2.1-MHz class-D amp for automotive audio designs

December 06, 2016 // By Graham Prophet
Texas Instruments presents this four-channel amplifier as delivering high-resolution audio quality in the smallest footprint. The first 2.1-MHz Class-D audio amplifier specifically designed for automotive applications supports high-resolution 96-kHz digital input for high-fidelity audio with low distortion in automotive infotainment

The TAS6424-Q1 enables the use of smaller external filters and eliminates up to 18 external components to reduce system size and cost compared to existing Class-D solutions. With maximum output power of 75W per channel, the device features the highest-available switching rate and is the only audio amplifier that switches above the AM band.


This reduces electromagnetic interference (EMI): switching above the AM band eliminates the need for complex avoidance schemes and eases electromagnetic compatibility (EMC) designs while enabling the system to meet (CISPR) 25 Class 5 EMC requirements. The chip supports low impedance and maintains stable audio playback while driving low impedance loads of 2 Ohms.

With an advanced AC load diagnostics and line driver mode it provides detailed on-chip phase and impedance measurements that designers can use to configure the device with various outputs, such as woofer, tweeter and line-level connections. Enhanced audio quality comes with reduced distortion, better power-supply rejection and dynamic response with high-frequency switching.

An integrated digital-to-analog converter helps deliver a low system output noise of 42 µVrms for automotive designs such as external amplifiers and head units. Better thermal performance reduces power dissipation by as much as 60% compared to Class-AB amplifiers.


TI’s PurePath Console graphical user interface is available to help designers configure the TAS6424-Q1. To simulate and optimize the device, designers can download an IBIS model or request a TAS6424-Q1 evaluation module .


In a PowerPAD thermally enhanced shrink small-outline package (HSSOP) the device is priced at $5.97 (1000).


TI; www.ti.com/tas6424q1-pr-eu