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Product Brief AS3521B
Advanced Audio Decoder
AS3521B
Hardware Interfaces
PRODUCT BRIEF
1.
General Description
* * * * * * *
USB Interface version 1.1 (support of MSC) MultiMediaCard / Secure Digital Card Interface (support of MMC mode) Smart Media Card Interface NAND Flash Interface I 2 C Slave Interface (for access to control registers) SPI (master or slave) General Purpose I/O Lines (40)
The chip is a fully integrated and highly flexible digital audio decoder for the austriamicrosystems mobile music platform. Main purpose of this platform is the integration of digital audio decoder (MP3, AAC and other formats as future option), micro controller unit, data interfaces and the analog audio channels for reproduction of digital audio. This codec-chip contains a high performance 18 bit digital to analog converter. The dynamic range exceeds 95dB for best audio quality, for multi media applications (audio playback) within battery or line operated equipment. An additional audio power amplifier can directly drive external headphones or small 4 speakers with a power of up to half a watt. The power-up is click- and pop-less due to a smooth start-up circuitry. The overall distortion level is always below 0.02%. The microphone input amplifier contains an automatic gain control (AGC) with a dynamic range of 40dB to generate an amplified and compressed signal for the ADC, which provides 14 Bit resolution at 8kHz sampling-rate. Furthermore all necessary power management is included such as bandgap reference and three voltage regulators. The two 2.9V regulators are used internally (analog and digital supply), but can also be used for external purposes as well. The third output is designed to supply the digital core, and is programmable to either 2.25V or 2.5V. The performance of the regulators is excellent (noise, line- and load-regulation) and allows the direct supply of sensitive analog circuits. Because of the internal supply and signal filtering only few small external capacitors are required for de-coupling and stabilising and lead to very low output noise. The current consumption is very low and makes the chip ideally for battery powered devices.
On chip DCDC Converter * 1.0 to 5.5V input voltage range
4 On-chip high performance voltage regulators * * * * Digital Supply, 2.9V Analog Supply, 2,9V Core Supply, 2.25V USB Transceiver Supply, 3.2V
18 Bit stereo DAC * * * Dynamic range typ. 93 dB THD typ. -85dB De-emphasis for 32 kHz, 44.1 kHz and 48 kHz
Stereo power audio amplifier * * * * Max. 2x 0.5W @ 4 Analog volume control -39dB to +3dB, 3dB steps including mute) Click- and pop-less startup and power down Auxiliary inputs for additional audio sources
Microphone input * * * * * * 14 Bit -ADC mono 24kHz FM-quality recording Automatic gain control (AGC) Audio Formats: general platform for popular digital audio formats: MP3, AAC, WMA and others. Audio sampling rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, and 48 kHz Wide battery supply range 1.0V - 5.5V 12.288MHz crystal or 13MHz clock input System Power Management Features Low power consumption
2.
* * * * *
Key Features
MCU and DSP functionality Scaleable architecture User accessible controller/DSP/memory resources Boot ROM Clock speed: 16 - 65 MHz
* * *
Embedded 32-Bit RISC Controller
3.
* * *
Applications
Audio platform for cellular phones Stand alone MP3 player and PDAs CD and DVD player
1.11, Feb. 2005
CONFIDENTIAL
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Product Brief AS3521B
4.
Block Diagram
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Figure 1
Block Diagram of AS3521
1.11, Feb. 2005
CONFIDENTIAL
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Product Brief AS3521B
5.
Copyright
Copyright (c) 1997- 2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). 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.
6.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent identification 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 life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. 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.
7.
7.1.1.
Contact Information
Headquarters
austriamicrosystems AG Business Unit Communications A 8141 Schloss Premstatten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 5692 info@austriamicrosystems.com For Sales Offices, Distributors and Representatives, please visit: www.austriamicrosystems.com
1.11, Feb. 2005
CONFIDENTIAL
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