The AS3412 logs on as a compact, cost-effective speaker driver that promises to bring the benefits of Active Noise Cancellation (ANC) for the first time to mass-market headsets. Noise cancellation performance is quoted as being up to 30 dB of external noise attenuation over an audible frequency range of 20 Hz to 2 kHz. The 2.2 mm x 2.2 mm x 0.4 mm chip-scale package combines ANC circuitry with a speaker driver capable of driving 2 x 34 mW into a 32Ω load. Operating from a 1.6V to 1.8V power supply, the IC is also compatible with USB Type-C and with Lightning interfaces. Supported by an easy-to-use development kit including a software GUI, firmware and simulation environment, the compact AS3412 only requires a small number of supporting components including a filter network composed of low-cost capacitors and resistors. Other features include an integrated depletion-mode MOSFET that provides a bypass function. This eliminates the need for a bulky bypass switch, enabling the speaker driver to continue to provide an audio output even when there is insufficient battery power remaining to support the ANC function. Additionally, typical power consumption in normal feed-forward operation with a 260-µA load for twin microphones is 11.5mW, signal-to-noise ratio is 112.5 dB, and total harmonic distortion and noise figures are less than 0.01% at an output power of 30 mW. The AS3412 is available now. Pricing is $1.50 each/100,000. For more details and specs, visit http://ams.com/eng/Products/Audio/Active-Noise-Cancellation/AS3412
ams USA Inc.