Stereo DAC adapts to automotive needs

A new version of the WM8718 differential stereo DAC comes in smaller packaging and has an extended operating temperature range to address the in-car DVD player market.

Wolfson Microelectronics is addressing the growing in-car DVD player market with a new version of its highly successful WM8718 differential stereo DAC, in smaller packaging and specified over an extended operating temperature range.

Offered in a compact 4 x 4mm QFN package, the WM8718QFN is ideal for size-critical applications.

With a 111dB signal to noise ratio (A-weighted at 48kHz) 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 +85C.

"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 include Wolfson's unique linearisation scheme which provides class-leading measured performance.

The WM8718's multibit sigma-delta architecture makes it less sensitive to clock jitter.

Unlike some competing chips, the Wolfson DAC uses a low-order modulator that produces less high frequency noise, requiring fewer analogue output filter components.

The device supports PCM data input word lengths from 16 to 32bit and sampling rates of 192kHz.

These features combine to make the WM8718 a class-leading package for its targeted applications.

The WM8718 is available now in volume quantities in a 24-pin QFN package.

The existing 20-pin SSOP device will continue to be available alongside the new version.

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