ADAU1702 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
ADAU1702
FEATURES
GENERAL DESCRIPTION
28-/56-bit, 25 MIPS digital audio processor
Two ADCs: SNR of 100 dB, THD + N of −83 dB
Four 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 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 ADAU1702 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
and can be used to compensate for real-world limitations of
speakers, amplifiers, and listening environments, providing a
dramatic improvements of 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 ADAU1702 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.
ADAU1702 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
ADAU1702 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 ADAU1702 communicates through an
I²C® bus or a 4-wire SPI® port.
FUNCTIONAL BLOCK DIAGRAM
PLL
DIGITAL DIGITAL ANALOG ANALOG PLL LOOP
VDD GROUND VDD GROUND MODE FILTER
3.3V
3
3
3
3
3
CRYSTAL
2
1.8V
REGULATOR
2-CHANNEL
ANALOG
INPUT
FILTA/
ADC_RES 2
STEREO
ADC
PLL
ADAU1702
28-/56-BIT, 25MIPS
AUDIO PROCESSOR CORE
10ms DELAY MEMORY
CLOCK
OSCILLATOR
DAC
DAC
FILTD/CM
2
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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