Details, datasheet, quote on part number: AS3435-EQFM
PartAS3435-EQFM
Category
TitleIC HEADPHONE NOISE-CANCEL 36QFN
Description
Companyams
DatasheetDownload AS3435-EQFM datasheet
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AS3435-EQFM photo

 

Features, Applications
Integrated Active Noise Cancelling Solution with Bypass Feature

The AS3415/35 are speaker drivers with Ambient Noise Cancelling function for headsets, headphones or ear pieces. They are intended to improve quality of e.g. music listening, a phone conversation etc. by reducing background ambient noise. The fully analog implementation allows the lowest power consumption, lowest system BOM cost and most natural received voice enhancement otherwise difficult to achieve with DSP implementations. The device is designed to be easily applied to existing architectures. An internal OTP-ROM can be optionally used to store the microphones gain calibration settings. The AS3415/35 can be used in different configurations for best trade-off of noise cancellation, required filtering functions and mechanical designs. The simpler feed-forward topology is used to effectively reduce frequencies typically to 2-3 kHz. The feed-back topology with either or 2 filtering stages has its strengths especially at very low frequencies. The typical bandwidth for a feed-back system is from to 1 kHz which is lower than the feed-forward systems. The filter loop for both systems is determined by measurements, for each specific headset individually, and depends very much on mechanical designs. The gain and phase compensation filter network is implemented with cheap resistors and capacitors for lowest system costs. Ordering Information and Content Guide appear at end of datasheet.

The benefits and features of AS3415/35, Integrated Active Noise Cancelling Solution with Bypass Feature are listed below: Figure 1: Added Value of Using AS3415/35

All ANC Topologies No mechanical audio bypass switch Music EQ functionality
Features

Feed Forward, Feed Back and Hybrid Integrated depletion mode transistors Ultra flexible low power EQ circuit

Longest play time Highest audio quality Smallest package Low battery indication Different control interface options Highly innovative production trimming interface Active hearing mode with or without ANC and optional voice EQ

10mW @1.5V stereo ANC; <1A quiescent 2x24mW, 0.1% THD+N 32, 1.5V supply Two different packages available: [5x5mm] 0.5mm pitch [5x5mm] 0.4mm pitch LED driver with selectable driving strength Push Button-, Slide switch- or I˛C control interface OTP production trimming via audio interface Monitor mode function

Applications

The devices are ideal for: Ear pieces Headsets Hands-Free Kits Mobile Phones Voice Communicating Devices

The functional blocks of AS3415/35 for reference are shown below: Figure 2: AS3415 Block Diagram

 

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