TAS6424R-Q1 Digital-Input Class-D Audio Amplifier Texas Instruments TAS6424R-Q1 Digital-Input Class-D Audio Amplifier implements a 2.1MHz PWM switching frequency, enabling a cost-optimized device in a tiny PCB size. The device also has full operation down to 4.5V for start/stop events and exceptional sound quality with up to 40kHz audio bandwidth. The output switching frequency can be set above or below the AM band. Above the AM band eliminates AM-band interferences and reduces output filtering and cost. Below the AM band can help optimize efficiency.