21ic News Austriamicrosystems has announced the addition of two new products, enriching its Active Noise Cancelling chip product line to improve the sound quality in noisy environments. Both the AS3400 and AS3420 have the lowest power supply requirements, and the battery life is extended by at least 20% compared to other ANC solutions. The product is highly competitive, with a 10 dB forward signal-to-noise ratio that improves audio performance regardless of the environment and increases the clarity of wired or wireless mono communication headsets. This article refers to the address: http:// The Active Noise Cancelling Chip AS3420 is a fully differential ANC speaker driver chip specifically designed for mono Bluetooth applications that can be directly connected to a common SoC. It can also be applied to other types of wireless headphones. Fully analog to reduce ambient background noise and achieve the lowest power consumption and best voice quality. The AS3420 Bluetooth speaker driver chip can be used for feedforward and feedback configurations. Thanks to the integrated low noise amplifier, the device enables the development of simple low-order filters as well as complex multi-order filters. In addition, the microphone input features a fully differential low noise amplifier that achieves 128 levels of adjustable gain, and OTP (One Time Programmable) ROM enables factory gain setting. In addition to the ANC chip AS3420, the AS3400 is another low-power ANC speaker driver chip specifically designed to reduce the ambient background noise of wired headphones and improve the sound quality of calls and music. Like the AS3420, the AS3400 can also be configured for feedback or feedforward operation. The receiving paths of the two products enable up to 30 decibels of noise reduction, avoiding click noise and pop noise during start-up and mode switching. They also include high efficiency, low THD (Total Harmonic Distortion) headphone amplifiers - 0.1% for the AS3420 and 0.03% for the AS3400. The two driver chips require only 3.8 mA at 1.5 V and the quiescent current required in mono mode is less than 1 μA. Oliver Jones, Austrian marketing manager for microelectronics audio products, said: “People have said many times, 'Please say it again, I can't hear what you are saying.' No matter where people are, they want to keep in touch. Active noise reduction. Significantly improved sound quality, even in mono products, guarantees superior sound quality. Application solutions that implement digital ANC functionality through software applications require more energy and cannot achieve the same performance. The practice is simply to increase the volume in a noisy environment and to distort the caller's voice under certain conditions." The Austrian Microelectronics AS3400 is packaged in 4 x 4 mm QFN24, while the ANC chip AS3420 is packaged in QFN20 4 x 4 mm. The two speaker driver ICs operate from a 1.0 to 1.8 V supply and operate from -20 to +85 °C. Supply
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The ANC chips AS3400 and AS3420 are available from now on, starting at 1,000 units. Product demonstration boards are also available to reduce development time. 