Novel ADC for digital microphones

7 April 2004 Analogue, Mixed Signal, LSI

By supporting the full audio band up to 20 kHz, Zarlink's new ultra-low-power mixed-signal A/D converter for digital microphones helps achieve clearer sound quality in cellphones. In addition, the convertor chip enables 'stereo on one wire' capability, with the output signals from two digital microphones in the handset interlaced on a single line. For manufacturers, digital microphones will help reduce power consumption, save space and achieve lower design and component costs by eliminating complex analog components such as preamplifiers and modulators. This chip draws less than 500 µA and measures just 1,96 x 1,05 mm - small enough to produce tiny 4 mm microphones. It employs a 4th-order sigma-delta modulator architecture that provides a wide audio bandwidth, high signal-to-noise ratio and a low noise floor. Zarlink says its proprietory modulator architecture ensures modulator stability, even under acoustic overload conditions.

Memec SA, 011 897 8600

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