AS3517
austriamicrosystems
Product Brief
www.austriamicrosystems.com
Revision 1.0
1 - 3
General Description
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. It
has a variety of audio inputs and outputs to directly
connect electret microphones, 16
headset 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
power management block generates 11 different
supply voltages out of the battery supply. CPU,
NAND flash, SRAM, memory cards, harddisk, LCD
backlight, USB-HOST and USB-OTG can be
powered. The different supply voltages are
programmable via the serial control interface.
AS3517 also contains a charger. The supply
voltage can range 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.
Key Features
Multi-bit Sigma Delta Converters
DAC: 18bit with 94dB SNR (`A' weighted)
ADC: 20bit with 94dB SNR (`A' weighted)
Sampling Frequency: 8-48kHz
2 Microphone Inputs
3 gain pre-setting (28dB/34dB/40dB) and OFF
32 gain steps @1.5dB and MUTE
supply for electret microphones
microphone detection
voice activation
remote control by switch
2 Line Inputs
volume control via serial interface
32 steps @1.5dB and MUTE
stereo or 2x mono or mono differential
2 Line Outputs
volume control via serial interface
32 steps @1.5dB and MUTE
1Vp @10k
High Efficiency Headphone Amplifier
volume control via serial interface
32 steps @1.5dB and MUTE
2x60mW @16
driver capability
headphone and over-current detection
phantom ground eliminates large capacitors
Audio
Mixer
10 channel input/output mixer
mixes line inputs and microphones with DAC
left and right channels independent
Power
Management
step down for harddisk (0.65V-3.4V, 500mA)
step down for CPUcore (0.65V-3.4V, 250mA)
step down for peripheral (0.65V-3.4V, 250mA)
charge pump for USB OTG (5V, 10mA)
step up for USB HOST/OTG (5V, 500mA)
step up for backlight (15V, 40mA), dimming
LDO for digital supply (2.9V, 200mA)
LDO for analogue supply (2.9V, 200mA)
LDO for peripherals (1.2V-3.5V, 200mA)
LDO for peripherals (1.2V-3.5V, 200mA)
LDO for RTC (1.0V-2.5V, 2mA)
power supply supervision
hibernation modes
10sec and 5sec emergency shut-down
Battery
Charger
automatic trickle charge (50mA)
prog. constant current charging (50-400mA)
prog. constant voltage charging (3.9V-4.25V)
Real Time Clock
ultra low power 32kHz oscillator
32bit RTC sec counter, 96 days auto wake-up
selectable alarm (seconds or minutes)
128bit free SRAM for random settings
32kHz clock output to peripheral
Auxiliary Oscillator (only for master clock mode)
low power 12-24MHz oscillator
master clock output to peripheral (e.g.CPU)
General Purpose ADC
10bit resolution
21 inputs analogue multiplexer
Interfaces
IS digital audio interface and SPDIF
2 wire serial control interface
reset pin, watchdog via serial interface and pin
power good pin, PWM output
128bit unique ID (OTP)
30 different interrupts
Package BGA81 [9.0x9.0x1.15mm] 0.8mm pitch
Application
Portable Digital Audio Player and Recorder
PDA, Smartphone
Product Brief
AS3517
Stereo Audio Codec with advanced System Power Management
AS3517
austriamicrosystems
Product Brief
www.austriamicrosystems.com
Revision 1.0
3 - 3
Copyright
Copyright 2002-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-
Europe. Trademarks Registered . All rights reserved. The material herein may not be reproduced, adapted,
merged, translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions
appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by
description regarding the information set forth herein or regarding the freedom of the described devices from
patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time
and without notice. Therefore, prior to designing this product into a system, it is necessary to check with
austriamicrosystems AG for current information. This product is intended for use in normal commercial
applications. Applications requiring extended temperature range, unusual environmental requirements, or high
reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not
recommended without additional processing by austriamicrosystems AG for each application.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not
limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect,
special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise
or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters:
austriamicrosystems AG
Business Unit Communications
A 8141 Schloss Premsttten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
www.austriamicrosystems.com
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