High-fidelity 175W Class D audio amplifier reference design with digital input and processing

This design uses the highly flexible PCM5242 differential output DAC to convert the extremely high performance analog input TPA3251D2 Class D amplifier into a digital input system with audio processing capabilities. The full performance of the TPA3251D2 amplifier can now be achieved through a variety of digital input sources. The PCM5242 DAC's analog differential output and high SNR are a perfect match for the TPA3251D2 amplifier's full differential analog input, resulting in excellent noise performance and very low distortion. Through the miniDSP on the PCM5242, audio processing and filtering functions can be added to further enhance the audio performance in the end device.

characteristic

• ● Achieve high performance and audio fidelity from TPA3251D2 using digital sources
• ● Accepts digital input in USB, optical, SPDIF and I2S formats
• ● Output 175W from digital source at 10% THD + N
• ● Provides 10W output with less than 0.004% THD + N into a 4 ohm load
• ● MiniDSP processing flexibility using PCM5242 DAC
• ● Noise suppression via fully differential analog channels