Class-D Digital Amplifier ICs optimize in-car audio.

Press Release Summary:

Featuring integrated digital input, 4 x 135 W Model FDA4100LV and 4 x 50 W Model FDA450LV require no signal conversion or filtering circuitry. Devices provide 4, 2, and 1 Ω speaker driving capability, with SNR ratio of 110 dB and 108 dB dynamic range. Feedback loop allows use in OEM and aftermarket products by minimizing dependence on speaker type. Tested for compliance with automotive EMI standards, ICs are stop-start engine compatible and include I2C interface for digital control and diagnostics.

Original Press Release:

ST Innovation Brings Digital Amplifiers to the Dashboard for Better In-Car Audio, Energy Efficiency and Space Savings

Full-digital amplifier family begins with 4x135W and 4x50W systems on chip, enabling a new generation of class-D car audio products

Geneva, – STMicroelectronics (NYSE: STM), a global semiconductor leader serving customers across the spectrum of electronics applications and the world’s leading supplier of automotive audio power amplifier chips[1], has revealed the industry’s first full-digital audio-amplifier system-on-chip family suitable for use in dash-mounted sound-system control panels in the car.

Class-D amplifiers achieve about 80% higher energy efficiency than analog class-AB amplifiers. This greater efficiency helps reduce the electrical load on the alternator and can allow extra functions or speaker channels within standardized enclosure dimensions. Historically, cost, pc-board size and EMI issues have confined automotive class-D applications to high-power booster amplifiers. Overcoming these barriers, ST’s full-digital amplifier ICs now allow popular in-car equipment to deliver powerful high-quality audio experiences.

ST’s new audio amplifiers also enhance the audio performance of high-power boosters and integrate circuitry to allow continuous, undistorted playback in vehicles using stop-start engine technology, or in hybrid vehicles as the electrical traction drives and combustion engine switch between various operating modes.

As the first devices of their kind to feature an integrated digital input, the 4x135W FDA4100LV and the 4x50W FDA450LV require no signal conversion or filtering circuitry, saving pc-board space and component count. In addition, engineering challenges such as EMI reduction are addressed inside the chips. ST’s patented feedback loop saves the need for a large output filter, and also allows use in diverse OEM and aftermarket products by reducing dependence on speaker type. Patented features reduce electro-magnetic interference with the tuner and also simplify end-product certification to automotive electromagnetic compatibility (EMC) standards CEI EN 55025 and ISO 11452-2 (2004).

ST has also indicated plans to expand its FDA full digital amplifier family in the future, starting with a 2-channel device early in 2013.

Major features:

• 4x135W maximum output power (FDA4100LV) or 4x50W (FDA450LV)

• 4Ω, 2Ω or 1Ω speaker driving capability

• Unique digital audio input for automotive application

• Input signal-to-noise ratio and dynamic range: 110dB / 108dB

• Patented feedback loop design, saving cost and component count

• Integrated step-up driver (FDA4100LV)

• Tested for compliance with automotive EMI standards

• I2C interface for digital control and diagnostics

• Stop-start engine compatible

The FDA4100LV and FDA450LV are available in volume at a unit price of, $9.00 and $8.00, respectively, in quantities of 1,000 pieces. Alternative pricing options for higher order quantities will be available on request.

About STMicroelectronics

ST is a global leader in the semiconductor market serving customers across the spectrum of sense and power technologies and multimedia convergence applications. From energy management and savings to trust and data security, from healthcare and wellness to smart consumer devices, in the home, car and office, at work and at play, ST is found everywhere microelectronics make a positive and innovative contribution to people's life. By getting more from technology to get more from life, ST stands for life.augmented.

In 2011, the Company’s net revenues were $9.73 billion. Further information on ST can be found at

For Press Information Contact:


Michael Markowitz

Director Technical Media Relations

+1 781 591 0354

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