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A Dual Monolithic 18-Bit Analog-to-Digital Converter for Digital Audio Applications

A dual 18-bit successive approximation CMOS analog-to-digital converter is described with serial data outputs for digital audio applications. The dual a/d converters employ the switched capacitor architecture which also provides an inherent co-phase sample/hold operation for each channel. This low power circuit includes a low-noise band-gap reference and reference buffer amplifiers to drive each of the CDACs. Fast-settling circuits, including latching comparators, permit conversion rates of 1x, 2x or 4x oversampling. Laser trimming of a -trim-DAC- produces performance levels of 0.0025% THD+N and 92dB SNR.

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