AS3400 AS3410 AS3430 Product Brief L o w P o w e r A m b i e n t N o i s e - C a n c e l l i n g Spe a k e r D r i v e r 1 General Description Line Input volume control via serial interface or volume pin The AS3400/10/30 are speaker driver with Ambient Noise Cancelling function for handsets, headphones or ear pieces. It is intended to improve quality of e.g. music listening, a phone conversation etc. by reducing background ambient noise. 64 steps @ 0.75dB and MUTE, pop-free gain setting single ended stereo or mono differential mode ANC processing 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. feed-forward cancellation An internal OTP-ROM can be optionally used to store the microphones gain calibration settings. 12-30dB noise reduction (headset dependent) The AS3400/10/30 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 low frequency background noise. The feed-back topology with either 1 or 2 filtering stages can be used to reduce noise for a larger frequency range, and to even implement transfer functions like speaker equalization, Baxandall equalization, high/low shelving filter and to set a predefined loop bandwidth. The filter loop is optimized by the user for specific handset electrical and mechanical designs by dimensioning simple R, C components. Most handset implementations will make use of a single noise detecting microphone. Two microphones could be used to allow for increased flexibility of their location in the handset mechanical design. Using the bridged mode allows to even drive high impedance headsets. feed-back cancellation with filter loop transfer function definable via simple RC components simple in production SW calibration 10-2000Hz wide frequency active noise attenuation (headset dependent) Monitor Function for assisted hearing, i.e. to monitor announcements fixed (OTP prog.) ambient sound amplification to compensate headphone passive attenuation volume controlled ambient sound amplification mixed with fixed (OTP prog.) attenuation of LineIn Incremental Functions ANC with or without music on the receiving path improved dynamic range playback OTP ROM for automatic trimming during production (4 times programbable) Performance Parameter 5/3.8mA @ 1.5V stereo/mono ANC; <1uA quiescent extended PSRR for 217Hz 2 Key Features Interfaces 2 wire serial control mode & volume inputs Microphone Input 128 gain steps @0.375dB and MUTE with AGC differential, low noise microphone amplifier single ended or differential mode calibration via Line-In or 2-wire serial interface single cell or fixed 1.0-1.8V supply with internal CP Package improved supply for electret microphone AS3400, AS3410 QFN24 [4x4mm] 0.5mm pitch MIC gain OTP programmable AS3430 QFN32 [5.x5mm] 0.5mm pitch High Efficiency Headphone Amplifier 2x34mW, 0.1% THD @ 16Ω, 1.5V supply, 100dB SNR bridged mode for e.g. 300Ω loads 3 Applications Ear pieces, Headsets, Hands-Free Kits, Mobile Phones, Voice Communicating Devices click and pop less start-up and mode switching www.austriamicrosystems.com Revision 0.2 1-3 AS3400 AS3410 AS3430 1v0 Product Brief - A p p l i c a t i o n s Figure 1. AS3410 Feed Forward ANC Block Diagram Figure 2. AS3430 Feed-Back Block Diagram www.austriamicrosystems.com Revision 0.2 2-3 AS3400 AS3410 AS3430 1v0 Product Brief - A p p l i c a t i o n s Copyrights Copyright © 1997-2010, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. 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Contact Information Headquarters austriamicrosystems AG A-8141 Schloss Premstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com Revision 0.2 3-3