AS3502-EQFP

AS3502-EQFP Datasheet


AS3500 AS3501 AS3502

Part Datasheet
AS3502-EQFP AS3502-EQFP AS3502-EQFP (pdf)
Related Parts Information
AS3501 EB AS3501 EB AS3501 EB
AS3502 EB AS3502 EB AS3502 EB
AS3502-EQFP-500 AS3502-EQFP-500 AS3502-EQFP-500
AS3501-EQFP AS3501-EQFP AS3501-EQFP
AS3501-EQFP-500 AS3501-EQFP-500 AS3501-EQFP-500
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AS3500 AS3501 AS3502

Data Sheet

Low Power Ambient Noise-Cancelling Speaker Driver
1 General Description

The AS3500/01/02 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.

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 AS3500/01/02 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.
2 Key Features

Microphone Input 128 gain steps and MUTE with AGC
differential, low noise microphone amplifier
single ended or differential mode
supply for electret microphone

MIC gain OTP programmable

High Efficiency Headphone Amplifier 2x34mW, THD 1.5V supply, 100dB SNR
bridged mode for e.g. loads
click and pop less start-up and mode switching

Line Input volume control via serial interface or volume pin 64 steps 0.75dB and MUTE, pop-free gain setting single ended stereo or mono differential mode

ANC processing feed-forward cancellation feed-back cancellation with filter loop transfer function definable via simple RC components simple in production SW calibration 12-30dB noise reduction headset dependent 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 simple and low cost single noise detection microphone implementation OTP ROM for automatic trimming during production

Performance Parameter 5/3.8mA 1.5V stereo/mono ANC <1uA quiescent extended PSRR for 217Hz

Interfaces 2 wire serial control mode & volume inputs calibration via Line-In or 2-wire serial interface single cell or fixed 1.0-1.8V supply with internal CP

Package AS3500, AS3501 QFN24 [4x4mm] 0.5mm pitch AS3502 QFN32 [5.x5mm] 0.5mm pitch
3 Applications

Ear pieces, Headsets, Hands-Free Kits, Mobile Phones, Voice Communicating Devices
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AS3500 AS3501 AS3502 1v2

Data Sheet

Figure AS3501 Feed Forward ANC Block Diagram

Figure AS3502 Feed-Back Block Diagram
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AS3500 AS3501 AS3502 1v2

Data Sheet

Figure AS3500 Feed-Forward Block Diagram
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AS3500 AS3501 AS3502 1v2

Data Sheet
Pin Assignment Pin Description 5 Absolute Maximum Ratings 7 6 Electrical Characteristics 8 7 Typical Operating Characteristics 9 8 Detailed Description 12 Audio Line Input Microphone Input Headphone Output Operational Amplifier SYSTEM VNEG Charge Pump OTP Memory & Internal Registers 2-Wire-Serial Control Interface 9 Register Description 25 10 Application Information 35 11 Package Drawings and Markings 39 12 Ordering Information 43
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AS3500 AS3501 AS3502 1v2

Data Sheet

Owner pkm hgt

Description official release updated application schematics typo correction updated pin and pinout description updated solder profile, power up sequences and block diagrams
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AS3500 AS3501 AS3502 1v2

Data Sheet
4 Pinout

Pin Assignment

Please observe that pin assignment may change in preliminary data sheets. Figure Pin Assignments Top View
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AS3500 AS3501 AS3502 1v2

Data Sheet

Pin Description

Please observe that pin description may change in preliminary data sheets. Table Pin Description for AS3500 AS3501 AS3502

AS3500 AS3501 AS3502 Pin Name

Type

IOP1L

ANA IN Filter OpAmp1 Input Left Channel

QLINL ANA OUT Line In GainStage Output Left Channel

QMICL ANA OUT MIC GainStage Output Right Channel

AGND

ANA IN Analog Reference

LINL

Line In Left Channel

ANA IN DIG IN

During Appl Trim Mode Write CSDA

During Appl Trim Mode Burn - VNEG

LINR

LineIn Right Channel

ANA IN DIG IO

During Appl Trim Mode Write CSCL

During Appl Trim Mode Burn - Clock

Serial Interface Data

VOL_CSDA MIXED IO ADC Input for volume regulation

Mode Pin PowerUp/Dn, Monitor
8 MODE_CSCL DIG IN Serial Interface Clock

MICL

ANA IN Microphone In Left Channel
12 Ordering Information
Table Ordering Information

Model AS3500-EQFP AS3501-EQFP AS3502-EQFP

Low Power Ambient Noise-Cancelling Speaker Driver

Low Power Ambient Noise-Cancelling Speaker Driver

Low Power Ambient Noise-Cancelling Speaker Driver

Delivery Form

Package

Tape & Reel dry pack

QFN 24 [4.0x4.0x0.85mm] 0.5mm pitch

Tape & Reel dry pack

QFN 24 [4.0x4.0x0.85mm] 0.5mm pitch

Tape & Reel dry pack

QFN 32 [5.0x5.0x0.85mm] 0.5mm pitch
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AS3500 AS3501 AS3502 1v2

Data Sheet

Copyrights

Copyright 1997-2009, 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. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.

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:
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Datasheet ID: AS3502-EQFP 519679