AS3410/30 Active Noise Cancellation ICs

The ams OSRAM AS3410/30 combine a high quality (0.1% THD, >100dB SNR), true ground, audio headphone amplifier with all the necessary circuitry to enable active noise cancellation, all at very-low power consumption, specifically targeting accessories. The AS3410 is ideally suited for feed-forward topology, whereas AS3430 is better suited for feedback topology. The speakers can be configured in single-ended mode (2 x 34 mW at 1.5 V, 16 Ω) or Bridge Tied Load (1 x 109 mW at 1.5 V, 16 Ω) and the line-in gain is adjustable to allow for locally-controlled volume setting. The device contains an OTP-ROM to store calibration settings for the noise cancelling microphones, removing the need for the manually-trimmed pots typically used. The OTP can also be used to store device configuration settings, allowing flexibility and differentiation for a broad end-product portfolio.