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AS3518 Datasheet, PDF (1/3 Pages) ams AG – Stereo Audio Codec with enhanced System Power Management | |||
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AS3518 V10
Preliminary Product Brief, Confidential
austriamicrosystems
AS3518
Preliminary Product Brief, Confidential
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.
2 Key Features
⢠Multi-bit Sigma Delta Converters
â DAC: 18bit with 94dB SNR (âAâ weighted)
â ADC: 20bit with 90dB SNR (âAâ weighted)
â Sampling Frequency: 8-48kHz
⢠1 Microphone Input
â 3 gain pre-setting (28dB/34dB/40dB) and AGC
â 32 gain steps @1.5dB and MUTE
â supply for electret microphone
â microphone detection
â remote control by switch
⢠3 Line Inputs
â volume control via serial interface
â 32 steps @1.5dB and MUTE
â stereo or 2x mono or mono differential
⢠Audio Mixer
â 8 channel input/output mixer with AGC
â mixes line inputs and microphones with DAC
â left and right channels independent
⢠Line Output
â volume control via serial interface
â 32 steps @1.5dB and MUTE
â 1Vp @10kΩ
â Stereo 2*5mW @16Ω
â Mono differential 10mW @32Ω (earpiece)
⢠High Efficiency Headphone Amplifier
â volume control via serial interface
â 32 steps @1.5dB and MUTE
â 2x60mW @16Ω driver capability
â headphone and over-current detection
â phantom ground eliminates large capacitors
⢠Power Management
â step down for CPU core (0.65V-3.4V, 250mA)
â step down for peripheral (0.65V-3.4V, 250mA)
âstep up for backlight (15V (25V), 38mA),
dimming, voltage control mode
â LDO for AFE analog supply (2.9V, 200mA)
â LDO for AFE digital supply (2.9V, 200mA)
â LDO for peripherals (1.2V-3.5V, 200mA)
â LDO for peripherals e.g. USB (1.2V-3.5V, 200mA)
â power supply supervision
â hibernation modes
â 5sec and 10sec emergency shut-down
⢠Battery Charger
â automatic trickle charge (50mA)
â prog. constant current charging (50-460mA)
â prog. constant voltage charging (3.9V-4.25V)
â current limitation for USB mode
⢠Real Time Clock
â ultra low power 32kHz oscillator
â 32bit RTC sec counter, 96 days auto wake-up
â selectable alarm (seconds or minutes)
â 128bit free SRAM for random settings
â 32kHz clock output to peripheral
â voltage generation
â <1uA total power consumption
⢠General Purpose ADC
â 10bit resolution
â 21 inputs analog multiplexer
⢠Interfaces
â I²S digital audio interface and SPDIF
â 2 wire serial control interface
â reset pin, watchdog, power good pin
â PWM output
â 64bit unique ID (OTP)
â 23 different interrupts
⢠Package CTBGA64 [7.0x7.0x1.1mm] 0.8mm pitch
3 Application
Portable Digital Audio Player and Recorder
PDA, Smartphone
© 2003-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
Revision 0.5
1-3
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