AS3517 Stereo Audio Codec with Advanced System Power Management0 pages

AS3517 V17
Data Sheet, Confidential

Data Sheet, Confidential

AS3517
Stereo Audio Codec with enhanced System Power Management

1 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/32Ω headsets and auxiliary signal sources via a 10channel 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 USBOTG 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.

2 Key Features
• Multi-bit Sigma Delta Converters
– DAC: 94dB SNR (‘A’ weighted) @ 2.9V
– ADC: 90dB SNR (‘A’ weighted) @ 2.9V
– Sampling Frequency: 8-48kHz
• 2 Microphone Inputs
– 3 gain pre-setting (28dB/34dB/40dB) and AGC
– 32 gain steps @1.5dB and MUTE
– supply for electret microphone
– microphone detection
– 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
• Audio Mixer
– 10 channel input/output mixer with AGC
– mixes line inputs and microphones with DAC
– left and right channels independent
• 2 Line Outputs
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– 1Vp @10kΩ
– Stereo 2*5mW to 16ohm
– Differential 10mW to 32ohm (earpiece)

• High Efficiency Headphone Amplifier
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– 2x60mW @16Ω driver capability
– headphone and over-current detection
– phantom ground eliminates large capacitors
• Power Management
– step down for CPU core (0.65V-3.4V, 250mA)
– step down for peripheral (0.65V-3.4V, 250mA)
– step down for harddisk (0.65V-3.4V, 500mA)
– step up for backlight (15V (25V), 38mA),
– LDO for digital supply (2.9V, 200mA)
– LDO for analog 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
– 5sec and 10sec emergency shut-down
• Battery Charger
– automatic trickle charge (50mA)
– prog. constant current charging (50-460mA)
– 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 input/output (e.g. from/to CPU)
• General Purpose ADC
– 10bit resolution
– 21 inputs analog multiplexer
• Interfaces
– I²S digital audio interface and SPDIF
– 2 wire serial control interface
– reset pin, watchdog, power good pin
– PWM output
– 128bit unique ID (OTP)
– 30 different interrupts
• Package CTBGA81 [9.0x9.0x1.15mm] 0.8mm pitch

3 Application
Portable Digital Audio Player and Recorder
PDA, Smartphone

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www.austriamicrosystems.com
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