A multibit delta-sigma audio DAC with 120-dB dynamic range |
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Authors: | Fujimori I Nogi A Sugimoto T |
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Affiliation: | AKM Semicond., San Diego, CA; |
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Abstract: | A 24-bit 192-kHz sample-rate digital-to-analog converter (DAC) achieves 120-dB A-weighted dynamic range in the 20-kHz band, and consumes 310 mW with a 5-V power supply. A third-order five-bit ΔΣ architecture optimized for high-end consumer audio has been developed and used. A switched-capacitor (SC) DAC combined with infinite-impulse response (IIR) and finite-impulse response (FIR) filters is employed to increase immunity to clock jitter, and reduce analog power. Partial-range dynamic element matching (DEM) enhances mismatch shaping with reduced circuit overhead. The 7.8-mm2 chip fabricated in 0.5-μ m CMOS integrates a stereo DAC and all functions required for DVD-audio playback |
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