Stereo DAC Aims At Automobile DVD Players

The WM8718QFN is a smaller, extended temperature range version of a differential stereo DAC used in in-car DVD players. The device is packaged in a 4 mm x 4mm QFN and operates over the automotive temperature range of –40°C to +85°C. Signal-to-noise ratio is 111 dB (A-weighted at 48 kHz) and total harmonic distortion is specified at –100 dB. The device is designed using sigma-delta architecture to make it less sensitive to clock jitter. It also uses a low-order modulator that produces less high-frequency noise, thereby requiring fewer output filter components. The device supports PCM data word lengths from 16- to 32-bits and sampling rates of 192 kHz. Left and right zero-flag outputs allow control of external mute circuits. Price is $1.23 each/10,000. WOLFSON MICROELECTRONICS PLC., San Diego, CA. (858) 676-5090.