STMicroelectronics HFDA801A audio amplifier

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The HFDA801A from STMicroelectronics is a high-resolution audio amplifier that is specifically designed for compact automotive applications.

The product is a 2 MHz switching pulse-width modulation (PWM) Class-D amplifier with a quad-bridge configuration. An integrated high-performance digital-to-analog converter (DAC) enables hi-fi quality sound under any load condition, with noiseless turn-on/turn-off and without creating any output artefacts. With a signal-to-noise ratio of 121 dB, 120 dB dynamic range and 10 μV output noise, the device delivers a high level of audio performance from a small form-factor component.

The feedback configuration with integrated L-C low-pass filter provides an ultrawide flat frequency response up to 80 kHz and minimises dependence on external components. The wide bandwidth allows use in high-definition (HD) audio applications, letting designers rely on good linearity and low distortion that are independent of the inductor and capacitor quality.

The specific architecture implemented derives all required voltages internally, enabling the device to draw its supply from the vehicle battery without the need for additional power converters. The amplifier benefits from a wide range of load capabilities, for stable performance even while driving high power on low-impedance loads of 2Ω on all four channels.

By integrating in-play diagnostics as well as a digital impedance meter and real-time load-current monitor, the product can be used in safety-related audio applications that must demonstrate ASIL compliance, such as acoustic vehicle alerting systems (AVAS).

For more information: www.st.com/hfda801a.