Product Brief AS3520 Advanced Audio Decoder AS3520 1. General Description PRODUCT BRIEF Hardware Interfaces 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. • 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) On chip DCDC Converter • 1.0 to 5.5V input voltage range 4 On-chip high performance voltage regulators • Digital Supply, 2.9V An additional audio power amplifier can directly drive • Analog Supply, 2,9V external headphones or small 4Ω 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%. • • Core Supply, 2.5V USB Transceiver Supply, 3.2V 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. 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 - 50 MHz 1.5, June 2004 18 Bit stereo DAC • • Dynamic range >95 dB THD < -85dB • De-emphasis for 32 kHz, 44.1 kHz and 48 kHz Stereo power audio amplifier • Max. 2x 0.5W @ 4Ω • • 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, • 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 3. Applications • Audio platform for cellular phones • Stand alone MP3 player • • CD and DVD player PDAs Page 1 of 2 Product Brief AS3520 Block Diagram ry tte Ba 4. Mu sik Fla Dat sh a Fla sh << > || >> LCD µP Bo ot Figure 1 1.5, June 2004 Block Diagram of AS3520 Page 2 of 2