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A Single-Chip Solution for Stereo Volume Control

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A CMOS stereo volume control has been designed specifically for digital control of analog audio signals. It features a 3-wire interface that controls two independent audio channels with 95.5 dB of attenuation and 31.5 dB of gain with 0.5-dB resolution. Zipper noise has been virtually eliminated with the implementation of zero-crossing detection. The part achieves a 0.0007% THD over a 20-Hz to 20-kHz bandwidth.

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