SigmaDSP® 28/56-Bit Audio
Processor with 2ADC/4DAC
ADAU1701
Preliminary Technical Data
FEATURES
APPLICATIONS
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
Multimedia speaker systems
MP3 player speaker docks
Automotive head units
Mini-component stereos
Digital televisions
•
•
Self-boot from serial EEPROM
Studio monitors
Speaker crossovers
Auxiliary ADC with four-input mux for analog
control
Musical instrument effects processors
In-seat sound systems (aircraft/motor coaches)
•
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
FUNCTIONAL BLOCK DIAGRAM
PLL
PLL for generating master clock from 64 × fS, 256 × fS,
384 × fS, or 512 × fS clocks
DIGITAL DIGITAL
VDD GROUND
3
ANALOG
VDD
3
PLL
LOOP
ANALOG
GROUND
3
3.3 V
MODE FILTER
CRYSTAL
3
3
2
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
1.8 V
REGULATOR
CLOCK
OSCILLATOR
PLL
FILTD / CM
2
2-CHANNEL
ANALOG
INPUT
STEREO
ADC
DAC
DAC
4-CHANNEL
ANALOG
OUTPUT
S
28/56-BIT, 50 MHz
AUDIO PROCESSOR CORE
40 ms DELAY MEMORY
FILTA /
ADC_RES
2
CONTROL
INTERFACE
AND
8-CH
DIGITAL
OUTPUT
RESET/
MODE
SELECT
8-CH
DIGITAL
INPUT
8-BIT
AUX
ADC
GPIO
SELFBOOT
INPUT/OUTPUT MATRIX
4
4
4
5
DIGITAL IN
OR
GPIO
AUX ADC
OR
GPIO
DIGITAL OUT
OR
GPIO
SELF
BOOT
RESET
I2C/SPI &
WRITEBACK
Figure 1.
GENERAL DESCRIPTION
filters, dynamics processors, level controls, and GPIO interface
controls.
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.
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.
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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.