Active noise cancelling ICs offer improved hearing in both Bluetooth and wired mono headsets

Active noise cancelling ICs offer improved hearing in both Bluetooth and wired mono headsets

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By eeNews Europe

The devices also improve audio performance over competing solutions with a 10 dB positive SNR – no matter the environment — improving intelligibility in wired or wireless mono communication headsets.

The Active Noise Cancelling IC AS3420 is a fully differential ANC speaker driver IC specifically designed to connect directly to common SoCs for mono Bluetooth applications. It can also be used with other types of wireless headsets. The fully analog implementation reduces ambient background noise and achieves the lowest power and the best received voice quality.

The AS3420 Bluetooth speaker driver can be used in both feed-forward and feedback configurations. The device allows for the development of simple low-order filters as well as complex multiple-order filters, thanks to the integrated low noise amplifiers. In addition, the microphone input features a fully differential low-noise amplifier, adjustable gain over 128 steps, and OTP (one time programmable) ROM for factory setting of gain.

Complementing the ANC IC AS3420, the AS3400 is a low-power ANC speaker driver designed to reduce ambient background noise in wired headsets and improve the quality of conversations or listening to music. Like the AS3420, the AS3400 can be configured for feedback or feed-forward operation.

Both receive path ICs deliver up to 30 dB of noise reduction, provide click- and pop-less operation at start-up and during mode switching. They also include highly efficient, low THD (total harmonic distortion) headphone amplifiers — 0.1% and 0.03% for the AS3420 and AS3400, respectively. Both driver ICs draw 3.8 mA at 1.5 V and less than 1 μA quiescent current in mono mode.

The AS3400 is housed in a 4 x 4 mm QFN24 package, while the ANC IC AS3420 comes in a QFN20 4 x 4 mm package. Both speaker driver ICs operate with a 1.0 to 1.8 V supply and are specified over a -20 to +85°C temperature range. A demo board is also available to speed development time.

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