AS3515

The AS3515 is a low power stereo audio codec and is designed for Portable Digital Audio Applications. It allows playback in CD quality and recording in FM-stereo quality. It has a variety of audio inputs and outputs to directly connect electret microphones, 16 Ohm headset, 4 Ohm speaker and auxiliary signal sources via a 10-channel mixer. AS3515 only consumes 22mW in playback mode.

Further the device offers advanced power management functions. All necessary ICs and peripherals in a flash based Digital Audio Player are supplied by the AS3515. The power management block generates 9 different supply voltages out of the battery supply. CPU, NAND flash, SRAM, memory cards, LCD back-light, USB RX/TX can be powered. The different supply voltages are programmable via the serial control interface. AS3515 also contains a charger and is designed for battery supplies from 1V to 5V.

The AS3515 has an on-chip, phase locked loop (PLL) controlled, clock generator. It generates 44.1kHz, 48kHz and other sample rates defined in MP3, AAC, WMA, OGG VORBIS etc. No additional external crystal or PLL is needed. Further the AS3515 has an independent 32kHz real time clock (RTC) on chip which allows a complete power down of the system CPU.