Wireless headsets, which may be linked over the air to devices such as mobile phones and portable media players, are often used in noisy environments such as cars, aeroplanes, office buildings and public places. The successful implementation of ANC dramatically reduces the perceived volume of external noise, enabling the desired receive-path audio signal to be heard against a nearly silent background.
Headset users can therefore hear speech more clearly on voice calls and benefit from improved intelligibility; enjoy the full dynamic and frequency range of reproduced music at a comfortable playback volume; concentrate for longer periods of time and benefit from a less tiring and stressful listening experience.
Single-chip ANC solutions with integrated speaker driver ICs process external noise sensed by a microphone embedded in the headset, and generate a noise-cancelling signal, while amplifying the desired audio signal with very low levels of distortion.
Low power consumption and long battery life are particularly important requirements in wireless headsets, and the all-analog design of the AS3421/22 is markedly more efficient than DSP-based (digital) speaker driver ICs. The devices draw just 7 mA at 1,5 V in stereo ANC mode, and <1 μA in quiescent mode. They also implement an ultra-low power ANC-bypass mode when the user selects the playback-only function.
In addition, the devices offer fully differential stereo line inputs to match the differential line outputs from typical Bluetooth-based headset systems-on-chip, combining audio quality with high-performance noise reduction of typically more than 25 dB.
The AS3421 is housed in a 4 x 4 mm QFN24 package while the AS3422 uses a 5 x 5 mm QFN32 package.
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