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
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.
This processing can be used to compensate for real-world
limitations of speakers, amplifiers, and listening environments,
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
providing dramatic improvements in perceived audio quality.
Its signal processing 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 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
interface controls.
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
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
of the parameters can be written back to the EEPROM from the
ADAU1401 to be recalled the next time the program is run.
Multimedia speaker systems
MP3 player speaker docks
Automotive head units
Minicomponent stereos
Digital televisions
Studio monitors
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 ADAU1401 communicates through an
I2C® bus or a 4-wire SPI port.
Speaker crossovers
Musical instrument effects processors
In-seat sound systems (aircraft/motor coaches)
FUNCTIONAL BLOCK DIAGRAM
PLL
DIGITAL DIGITALANALOG ANALOG PLL LOOP
VDD GROUND VDD GROUND MODE FILTER
CRYSTAL
2
3.3V
3
3
3
3
3
CLOCK
OSCILLATOR
1.8V
REGULATOR
PLL
FILTD/CM
ADAU1401
2
2-CHANNEL
ANALOG
INPUT
DAC
DAC
STEREO
ADC
4-CHANNEL
ANALOG
OUTPUT
28-/56-BIT, 50MIPS
AUDIO PROCESSOR CORE
40ms DELAY MEMORY
FILTA/
ADC_RES
2
CONTROL
RESET/
MODE
SELECT
8-CH
DIGITAL
INPUT
8-BIT
AUX
ADC
8-CH
DIGITAL
OUTPUT
INTERFACE
AND
GPIO
SELFBOOT
INPUT/OUTPUT MATRIX
5
4
4
4
2
RESET SELF
BOOT
I C/SPI
DIGITAL IN AUX ADC DIGITAL OUT
AND
WRITEBACK
OR
OR
OR
GPIO
GPIO
GPIO
Figure 1.
Rev. 0
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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