TAS6422E-Q1 Digital-Input Class-D Audio Amplifier Texas Instruments TAS6422E-Q1 Digital-Input Class-D Audio Amplifier implements a 2.1MHz PWM switching frequency enabling a cost-optimized solution in a very small PCB size. It also enables full operation down to 4.5V for start/stop events and exceptional sound quality with up to 40kHz audio bandwidth. The device adds EMI management features that include a spread-spectrum to assist in system level EMI challenges.