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Class-D audio amp equipped with DAC noise filter

Posted: 05 Feb 2010 ?? ?Print Version ?Bookmark and Share

Keywords:Class-D audio amplifier? DAC? noise filter?


From Texas Instruments Inc. comes a 3.2W, mono Class-D audio amplifier with an integrated DAC noise filter that reduces codec noise by as much as 82 percent, compared to devices without this feature.

The TPA2011D1's integrated noise filter could eliminate the need for an external filter on the inputs, reducing component count and cost. The Class-D amplifier's 1.2mm x 1.2mm package size makes it 25 percent smaller than competing devices, further saving space for designers who are looking for 0.4mm pitch for next-generation mobile phones and portable media players.

The TPA2011D1 features 3.2W into 4?, at 5V, which produces 22 percent louder audio than competing solutions with no audible pop, a common challenge in portable devices. The amplifier also packs image reject filter that provides a low-pass cutoff frequency of 130kHz, which could eliminate the need for an external filter on the inputs for lower component count and cost.

The device is housed in 1.2mm x 1.2mm, 0.4mm pitch 9-ball WCSP, which saves board space and simplifies design. In addition, the TPA2011D1's 1.5mA quiescent current results in 50 percent lower power than other amplifiers for higher battery efficiency and improved battery life.

The TPA2011D1 is priced at $0.85 in 1,000-unit quantities. Additional members of the TPA2011D1 family, the TPA2037D1 and the TPA2039D1, are also available for sampling and production now.

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