AS3521B AMSCO | Alldatasheet

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Technical content

1.11, Feb. 2005 CONFIDENTIAL Page 1 of 3 1. General Description The chip is a fully integrated and highly flexible digital audio decoder for the austriamicrosystems mobile music pl atform. 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 (a udio playback) within battery or line operated equipment . An additional audio power amplifier can directly dr ive external headphones or small 4 Ω speakers with a power of up to half a watt. The power-up is click- and pop-l ess due to a smooth start-up circuitry. The overall distortion level is always below 0.02%. The microphone input amplifier contains an automati c gain control (AGC) with a dynamic range of 40dB to gener ate an amplified and compressed signal for the ADC, which provides 14 Bit resolution at 8kHz sampling-rate. Furthermore all necessary power management is inclu ded such as bandgap reference and three voltage regulat ors. 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 se nsitive analog circuits. Because of the internal supply and signal filtering only few small external capacitors are required for de-coupl ing and stabilising and lead to very low output noise. The current consumption is very low and makes the c hip ideally for battery powered devices. 2. Key Features Embedded 32-Bit RISC Controller

  • MCU and DSP functionality
  • Scaleable architecture
  • User accessible controller/DSP/memory resources
  • Boot ROM
  • Clock speed: 16 - 65 MHz Hardware Interfaces
  • 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) 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 Ω
  • 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 Σ∆− 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 3. Applications
  • Audio platform for cellular phones
  • Stand alone MP3 player and PDAs
  • CD and DVD player Advanced Audio Decoder AS3521B PRODUCT BRIEF

1.11, Feb. 2005 CONFIDENTIAL Page 2 of 3 4. Block Diagram LCD Boot Flash µP Musik Data Flash Battery > || Figure 1 Block Diagram of AS3521

1.11, Feb. 2005 CONFIDENTIAL Page 3 of 3 5. Copyright Copyright © 1997- 2005, austriamicrosystems AG, Sch loss Premstaetten, 8141 Unterpremstaetten, Austria- Europe. Trademarks Registered ®. All rights reserved. The material her ein may not be reproduced, adapted, merged, transla ted, 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 provision s appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description rega rding the information set forth herein or regarding the freedom of the descri bed devices from patent infringement. austriamicros ystems AG reserves the right to change specifications and prices at any ti me and without notice. Therefore, prior to designin g this product into a system, it is necessary to check with austriamicrosystems A G for current information. This product is intended for use in normal commercial applications. Applications requiring ext ended temperature range, unusual environmental requ irements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are spec ifically not recommended without additional processing by austriamicrosystem s AG for each application. The information furnished here by austriamicrosyste ms AG is believed to be correct and accurate. Howev er, austriamicrosystems AG shall not be liable to recip ient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of u se, 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 t echnical data herein. No obligation or liability to recipient or any third p arty shall arise or flow out of austriamicrosystems AG rendering of technical or other services. 7. Contact Information 7.1.1. Headquarters austriamicrosystems AG Business Unit Communications A 8141 Schloss Premstätten, 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