ADAU1701 Datasheet, PDF (1/43 Pages) Analog Devices – SigmaDSP 28/56-Bit Audio Processor with 2ADC/4DAC

Preliminary Technical Data
FEATURES
28/56-bit, 50 MHz digital audio processor
Stereo ADC: 100 dB SNR and -80 dB THD+N
4-channel DAC: 104 dB SNR and -90 dB THD+N
Complete stand-alone operation
• Self-boot from serial EEPROM
• Auxiliary ADC with four-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 I/O ports with I²S compatible, left-
justified, right-justified, and TDM modes
Sampling rates up to 192 kHz supported
On-chip voltage regulator for compatibility with 3.3 V
systems
48-lead LQFP plastic package
GENERAL DESCRIPTION
The ADAU1701 is a complete audio system-on-a-chip
including a 28/56-bit audio DSP, ADCs and DACs, and
microcontroller-like control interfaces. Signal processing
includes equalization, crossover, bass enhancement, multiband
dynamics processing, delay compensation, speaker
compensation, and stereo image widening. These algorithms
can be used to compensate for the real-world limitations of
speakers, amplifiers, and listening environments, resulting in a
dramatic improvement of perceived audio quality.
The signal processing used in the ADAU1701 is comparable to
that found in high end studio equipment. Most of the
processing is done in full 56-bit double-precision mode,
resulting in very good low level signal performance. The
ADAU1701 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
Rev. PrF
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rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
SigmaDSP^® 28/56-Bit Audio
Processor with 2ADC/4DAC
ADAU1701
APPLICATIONS
Multimedia speaker systems
MP3 player speaker docks
Automotive head units
Mini-component stereos
Digital televisions
Studio monitors
Speaker crossovers
Musical instrument effects processors
In-seat sound systems (aircraft/motor coaches)
FUNCTIONAL BLOCK DIAGRAM
PLL
DIGITAL DIGITAL ANALOG ANALOG PLL LOOP
3.3 V
VDD GROUND
VDD GROUND MODE FILTER
CRYSTAL
3
3
3
3
3
2
1.8 V
REGULATOR
CLOCK
PLL
OSCILLATOR
2-CHANNEL
ANALOG
INPUT
STEREO
ADC
S
DAC
FILTA /
ADC_RES 2
28/56-BIT, 50 MHz
DAC
AUDIO PROCESSOR CORE
40 ms DELAY MEMORY
RESET/
MODE
SELECT
CONTROL
INTERFACE
AND
SELFBOOT
8-CH
DIGITAL
INPUT
8-BIT
AUX
ADC
GPIO
8-CH
DIGITAL
OUTPUT
INPUT/OUTPUT MATRIX
RESET SELF
BOOT
5
I2C/SPI &
WRITEBACK
4
4
4
DIGITAL IN
OR
GPIO
AUX ADC
OR
GPIO
Figure 1.
DIGITAL OUT
OR
GPIO
FILTD / CM
2
4-CHANNEL
ANALOG
OUTPUT
filters, dynamics processors, level controls, and GPIO interface
controls.
ADAU1701 programs can be loaded on power-up either from a
serial EEPROM though 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
ADAU1701 to be recalled the next time the program is run.
The ADAU1701’s two sigma-delta (Σ-Δ ) ADCs and four Σ-Δ
DACs provide an analog-in to analog-out dynamic range
greater than 100 dB. The ADC’s THD+N is -80 dB and the
DAC’s is -90 dB. Digital input and output ports allow a glueless
connection to additional ADCs and DACs. The ADAU1701
communicates through either an I²C bus or a 4-wire SPI port.
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