Digital audio amps improve bass response

Texas Instruments Inc. has released two digital-input audio power amplifiers that combine 32 bits of advanced audio processing with 20W of stereo output power into a single device.

The TAS5709 and TAS5710 support speaker equalization (EQ) and dual-band dynamic range control (DRC) and offer TI's 3D and bass boost technology, which enhances the overall sound experience by widening the sound stage and improving bass response. The TAS5710 features TI's closed-loop architecture, which produces a rich, natural sound and lowers system cost by relaxing power supply performance requirements in consumer audio products, including high-definition Vs, media docking stations, digital radios and sound bars.

"PURE has consistently provided low power, integrated digital audio products that deliver great sound. TI's closed loop amplifier with advanced on-chip audio processing enables us to offer high quality audio within our latest Clearsound platform," said Colin Crawford, director of marketing for DAB digital radio manufacturer PURE.

The TAS5709 and TAS5710 pack up to nine biquad filters per channel that equalizes speaker performance and compensates for less than ideal enclosure acoustics. The devices feature dual-band DRC with selectable threshold, attack and decay that protects speakers from damage and stops "bass rattling" of the cabinet/enclosure. The audio amps also store up to three sets of biquad coefficients for optimum audio performance over varying audio input frequencies. Sample rate changes are automatically detected and the correct coefficients selected without user intervention. In addition, the 2-channel I?S input provides a direct connection to the digital processor, which reduces BOM cost

The TAS5709 and TAS5710 are available, along with the TAS5707 and TAS5708 digital-input audio power amplifiers which support multiple levels of audio processing. Pricing for the single-band TAS5707 and TAS5708 are $2.30 and $2.55, respectively. Pricing for the dual-band TAS5709 and TAS5710 are $2.40 and $2.65, respectively.