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| Product Brief AS3520 Advanced Audio Decoder AS3520 1. General Description Hardware Interfaces * * * * * * * * * * * * * * * * * * * * * * * * * * * PRODUCT BRIEF USB Interface version 1.1 (support of MSC) MultiMediaCard 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 from 1.5V to 2.5V in 5 steps. The performance of the regulators is excellent (noise, lineand 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 Digital Supply, 2.9V Analog Supply, 2,9V Core Supply, 2.5V USB Transceiver Supply, 3.2V Dynamic range >95 dB THD < -85dB De-emphasis for 32 kHz, 44.1 kHz and 48 kHz 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 14 Bit -ADC mono, 8kHz voice quality recording Automatic gain control (AGC) Audio Formats: general platform for popular digital audio formats: MP3, AAC, 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 System Power Management Features Low power consumption 4 On-chip high performance voltage regulators 18 Bit stereo DAC Stereo power audio amplifier Microphone input 2. * * * * * Key Features MCU and DSP functionality Scaleable architecture User accessible controller/DSP/memory resources Boot ROM Clock speed: 16 - 50 MHz Embedded 32-Bit RISC Controller 3. * * * * Applications Audio platform for cellular phones Stand alone MP3 player CD and DVD player PDAs 1.5, June 2004 Page 1 of 2 Product Brief AS3520 4. Block Diagram LCD > || << >> P ry tte Ba Bo ot Mu sik Fla Dat sh a Fla sh Figure 1 Block Diagram of AS3520 1.5, June 2004 Page 2 of 2 |
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