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
- 4-ohm, 2-ohm or 1-ohm speaker driving capability
- Unique digital audio input for automotive
- Input signal-to-noise ratio and dynamic range:
110dB / 108dB
- Patented feedback loop design, saving cost and
- Integrated step-up driver (FDA4100LV)
- Tested for compliance with automotive EMI
- I2C interface for digital control and
- 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.