AS3521B

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 Ω 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 include...