Audio processor with Class D codec
19 March 2008
Analogue, Mixed Signal, LSI
The new STA331 from STMicroelectronics is an audio processor based on an ARM7TDMI core, coupled with ST's proprietary FFX (full flexible amplification) digital modulation technology. With integrated, high-efficiency Class D codec, it offers a high level of flexibility that enables it to be used across the full range of consumer audio products, from portable and wireless devices to home theatre and audio systems.
With its low power consumption, processing capability at up to 75 MHz and high audio quality, the STA331 can be used for both portable and stationary applications, with the same chip being used across a range of products such as set-top boxes (STBs), home audio systems, mini and micro component systems, and wireless speakers and headphones. When combined with the STA510F - a new digital power stage designed specifically for FFX drivers - it can drive audio power up to 100 W per channel.
The STA331's analog and digital audio peripherals make it a flexible solution for mid-range sound-processing applications, where product differentiation is critical. The code runs from the embedded RAM, uploaded from external serial Flash memory, and the whole set of audio parameters and functions can be controlled via an I²C interface or through a customisable GPIO interface for standalone operation. Moreover, the widely used ARM7TDMI core allows fast porting of the third-party audio effects that are available for ARM processors.
The STA331 embeds a stereo ADC (analog to digital converter), the FFX PWM (pulse width modulator) and a powerful bridge, in a single package, along with multi-standard digital connectivity and a three-way input selector. Full multiplexing of multiple audio sources is possible.
A complete library of algorithms has been developed to improve the listening experience of both musical and video content. The library includes digital audio processing, such as ST's proprietary Tones Control, WideSurround, StereoEnhancer, intelligent volume control (MDCR), enhanced listening modes (voice and midnight modes), noise reduction and echo cancellation, and loudspeaker and cabinet compensation EQ. Compressed audio algorithm decoders, in addition to common third-party algorithms, are also available.
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