ADAU1401A Datasheet, PDF (1/52 Pages) Analog Devices – SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs

SigmaDSP 28-/56-Bit Audio Processor
with Two ADCs and Four DACs
ADAU1401A
FEATURES
GENERAL DESCRIPTION
28-/56-bit, 50 MIPS digital audio processor
2 ADCs: SNR of 100 dB, THD + N of −83 dB
4 DACs: SNR of 104 dB, THD + N of −90 dB
Complete standalone operation
Self-boot from serial EEPROM
Auxiliary ADC with 4-input mux for analog control
GPIOs for digital controls and outputs
Fully programmable with SigmaStudio graphical tool
28-bit × 28-bit multiplier with 56-bit accumulator for full
double-precision processing
Clock oscillator for generating master clock from crystal
PLL for generating master clock from 64 × fS, 256 × fS,
384 × fS, or 512 × fS clocks
Flexible serial data input/output ports with I²S-compatible,
left-justified, right-justified, and TDM modes
Sampling rates of up to 192 kHz supported
On-chip voltage regulator for compatibility with 3.3 V systems
48-lead, plastic LQFP
APPLICATIONS
Multimedia speaker systems
MP3 player speaker docks
Automotive head units
Minicomponent stereos
Digital televisions
Studio monitors
Speaker crossovers
Musical instrument effects processors
In-seat sound systems (aircraft/motor coaches)
The ADAU1401A is a complete, single-chip audio system with
28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like
control interfaces. Signal processing includes equalization, cross-
over, bass enhancement, multiband dynamics processing, delay
compensation, speaker compensation, and stereo image widening.
This processing can be used to compensate for real-world limita-
tions of speakers, amplifiers, and listening environments, providing
dramatic improvements in perceived audio quality.
The signal processing of the ADAU1401A is comparable to that
found in high end studio equipment. Most processing is done in
full 56-bit, double-precision mode, resulting in very good low
level signal performance. The ADAU1401A is a fully program-
mable DSP. The easy to use SigmaStudio™ software allows the
user to graphically configure a custom signal processing flow
using blocks such as biquad filters, dynamics processors, level
controls, and GPIO interface controls.
The ADAU1401A programs can be loaded on power-up either
from a serial EEPROM through its own self-boot mechanism or
from an external microcontroller. On power-down, the current
state of the parameters can be written back to the EEPROM from
the ADAU1401A to be recalled the next time the program is run.
Two Σ-Δ ADCs and four Σ-Δ DACs provide a 98.5 dB analog
input to analog output dynamic. Each ADC has a THD + N of
−83 dB, and each DAC has a THD + N of −90 dB. Digital input
and output ports allow a glueless connection to additional ADCs
and DACs. The ADAU1401A communicates through an I²C® bus
or a 4-wire SPI port.
FUNCTIONAL BLOCK DIAGRAM
DIGITAL VDD DIGITAL GROUND
3.3V
3
3
ANALOG VDD ANALOG PLL MODE PLL LOOP
GROUND
FILTER
3
2
3
CRYSTAL
2
2-CHANNEL
ANALOG
INPUT
1.8V
REGULATOR
FILTA/
ADC_RES 2
STEREO
ADC
ADAU1401A
PLL
CLOCK OSCILLATOR
28-/56-BIT, 50MIPS
AUDIO PROCESSOR CORE, 40ms DELAY MEMORY
DAC
DAC
FILTD/CM
2
4-CHANNEL
ANALOG
OUTPUT
RESET/
MODE
SELECT
CONTROL INTERFACE
AND SELF-BOOT
8-CHANNEL 8-BIT AUX
DIGITAL INPUT
ADC
GPIO
8-CHANNEL
DIGITAL OUTPUT
INPUT/OUTPUT MATRIX
5
3
3
3
RESET SELF-BOOT
I²C/SPI AND WRITEBACK DIGITAL IN OR GPIO
Figure 1.
AUX ADC OR GPIO
DIGITAL OUT OR GPIO
Rev. 0
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