STMicroelectronics rolls new audio amps for automotive

GENEVA--STMicroelectronics on Tuesday (Oct. 16) announced what it claims is the industry's first full-digital audio-amplifier system-on-chip family for in dash-mounted sound-system control panels in the car.

ST's new audio amplifiers 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.

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.

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. ST features a feedback loop that saves the need for a large output filter, and also allows use in diverse OEM and aftermarket products by reducing dependence on speaker type.

Features:

• 4-ohm, 2-ohm or 1-ohm 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 cost $9.00 and $8.00, respectively, in quantities of 1,000 pieces. Alternative pricing options for higher order quantities will be available on request.

For more information visit STMicroelectronics' audio amplifier page.