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AS3543
High End Stereo Audio Codec with System PMU
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 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 15V (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.
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, 32Ω - 7mW: 100dB DAC to Headphone @ 2.9V, 32Ω
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 @16Ω driver capability@ 1.8V supply THD -74dB @16Ω; 1.8V 2x40mW @16Ω driver capability@ 3.6V supply THD -77dB @16Ω; 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 @10kΩ, 1.8V ground noise cancellation
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Revision 1.11
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AS3543 3v2
Data Sheet - Applications
Microphone Input 3 gain pre-setting (30dB/36dB/42dB) and AGC 32 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 8 channel input/output mixer with AGC mixes line inputs, microphone and ADC with DAC left and right channels independent
Power Management
Voltage Generation step down for CPU core (0.61V-3.35V, 250mA) step down for peripheral (0.61V-3.35V, 250mA) LDO1 for AFE supply (1.7V (1.65-3.2V), 50mA) LDO2 for AFE supply (2.7V (2.3-3.5V), 200mA) LDO3 for peripherals (1.2V-3.5V, 100/200mA) LDO4 for peripherals (1.2V-3.5V, 100/200mA) VBUS comparator separate input for LDO3 power supply supervision & hibernation modes 5sec and 10sec emergency shut-down
Backlight Driver step up for backlight (15V (25V)) current control mode (1.2-37.2mA) voltage control mode 2 HV current sinks automatic dimming 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
General
Supervisor automatic battery monitoring with interrupt generation and selectable warning level automatic temperature monitoring with interrupt generation and selectable warning and shutdown levels
Real Time Clock ultra low power 32kHz oscillator 32bit RTC sec counter, 96 days auto wake-up se.