A novel audio playback chip using digitally driven speaker architecture with 80%@-10dBFS power efficiency, 5.5W@3.3V supply and 100dB SNR

A novel audio playback chip using digitally driven speaker architecture based on a delta-sigma modulator and newly proposed high-order mismatch shaper with novel dither circuit is presented. It can realize 5.5W output power into 4Ω speakers with only 3.3V power supply. The power efficiency from -10dBFS to 0dBFS is higher than 80%. The efficiency at low power output can realize long battery life. This chip can realize battery powered high-fidelity and high-power audio system.