ADAU1702 SigmaDSP® 28-/56-Bit Audio Processor with Two ADCs and Four DACs

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. 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 end studio equipment. Most processing is done in full 56-bit, double precision mode, resulting in very good low level signal perfor-mance. 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.

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)

Features and Benefits

28-/56-bit, 25 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
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 a master clock from 64 × fS, 256 × fS, 384 × fS, or 512 × fSclocks
Please see data sheet for additional features

Processors & DSP

SigmaDSP Audio Processors

Audio & Video Products

Audio Signal Processors

Data Sheets

Document	note
ADAU1702: SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs Data Sheet (Rev. D)	PDF 1.16 M

Application Notes

Document	note
AN-951: Using Hardware Controls with SigmaDSP GPIO Pins (Rev. A)	PDF 439 kB
AN-1006: Using the EVAL-ADUSB2EBZ (Rev. A)	PDF 349 kB
AN-923: Designing a System Using the ADAU1701/ADAU1702 in Self-Boot Mode (Rev. 0)	PDF 134 kB