STMicroelectronics FDA803D and FDA903D digital-input automotive audio amplifiers

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The FDA803D and FDA903D digital-input automotive audio amplifiers from STMicroelectronics are richly featured to simplify integration in telematics and emergency-eCall equipment, acoustic vehicle alerting systems (AVAS) in hybrid/electric vehicles and high-end infotainment systems.

With I²S and TDM digital-audio inputs and feedback-after-filter topology for low noise and high sound quality, the 45 W class-D amplifiers simplify design. This is combined with I²C automotive-grade diagnostics, including offset and open-load detection in play mode. These integrated features enable certification to the required ISO 26262 ASIL (Automotive Safety Integrity Level). The FDA903D has an additional load-current monitoring feature which allows continuous monitoring of the speaker, thus enabling advanced diagnostics as well as speaker performance enhancement.

By delivering high audio quality with low distortion, the amplifiers can be used for adding extra audio channels to high-end infotainment systems, in addition to being incorporated in safety equipment. They can drive down to 2Ω-load speakers and feature built-in output-power limiting to protect small speakers. Efficiency of up to 90% (4Ω, 1 kHz, 20 W), and high thermal performance from the PowerSSO36 package with exposed underside heat spreader, allows heatsink-free designs that permit small modules and simplify mounting in the vehicle.

The products have a wide supply-voltage range of 3.3 to 18 V, allowing use in a variety of equipment powered from the car battery or other sources. They are tested according to CISPR class V to help ensure compliance with stringent EMC specifications for automotive equipment.

For more information: www.st.com/fdax03d-nb.