as3543 austriamicrosystems, as3543 Datasheet

as3543

Manufacturer Part Number

as3543

Description

High End Stereo Audio Codec With System Power Management

Manufacturer

austriamicrosystems

Datasheet

1.AS3543.pdf (4 pages)

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A S 3 5 4 3

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

The AS3543 is an ultra low power stereo audio codec

and is designed for Portable Digital Audio Applications.

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 micro-

phone) 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 out-

put 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, fade-

out 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 tim-

ing for the voltage stepping. The different regulated sup-

ply 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 volt-

age and current control mode. An internal voltage pro-

tection 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 con-

stant current, constant voltage and trickle charging. The

maximum charging current is 460mA. An integrated bat-

tery 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 dis-

charged 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.

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

Key Features

Audio

Audio power consumption:

Sigma Delta Converters

High Efficiency Headphone Amplifier

Line Output

- 98dB SNR ('A' weighted) @ 1.8V

- 102dB SNR ('A' weighted) @ 2.9V

- 83dB SNR ('A' weighted) @ 1.8V

- DAC: 8-48kHz

- ADC: 8-24kHz

- 5mW: 96dB DAC to Headphone @ 1.8V, 32Ω

- 7mW: 100dB DAC to Headphone @ 2.9V, 32Ω

DAC

ADC

Sampling Frequency

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

volume control via serial interface

32 steps @1.5dB and MUTE

0.6Vp @10kΩ

ground noise cancellation

P r e l i m i n a r y P r o d u c t B r i e f

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Related parts for as3543

as3543 Summary of contents

Page 1

... General Description The AS3543 is an ultra low power stereo audio codec and is designed for Portable Digital Audio Applications. It allows high-end quality playback with up to 100dBA SNR and recording in FM quality ...

Page 2

... AS3543 Preliminary Product Brief - Microphone Input 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 2 Line Inputs volume control via serial interface 32 steps @1.5dB and MUTE stereo or 2x mono Audio Mixer ...

Page 3

... AS3543 Preliminary Product Brief - Figure 1. Block Diagram www.austriamicrosystems.com Revision 0. ...

Page 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, trans- lated, 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. ...

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