Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Amplifiers/Converters

Stereo codec packs Class D speaker driver

Posted: 25 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:stereo codec? Class D speaker? amplifier?

Wolfson Microelectronics has releases the second device in its stereo chip line is being promoted as the industry's lowest power codec.

Designed to extend playback time for audio enabled portable devices, the WM8961 builds on the foundation of Wolfson's WM8903 codec, packing in the same technology along with an additional integrated high power Class D stereo speaker driver. This enhancement extends the company's low power audio products into applications that require high performance speaker driver functionality, including mobile Internet devices, handheld gaming and portable media players.

The WM8961's integrated charge pump provides a ground-referenced output when driving headphone loads. This removes the need for DC-blocking capacitors and enables savings in PCB space and the audio subsystem BOM. The WM8961 also uses Wolfson's proprietary Class W amplifier technology, featuring an adaptive dual drive charge pump and DC servo circuit architecture. This intelligently optimizes efficiency and power consumption during playback and enables the headphone amplifier to deliver up to 30mW into a 16? load at 1 percent THD+N.

The WM8961's stereo filter-less class D speaker driver provides 1W per channel into 8? loads at power supply rejection ratio and pop/click suppression mechanisms also allow direct battery connection to the speaker supply. Flexible speaker boost settings allow speaker output power to be maximized while minimizing other analog supply currents.

The WM8961 is sampling now in an ultrathin 32-pin 5mm x 5mm x 0.9mm QFN package. Pricing starts at $1.95 in 1000K volumes.

- Ismini Scouras

Article Comments - Stereo codec packs Class D speaker d...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top