An FPGA-based re-configurable 24-bit 96kHz sigma-delta audio DAC

This paper presents a reconfigurable sigma-delta audio Digital-to-Analog Converter (DAC) which is suitable for embedded FPGA applications. The Sigma-Delta Modulator (SDM) design can be configured as a 3rd or 5th order SDM and allows different input word lengths. Different input sampling rates are also entertained by employing a programmable interpolator. The DAC accepts 16-/18-/20-/24-bit PCM data at sampling rates of 32/44.1/48/88.2/96 kHz for applications in CD, SACD and DVD audio.