ADAU1401 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
ADAU1401
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
The ADAU1401 is a complete single-chip audio system with a
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.
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
This processing can be used to compensate for real-world
limitations of speakers, amplifiers, and listening environments,
providing dramatic improvements in perceived audio quality.
Its signal processing is comparable to that found in high
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
end studio equipment. Most processing is done in full 56-bit,
double-precision mode, resulting in very good low level signal
performance. The ADAU1401 is a fully programmable 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
APPLICATIONS
Multimedia speaker systems
MP3 player speaker docks
Automotive head units
interface controls.
ADAU1401 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
Minicomponent stereos
Digital televisions
Studio monitors
Speaker crossovers
of the parameters can be written back to the EEPROM from the
ADAU1401 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
Musical instrument effects processors
In-seat sound systems (aircraft/motor coaches)
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 ADAU1401 communicates through an
I²C® bus or a 4-wire SPI port.
FUNCTIONAL BLOCK DIAGRAM
PLL
DIGITAL DIGITALANALOG ANALOG PLL LOOP
3.3V ^{VDD GROUND VDD GROUND MODE FILTER}
3
3
3
3
3
CRYSTAL
2
1.8V
REGULATOR
2-CHANNEL
ANALOG
INPUT
FILTA/
ADC_RES 2
STEREO
ADC
PLL
ADAU1401
28-/56-BIT, 50MIPS
AUDIO PROCESSOR CORE
40ms DELAY MEMORY
CLOCK
OSCILLATOR
DAC
DAC
2 ^FILTD/CM
4-CHANNEL
ANALOG
OUTPUT
RESET/
MODE
SELECT
CONTROL
INTERFACE
AND
SELFBOOT
8-CH
DIGITAL
INPUT
8-BIT
AUX
ADC
GPIO
8-CH
DIGITAL
OUTPUT
INPUT/OUTPUT MATRIX
5
RESET SELF
I²C/SPI
BOOT
AND
WRITEBACK
4
4
4
DIGITAL IN AUX ADC DIGITAL OUT
OR
OR
OR
GPIO
GPIO
GPIO
Figure 1.
Rev. 0
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