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New Products
October 17, 2012
ST Brings Digital Amplifiers to the Dashboard
STMicroelectronics has revealed the first full-digital audio-amplifier system-on-chip family suitable for use in dash-mounted sound-system control panels in the car.
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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.
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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.
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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.
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