STMicroelectronics Launched Automotive Audio Amplifier Chips
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Update time : 2022-12-08 15:45:36
December 7, 2022 - ST announces automotive audio amplifier chips that bring flexible digital signal processing to emergency response, telematics and AVAS.
These amplifiers integrate an I2S front-end circuit, a digital core, a 100dB resolution 24-bit digital-to-analogue converter (DAC) and a Class D PWM output stage. The on-chip integrated digital audio processor ensures that the amplifier achieves high sound quality in a small footprint. The internal feedback circuitry is placed in front of an external L-C output filter, simplifying circuit design and saving space.
Both amplifiers have full I2C configuration and in-run diagnostics including clipping detection, overheat warning, overcurrent protection and open load detection to minimise external component and bill of materials costs. the FDA903S also incorporates a real-time load current monitor to enable self-diagnostics to meet ASIL Class A safety requirements for functional safety applications.
Both devices are available in a QFN32 5mm x 5mm exposed lower pad package, allowing for a compact and cost effective pure digital design without the need for heat sinks. The low device count and heat sink-free solution minimises the size of the power amplifier. Product benefits such as low quiescent current, compactness, light weight and low power consumption contribute to the overall energy efficiency of the vehicle.
Both the FDA803S and FDA903S have an I2S digital input and time division multiplexing (TDM) interface with sampling frequencies that can be set between 8kHz and 96kHz to optimise the amplifier's performance when connected to a variety of sources. low sampling frequencies of 8kHz to 32kHz allow designers to save memory capacity in applications such as warning tone generators.
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