STMicroelectronics unveils digital amplifier chip

The STA339BWS is optimised for applications using small, low-cost speakers, such as flat-panel TVs and docking stations.

ST's Sound Terminal digital audio ICs use techniques such as Full Flexible Amplification (FFX) enabling a fully digital stream from sound source to loudspeaker.

In its application, the company said this produces improved audio performance, reduced cost and smaller size.

The STA339BWS combines IP from ST's audio processing and class-D power amplifier ICs into a single chip, and includes advanced features such as Multiband Dynamic Range Compression (DRC).

DRC uses the latest sound-processing algorithms to enhance the performance of low-cost speakers, and also prevents large bass signals from causing vibrations and damaging small speaker units.

Other features include a seven-band equaliser.

By offering two more bi-quads than common five-band equalisers, the STA339BWS is designed to improve speaker response and the shaping of sound effects.

It also offers continuous audio streaming when changing channels or audio sources, which saves muting the output to suppress noise during each transition.

The output is configurable to deliver 2x20W stereo into 8-ohm speakers, or 2.1 channels at 2x10W plus 20W.

This allows one hardware platform to serve several different products.

By combining functions that previously required a multi-chip solution into a single device, the STA339BWS simplifies product design and assembly.

The IC is pin-compatible with existing Sound Terminal ICs for flat-panel TVs, enabling design-in to next-generation products.

It can also be used in docking stations and mid-power home audio equipment.

The STA339BWS is delivered in a compact PowerSSO-36 package.