Product Brief
Product Brief
Stereo Audio Codec with advanced System Power Management
– 32 steps @1.5dB and MUTE
– 2x60mW @16Ω driver capability
– headphone and over-current detection
– phantom ground eliminates large capacitors
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, 16Ω 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.
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
– I²S 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
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 @10kΩ
High Efficiency Headphone Amplifier
– volume control via serial interface
Portable Digital Audio Player and Recorder
PDA, Smartphone
Revision 1.0
Product Brief
Block Diagram
Revision 1.0
Product Brief
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Contact Information
austriamicrosystems AG
Business Unit Communications
A 8141 Schloss Premstätten, Austria
T. +43 (0) 3136 500 0
F. +43 (0) 3136 5692
[email protected]
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Revision 1.0
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