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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 and can be used to compensate for real-world limitations of speakers, amplifiers, and ...More

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

Product Description

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.

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)

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    • 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
    • Please see data sheet for additional features
    • Instructions/Cycles: 512
    • DAC DNR (dB): 104dB
    • DAC THD+N @ 1 kHz (-3dB): 90dB
    • Digital I/O Channels: 8/8
    • Analog I/O Channels: 2/4
    • Product Description: SigmaDSP 28/56-Bit Audio Processor with 2 ADC/4 DAC

    Functional Block Diagram for ADAU1702

    For evaluating the ADAU1702, please use the EVAL-ADAU1701MINIZ. The ADAU1702 only differs from the ADAU1701 in program and data memory size. You can get further information from the SigmaDSP FAQ. If your questions are not answered there, direct any SigmaDSP support inquiries to sigmadsp@analog.com.

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    Part# Instructions/Cycles DAC DNR (dB) DAC THD+N @ 1 kHz (-3dB) ADC DNR (dB) ADC THD+N (dB) Digital I/O Channels Analog I/O Channels Product Description Price* (1000-4999)
    AD1940 1,536 n/a n/a - - 16/16 0/0 SigmaDSP Multichannel 28-/56-Bit Audio Processor w/ 4-Wire SPI ® control interface. $8.45
    AD1941 1,536 n/a n/a - - 16/16 0/0 SigmaDSP Multichannel 28-/56-Bit Audio Processor w/ 2-wire I2C ® control interface. $8.45
    AD1953 512 112 100 - - 4/6 0/3 SigmaDSP 3 Ch, 26-/48-Bit Processing D/A $7.14
    AD1954 512 112 100 - - 4/2 0/3 SigmaDSP 3 Ch, 26-/48-Bit Processing D/A $7.14
    ADAU1401 1,024 104 90 100 -83 8/8 2/4 28/56-Bit Automotive Audio Processor with Two ADCs and Four DACs $5.68
    ADAU1445 3,584 - - - - 24/24 - SigmaDSP® Digital Audio Processor with Flexible Audio Routing Matrix, 2 x 8-ch ASRC $9.31
    ADAU1446 3,584 - - - - 24/24 - SigmaDSP® Digital Audio Processor with Flexible Audio Routing Matrix, 2 x 8-ch ASRC $8.28
    ADAU1701 1,024 104 90 100 -83 8/8 2/4 SigmaDSP® 28/56-Bit Audio Processor with Two ADCs and Four DACs $4.52
    ADAU1702 512 104 90 100 -83 8/8 2/4 SigmaDSP 28/56-Bit Audio Processor with 2 ADC/4 DAC $3.57
    ADAU1761 1,024 99 90 101 -92 8/8 2/2 SigmaDSP® Stereo, Low Power, 96 kHz, 24-Bit Audio Codec with Integrated PLL $3.91
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    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.