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AS3514 V12
Data Sheet, Confidential
austriamicrosystems
Data Sheet, Confidential
AS3514
Stereo Audio Codec with System Power Management
1 General Description
The AS3514 is a low power stereo audio codec and is
designed for Portable Digital Audio Applications. It allows
playback in CD quality and recording in FM-stereo quality. It
has a variety of audio inputs and outputs to directly connect
electret microphones, 16Ω headset, 4Ω speaker and auxiliary
signal sources via a 10-channel mixer. It only consumes 22mW
in playback mode.
Further the device offers advanced power management
functions. All necessary ICs and peripherals in a flash based
Digital Audio Player are supplied by the AS3514. The power
management block generates 9 different supply voltages out of
the battery supply. CPU, NAND flash, SRAM, memory cards,
LCD back-light, USB RX/TX can be powered. The different
supply voltages are programmable via the serial control
interface. It also contains a charger and is designed for battery
supplies from 1V to 5V.
The AS3514 has an on-chip, phase locked loop (PLL)
controlled, clock generator. It generates 44.1kHz, 48kHz and
other sample rates defined in MP3, AAC, WMA, OGG VORBIS
etc. No additional external crystal or PLL is needed. Further the
AS3514 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
– DAC: 18bit with 94dB SNR (‘A’ weighted) , 48kHz
– ADC: 14bit with 82dB SNR (‘A’ weighted), 16kHz
2 Microphone Inputs
– 3 gain pre-setting (28dB/34dB/40dB) with 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 or mono differential
Line Outputs
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– 1Vp @10kΩ
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Audio Mixer
– 10 channel input/output mixer with AGC
– mixes line inputs and microphones with DAC
– left and right channels independent
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Battery Charger
– automatic trickle charge (50mA)
– prog. constant current charging (100-400mA)
– prog. constant voltage charging (3.9V-4.25V)
Real Time Clock
– ultra low power 32kHz oscillator
– 32bit RTC sec counter
– selectable alarm (seconds or minutes)
General Purpose ADC
– 10bit resolution
– 16 inputs analogue multiplexer
Interfaces
– I²S digital audio interface
– 2 wire serial control interface
– watchdog via serial interface
– power good pin
– 128bit unique ID (OTP)
– 17 different interrupts
Package CTBGA64 [7.0x7.0x1.1mm] 0.8mm pitch
Power Management
– step up for system supply (3.0V – 3.6V)
– step down for CPU core (0.85V – 1.8V, 200mA)
– step up for backlight (15V, 38.5mA)
– LDO for digital supply (2.9V, 200mA)
– LDO for analogue supply (2.9V, 200mA)
– LDO for peripherals (1.7V-3.3V, 200mA)
– LDO for peripherals (3.1V-3.3V, 200mA)
– LDO for RTC (1.0V-2.5V, 2mA)
– LDO for USB 1.1 transceiver (3.26V, 10mA)
– battery supervision
– 10sec emergency shut-down
3 Application
Portable Digital Audio Player and Recorder
PDA, Smartphone
Revision 0.92
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High Power Speaker Amplifier
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– 2x500mW @8Ω driver capability
– over-current detection
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High Efficiency Headphone Amplifier
– volume control via serial interface
– 32 steps @1.5dB and MUTE
– 2x40mW @16Ω driver capability
– headphone and over-current detection
– phantom ground eliminates large capacitors
AS3514 V12
Data Sheet, Confidential
austriamicrosystems
4 Block Diagram
Figure 1
AS3514 Block Diagram
VSSC1
CVDD
LX_C1
VDDC1
CPVDD
RVDD
XIN
XOUT
CSDA
CSCL
IRQ
ZAPOE
ZAPEN
PROG
VREF
AGND
P_CVDD
P_PVDD
DVDD
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DVSS
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UVDD
ISINK
VSS15
SW15
to I2C
MCLK
LRCK
Revision 0.92
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VTRM
CHG_OUT
CHG_IN
BATTEMP
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AS3514 V12
Data Sheet, Confidential
austriamicrosystems
Contents
1
2
3
4
5
General Description ......................................................................................................................................... 1
Line Output ............................................................................................................................................... 8
Line Inputs (2x) ....................................................................................................................................... 18
Digital Audio Interface............................................................................................................................. 20
SYSTEM ............................................................................................................................................. 35
6.12.1
General ........................................................................................................................................ 35
6.12.2
Power Up ..................................................................................................................................... 35
6.12.3
Power Down................................................................................................................................. 35
9 Ordering Information ...................................................................................................................................... 64
Contact Information .................................................................................................................................... 65
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