AS3415 EK-ST ams

Enhanced Low Noise ANC Headphone Speaker Driver www.ams.com/ANC AS3415/35 Enhanced Low Noise ANC Headphone Speaker Driver - Complementary to ams high performance portfolio of ANC solutions - Ultra-low noise architecture eradicates hiss noise - Integrated Bypass feature allows system operation without power - Complete toolchain available including EQ and ANC filter simulators enabling sound tuning, feedforward, feedback and hybrid system designGeneral Description The AS3415/35 are speaker drivers with Ambient Noise Cancelling function for headsets, The simpler feed-forward topology is used to e ectively reduce frequencies typically up headphones or ear pieces. They are intended to improve quality of e.g. music listening to 2-3 kHz. The feed-back topology with either 1 or 2 ltering stages has its strengths or a phone conversation by reducing background ambient noise. especially at very low frequencies. The fully analog implementation allows the lowest power consumption, lowest system The typical bandwidth for a feed-back system is from 20Hz up to 1 kHz. The lter loop BOM cost and most natural received voice and music enhancement otherwise di cult for both systems is determined by measurements, for each speci c headset individually, to achieve with DSP implementations. The device is designed to be easily applied to and depends very much on mechanical designs. The gain and phase compensation lter existing architectures. An internal OTP-ROM can be optionally used to store the micro- network is implemented with cheap resistors and capacitors for lowest system costs. phones gain calibration settings. The AS3415/35 are the rst devices to integrate low impedance bypass transistors rendering the device transparent in case of power loss. They both employ a special The AS3415/35 can be used in di erent con gurations for best trade-o of noise cancel- architecture to avoid THD and SNR impact in unpowered conditions. lation, required ltering functions and mechanical designs. Bene ts Features - No mechanical switch for passive playback - 30dB noise reduction achievable - Lowest background hiss noise level - Integrated bypass switches - EQ function to compensate acoustic weaknesses of headsets - Music EQ lter stage - Reduced PCB size - Ultra low noise lter OPAMPs - Up to 120mW output power (mono) - 3 x PROM for production trimming 2 - Two I C slave addresses - Full digital control - Support of Feed Forward-, Feedback- and Hybrid Topologies Applications AS3435 Block Diagram - Stereo over ear headsets - Stereo on ear headsets - Stereo ear pieces - Voice Communicating devices www.ams.com products ams.com 11/2017 by ams Subject to change without notice Headquarters Sales O ces Worldwide ams AG sales-europe ams.com Tobelbader Strasse 30, 8141 Premstaetten, Austria sales-asia ams.com Phone +43 3136 500-0 sales-americas ams.com , , ( ( ) )