Date: 12/01/2009

Digital audio IC packs DSP and amplifier

ST Microelectronics has introduced a combined audio processing and amplifier chip STA339BWS for applications using small, low-cost speakers, such as flat-panel TVs and docking stations.

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 important features include a seven-band equalizer. By offering two more bi-quads than common five-band equalizers, the STA339BWS improves speaker response and shaping of sound effects. A further advantage is 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 flexibility allows one hardware platform to serve several different products.

The new IC is also pin-compatible with existing Sound Terminal ICs for flat-panel TVs.
Package: PowerSSO-36 package,
Price: $2.50 each in quantities of 10,000 units.