AS3518 V10
Preliminary Product Brief, Confidential
austriamicrosystems
Preliminary Product Brief, Confidential
AS3518
Stereo Audio Codec with enhanced System Power Management
1 General Description
The AS3518 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 10-
channel mixer. It consumes less than 20mW in playback mode.
Further the device offers advanced power management
functions. All necessary ICs and peripherals in a Digital Audio
Player are supplied by the AS3518. The different regulated
supply voltages are programmable via the serial control
interface. AS3518 also contains a Li-Io battery charger. The
single supply voltage may vary from 1.0V to 5.5V.
The AS3518 has an on-chip, phase locked loop (PLL) which
generates the needed internal CODEC master clock. I2S
Frame and shift-clock has to be applied from the processor for
playback and recording. Further the AS3518 has an
independent 32kHz real time clock (RTC) on chip which allows
a complete power down of the system CPU.
•
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 up for backlight (15V (25V), 38mA),
dimming, voltage control mode
– LDO for AFE analog supply (2.9V, 200mA)
– LDO for AFE digital supply (2.9V, 200mA)
– LDO for peripherals (1.2V-3.5V, 200mA)
– LDO for peripherals e.g. USB (1.2V-3.5V, 200mA)
– 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)
– current limitation for USB mode
•
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
– voltage generation
– <1uA total power consumption
•
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
– 64bit unique ID (OTP)
– 23 different interrupts
•
Package CTBGA64 [7.0x7.0x1.1mm] 0.8mm pitch
2 Key Features
•
Multi-bit Sigma Delta Converters
– DAC: 18bit with 94dB SNR (‘A’ weighted)
– ADC: 20bit with 90dB SNR (‘A’ weighted)
– Sampling Frequency: 8-48kHz
•
1 Microphone Input
– 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
•
3 Line Inputs
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– stereo or 2x mono or mono differential
•
Audio Mixer
– 8 channel input/output mixer with AGC
– mixes line inputs and microphones with DAC
– left and right channels independent
•
Line Output
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– 1Vp @10kΩ
– Stereo 2*5mW @16Ω
– Mono differential 10mW @32Ω (earpiece)
3 Application
Portable Digital Audio Player and Recorder
PDA, Smartphone
© 2003-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
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