AS3543 datasheet(2/92 Pages) AMSCO

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Data Sheet

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. 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 15V (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 to 5.5V.

2 Key Features

Audio

Audio power consumption:

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

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

Sigma Delta Converters

DAC

- 98dB SNR ('A' weighted) @ 1.7V

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

ADC

- 85dB SNR ('A' weighted) @ 1.7V

Sampling Frequency

- DAC: 8-96kHz

- 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 @16 ; 1.8V

2x40mW @16

driver capability@ 3.6V supply

THD -77dB @16 ; 3.6V

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 @10k , 1.8V

ground noise cancellation

AS3543 数据表(PDF) 2 Page - ams AG

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