AS3517

The AS3517 is a low power stereo audio codec and is designed for Portable Digital Audio Applications. It allows playback and recording in CD quality. AS3517 has a variety of audio inputs and outputs to directly connect electret microphones, 16 and 32 Ohm headphones and auxiliary signal sources via a 10-channel mixer. It only consumes 20mW in playback mode.

Further the device offers advanced power management functions. All necessary ICs and peripherals in a Digital Audio Player with flash or harddisk memory are supplied by the AS3517. The different regulated supply voltages are programmable via the serial control interface. The power management block generates 11 different supply voltages out of a single battery supply. CPU, NAND flash, SRAM, memory cards, harddisk, LCD, LCD backlight, USB-HOST and USB-OTG can be powered. AS3517 also contains a charger. The single supply voltage may vary from 3.0V to 5.5V.

The AS3517 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 in slave mode.

Further the AS3517 has an independent 32kHz real time clock (RTC) on chip which allows a complete power down of the system CPU.