Features: • MCU and DSP functionality
• Scaleable architecture
• User accessible controller/DSP/memory resources
• Boot ROM
• Clock speed: 16 - 50 MHzApplication• Audio platform for cellular phones
• Stand alone MP3 player
• CD and DVD player
• PDAsDescriptionThe chip AS3520 is a fully integrated and highly flexible digital audio decoder for the austriamicrosystems mobile music platform.Main purpose of AS3520 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 AS3520 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 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 of AS3520 is always below 0.02%.
The microphone input amplifier of AS3520 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 of AS3520 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 of AS3520 is very low and makes the chip ideally for battery powered devices.
AS3520 Data Sheet
