AS3543
Preliminary Product Brief
H i g h E n d St e r e o A u d i o C o d e c w i t h S y s t e m P M U
General Description
Key Features
The AS3543 is an ultra low power stereo audio codec
and is designed for Portable Digital Audio Applications.
Audio
It allows high-end quality playback with up to 100dBA
SNR and recording in FM quality. With one microphone
(including pre-amplifier and supply for an electret microphone) and two line inputs, it allows connecting a variety
of audio inputs. The different audio signals can be mixed
via a 6-channel mixer and fed to either a headphone output for 16 /32 headsets or a line output. Both outputs
have a ground noise cancellation to use it e.g. in car
docking stations. The audio outputs have also an auto
fading implemented which performs the fade-in, fadeout as well as the transition between specific volume
levels automatically with an selectable timing.
Further the device offers advanced power management
functions. All necessary ICs and peripherals in a Digital
Audio Player are supplied by the AS3543. It features 2
DCDC converters for core and memory/periphery supply
as well as 4 LDOs. Both DCDC converter feature DVM
(dynamic voltage management) with an selectable timing for the voltage stepping. The different regulated supply voltages are programmable via the serial control
interface.
The step-up converter for the backlight can operate up
to 25V (with an external transistor even higher) in voltage and current control mode. An internal voltage protection is limiting the output voltage in the case of
external component failures. 2 high voltage current sinks
can be used to operate two , if needed also unbalanced,
LED strings. An automatic dimming function allows a
logarithmic on/off of the backlight with selectable timing.
AS3543 also contains a Li-Ion battery charger with constant current, constant voltage and trickle charging. The
maximum charging current is 460mA. An integrated battery switch is separating the battery during charging or
whenever an external power supply is present. With this
switch it is also possible to operate with no or deeply discharged batteries.
The AS3543 has an on-chip, phase locked loop (PLL)
which generates the needed internal CODEC master
clock. I2S Frame and shift-clock have to be applied from
the processor for playback and recording.
Audio power consumption:
- 5mW: 96dB DAC to Headphone @ 1.8V, 32Ω
- 7mW: 100dB DAC to Headphone @ 2.9V, 32Ω
Sigma Delta Converters
DAC
- 98dB SNR ('A' weighted) @ 1.8V
- 102dB SNR ('A' weighted) @ 2.9V
ADC
- 83dB SNR ('A' weighted) @ 1.8V
Sampling Frequency
- DAC: 8-48kHz
- ADC: 8-24kHz
High Efficiency Headphone Amplifier
volume control via serial interface
32 steps @1.5dB and MUTE
2x12mW @16 driver capability@ 1.8V supply
THD -74dB @16Ω; 1.8V
2x40mW @16 driver capability@ 2.9V supply
THD -77dB @16Ω; 2.9V
headphone and over-current detection
phantom ground eliminates large capacitors
ground noise cancellation
Line Output
volume control via serial interface
32 steps @1.5dB and MUTE
0.6Vp @10kΩ
ground noise cancellation
Further the AS3543 has an independent 32kHz real time
clock (RTC) on chip which allows a complete power
down of the system CPU while only consuming less than
1µA. An internal switch automatically switches between
the RTC backup-battery and main battery supply.
The single supply voltage may vary from 2.7V (2.4V) to
5.5V.
www.austriamicrosystems.com
Revision 0.12
1-4
AS3543
Preliminary Product Brief -
Microphone Input
General
3 gain pre-setting (28dB/34dB/40dB) and AGC
2 gain steps @1.5dB and MUTE
supply for electret microphone
microphone detection
remote control by switch
Supervisor
automatic battery monitoring with interrupt generation and selectable warning level
automatic temperature monitoring with interrupt
generation and selectable warning and shutdown
levels
2 Line Inputs
volume control via serial interface
32 steps @1.5dB and MUTE
stereo or 2x mono
Audio Mixer
6 channel input/output mixer with AGC
mixes line inputs abd microphone with DAC
left and right channels independent
Power Management
Voltage Generation
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
trim able oscillator
<1uA total power consumption
Auxiliary Oscillator (system clock generation)
step down for CPU core (0.61V-3.35V, 250mA)
low power 12-24MHz oscillator
step down for peripheral (0.61V-3.35V, 250mA)
clock output
LDO1 for AFE supply (1.7V (1.65-3.2V), 50mA)
General Purpose ADC
LDO2 for AFE supply (2.7V (2.3-3.5V), 200mA)
10bit resolution
LDO3 for peripherals (1.2V-3.5V, 100/200mA)
19 inputs analog multiplexer
LDO4 for peripherals (1.2V-3.5V, 100/200mA)
VBUS comparator
Interfaces
2 wire serial control interface
separate input for LDO3
reset pin with selectable delay, power good pin
power supply supervision & hibernation modes
64bit unique ID (OTP)
5sec and 10sec emergency shut-down
22 different interrupts
Backlight Driver
Package CTBGA68 [6.0x6.0x1.1mm] 0.5mm pitch
step up for backlight (25V)
current control mode (1.2-36mA)
voltage control mode
2 current sinks
automatic dimming
Applications
Portable Digital Audio/Video Player and Recorder
PDA, Smartphone
over-voltage protection
Battery Charger
automatic trickle charge (55mA)
prog. constant current charging (55-460mA)
prog. constant voltage charging (3.9V-4.25V)
current limitation for USB mode
integrated battery switch
www.austriamicrosystems.com
Revision 0.12
2-4
AS3543
Preliminary Product Brief -
Figure 1. Block Diagram
www.austriamicrosystems.com
Revision 0.12
3-4
AS3543
Preliminary Product Brief -
Copyrights
Copyright © 1997-2007, 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 or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification 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 lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
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
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com
Revision 0.12
4-4