Digital-Input Audio Amplifiers with Automotive Diagnostics


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Digital-input automotive audio amplifiers

STMicroelectronics introduced two new digital-input automotive audio amplifiers - FDA803D and FDA903D to simplify integration and maximize reliability in telematics and emergency-eCall equipment, Acoustic Vehicle Alerting Systems (AVAS) in hybrid/electric vehicles, and to enhance high-end infotainment systems.


These 1x45W class-D amplifiers features I2S and TDM digital-audio inputs and feedback-after-filter topology for low noise and high sound quality. In addition, it comprises full I2C automotive-grade diagnostics including unique offset and open-load detection in play mode; the FDA803D and FDA903D realize the next generation of amplifiers for cost-effective essential safety equipment. Thanks to these integrated features, they simplify certification to the required ISO 26262 ASIL (Automotive Safety Integrity Level), too.


The FDA803D and FDA903D amplifiers deliver high audio quality with low distortion, also making it suitable for adding extra audio channels to high-end infotainment systems, in addition to being used in safety equipment. They can drive down to 2Ω-load speakers and feature built-in output-power limiting to protect small or low-cost speakers. Efficiency of up to 90% (4Ω, 1kHz, 20W), and high thermal performance from the PowerSSO36 package with exposed underside heat spreader, allow heatsink-free designs that permit smaller modules and simplify mounting in the vehicle.


The devices have a wide supply-voltage range of 3.3V to 18V, allowing it to be used 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.


The FDA903D also comes with load-current monitoring feature, which ensure continuous monitoring of the speaker thus enabling advanced diagnostics as well as speaker performance enhancement. The devices extend ST’s FDA family of robust full-digital audio amplifiers for automotive applications, which includes 2-channel and 4-channel devices up to 4x135W with features for reliable diagnostics and ST’s innovative feedback-after-filter concept.


Production samples of both devices are available now. Budgetary pricing for orders of 1000 pieces is $2.60 for the FDA803D and $2.80 for the FDA903D.

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