Amplifiers Bring Clear Sound For Automotive e-Call


Car audio amplifiers offer high audio quality for e-call and telematics systems 

The vehicle telematics and emergency call (e-call) market are expanding at a fast pace to keep up with consumer expectations of safety, comfort and options. These emerging applications generate unique requirements for the audio subsystem.

In response to this, ST is offering audio system makers the new FDA803D and FDA903D digital-input automotive audio amplifiers that claim to simplify integration and maximize reliability in telematics and emergency-eCall equipment, Acoustic Vehicle Alerting Systems (AVAS) in hybrid/electric vehicles, and high-end infotainment systems.

Car audio amplifiers with digital input and diagnostic functions


ST claims that the new 1x45W class-D amplifiers simplify design and save BOM costs with I2S and TDM digital-audio inputs and feedback-after-filter topology for low noise and high sound quality.

They also offer full I2C automotive-grade diagnostics including unique offset and open-load detection in play mode, to enable 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 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, ST said.

By delivering high audio quality with low distortion, the FDA803D and FDA903D 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 or low-cost speakers.

The devices claim an efficiency of up to 90% (4Ω, 1kHz, 20W) and high thermal performance to allow heatsink-free designs that permit smaller modules and simplify mounting in the vehicle.

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A wide supply-voltage range of 3.3V to 18V, allows 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.


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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