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ANC ICs enhance mobile headphone listening

Posted: 31 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:active noise canceling? ANC IC? mobile headphone? amplifier?


austriamicrosystems is rolling out a duo of active noise canceling (ANC) ICs for mobile accessories such as headphones.

The fully analog devices enhance speech or music intelligibility by reducing low frequency noise on the receive path. The AS3410 and AS3430 claim the lowest BOM cost and low power consumption through a high level of functional integration.

The AS3410 ANC IC is suited for feed-forward topology enabling small, cost-effective solutions targeting on-ear and in-ear devices. The AS3430 addresses feedback topologies resulting in end products with superior noise canceling capabilities but with a more complex design.

Both devices include; mic pre-amps, filter op amps, true ground headphone amplifier, mic gain calibration, LED driver, volume control and an assisted hearing mode. These features enable PCB space savings of up to 50 percent as compared to discrete implementations.

The AS3410 and AS3430 ANC ICs provide a level of performance unmatched by competitive solutions with >20 dB noise reduction achievable and SNR of >100dB and THD of 0.1 percent. Running off a single AAA battery these devices support operating life of >100 hours, making them well-suited for headsets for mobile phones, music players, netbooks and e-tablets.

The AS3410 is available in a 24-pin 4mm x 4mm QFN package and is priced at $2.55 for 1,000-piece quantities. The AS3430 is housed in a 32-pin 5mm x 5mm QFN package and is priced at $4.55 for 1,000-piece quantities. Both operate from a 1V to 1.8V supply over a temperature range of -20C to +85C.

- Paul Buckley
Audio DesignLine

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