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Raise the roof with Wolfson’s DAC for car stereos

Edinburgh, UK —Wolfson Microelectronics plc is addressing the growing in-car DVD player market with a new version of its WM8718 differential stereo digital-to-analog converter (D/A converter), which features improved audio quality and smaller packaging.

Offered in a compact 4mm x 4mm QFN package, the WM8718QFN is meant for size-critical applications. With a 111dB signal to noise ratio ('A' weighted at 48 kHz) and -100dB total harmonic distortion, the device features differential outputs for improved audio quality. Left and right zero flag outputs allow control of external mute circuits. The WM8718QFN is specified for operation over the automotive temperature range of -40 to +85 degrees centigrade.

“Luxury vehicles are increasingly differentiated by in-car entertainment systems. Our new device directly addresses the reliability, performance and size constraints of the automotive industry,” said John Crawford, product manager, Wolfson Microelectronics. “In addition, it includes several key architectural features that improve performance and lower the overall system cost.”

These features include Wolfson's unique linearization scheme, which provides class-leading measured performance. The WM8718's multi-bit sigma-delta architecture makes it less sensitive to clock jitter. Unlike some competitive chips, the Wolfson D/A converter uses a low order modulator that produces less high frequency noise, requiring fewer analog output filter components. The device supports pulse-code modulation (PCM) data input word lengths from 16 to 32-bits and sampling rates of 192 kHz. These features combine to make the WM8718 a class-leading package for its targeted applications.

The WM8718 is available now in a 24-pin QFN package and is priced at $1.23 each in 10,000-piece quantities.

For more information, please call (858) 676-5090 or visit: www.wolfsonmicro.com/

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