Low power ANC ICs improve listening quality in mobile accessories
May 04, 2010 // Paul Buckley
Austriamicrosystems has released a duo of active noise cancelling (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 industry's lowest BOM cost and low power consumption through a high level of functional integration.
The AS3410 ANC IC is ideally 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 cancelling capabilities but with a more complex design. Both devices include; mic pre-amps, filter op amps, true ground headphone amp, 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 Active Noise Cancellation ICs provide a level of performance unmatched by competitive solutions with >20 dB noise reduction achievable and SNR of >100 dB 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 eTablets.
Availability and Pricing
The AS3410 is available in a 24-pin 4x4 mm QFN package and is priced at 2.55 US Dollars for 1000 piece quantities. The AS3430 is housed in a 32-pin 5x5 mm QFN package and is priced at 4.55 US Dollars for 1000 piece quantities. Both operate from a 1.0 to 1.8 V supply over a temperature range of -20 to +85 degrees C.
Related link: AS3410/30 Active Noise Cancellation ICs
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