Low-power, high performance AS3435 and miniature AS3412 noise-cancelling ICs from ams enable headphone-maker FIIL to achieve what is described as outstanding ANC performance in its next-gen on- and in-ear headphones. The ams hybrid Active Noise Cancellation (ANC) audio IC, the AS3435, is used in the high performance Canviis Pro wireless on-ear headphones. In addition, ams’ AS3412 finds employment in the Driifter Pro, one of the first neck-band-based Bluetooth in-ear ANC headphones of its kind. The AS3412 – which comes in a tiny WL-CSP – is ideally suited for this audio application because of the headphones’ size constraints.
The ams portfolio of ANC ICs offers a combination of high audio performance and low power consumption. Advanced noise cancellation features include:
- Smart noise adjustment – user-selectable choice of three operating modes. The chip normally operates in noise-cancelling mode but also offers a monitor mode, which blocks low-frequency noise but allows the user to hear mid-to-high frequencies, and an open mode, which allows the user to hear all ambient noise.
- Wind mode – cancels out noise caused by wind.
The AS3435 was chosen for the Canviis Pro on-ear headphones in order to enable an
active noise cancellation and greater than 30 dB of noise attenuation and a THD of less than 0.5% at a 100-dB SPL.
For the Driifter Pro in-ear headphones, the requirement was to fit a chip with good noise-cancellation capability in a tiny end-product housing, with low power consumption. FIIL’s choice, the AS3412, measures 2.2 mm x 2.2 mm x 0.4 mm in a WL-CSP. Operating from a supply voltage of 1.6V to 1.8V, the AS3412 just 8 mW.
More information about the ams line of noise-cancelling ICs is available as well as FIIL’s range of headsets.