The HiAS2001 uses HiWave”s proprietary Audium technology to create the highly power efficient switching audio power amplifier, optimised to operate directly from a low voltage (0.8 – 1.8V) battery source. This means it uses just 25mW to deliver the industry standard typical listening level (68dBC at 1m); a typical Class D amplifier could consume as much as 1000mW.
The device has been designed to deliver greater efficiency in both mains and battery powered speakers and remove the need for heat sinks. It also enables new speaker classes, such as wireless Hi-Fi speakers, to be created. A wireless speaker based on the amplifier, combined with a power-efficient wireless standard and 4 AA batteries would be capable of playing over 220 albums between charges: over four-months of playback.
The IC comes with an auto power save mode that automatically activates when no audio input is received. It delivers 16-bit per channel audio from configurable (left and right) I2S digital inputs and supports a 44.1 to 48kHz range with automatic sample rate adaption. It further integrates an audio signal processing stage for EQ and effects; a 44-step volume control (1.5dB per step); push button, control pin and rotary (volume) inputs; a tuneable bass boost; and click / pop suppression.
Chris Travis, CTO at HiWave said: “Existing switching audio amplifiers, such as Class D topologies, only achieve their claimed efficiencies will full scale sine waves. Conversely, HiWave”s Audium technology is designed to be efficient at normal listening levels; it has a tiny baseline power consumption and exploits the peak-to-average-power-ratio of audio signals to minimise the variable, output-dependent losses too.”
Commenting James Lewis, CEO of HiWave said “We see a large market opportunity for this technology in wireless speakers systems that connect to the PC, home surround sound system or smartphone, as well as greener audio equipment, docking stations and DAB or internet radios.”
Sample quantities of the HiAS2001-QNC-010 are available immediately in a 64-pin QFN package. Volume shipments will begin from March 2012.