SigmaDSP® Multichannel 28-Bit Audio Processor

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Product Details

The AD1940/AD1941 are a complete 28-bit, single-chip, multi-channel audio SigmaDSP™ for equalization, multiband dynamic processing, delay compensation, speaker compensation, and image enhancement. These algorithms can be used to compen-sate 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 AD1940/AD1941 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 and the absence of limit cycles or idle tones. The dynamics processor uses a sophisticated, multiple-breakpoint algorithm often found in high end broadcast compressors.

The AD1940/AD1941 are a fully programmable DSP. Easy to use software allows the user to graphically configure a custom signal processing flow using blocks such as biquad filters, dyna-mics processors, and surround sound processors. An extensive control port allows click-free parameter updates, along with readback capability from any point in the algorithm flow.

The AD1940/AD1941’s digital input and output ports allow a glueless connection to ADCs and DACs by multiple, 2-channel serial data streams or TDM data streams. When in TDM mode, the AD1940/AD1941 can input 8 or 16 channels of serial data, and can output 8 or 16 channels of serial data. The input and output port configurations can be individually set. The AD1940 is controlled by a 4-wire SPI® port; the AD1941 is controlled by a 2-wire I2C® bus. Other than the control interface, the functions of the two parts are identical.


  • Automotive sound systems
  • Digital televisions
  • Multichannel audio systems
  • Mini-component stereos
  • Multimedia audio
  • Digital speaker crossover
  • Musical instruments
  • In-seat sound systems (aircrafts/motor coaches)

Product Lifecycle

recommend Last Time Buy

All products in this family will be obsolete soon. Please contact ADI Sales or Distributors to arrange for final purchases and read our Obsolescence Information to review the time periods for placing final orders and receiving final shipments.

Evaluation Kits


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Product Details

Full-Featured AD1940 SigmaDSP evaluation board with AD1939 and AD1974 Codecs. It provides buffered analog inputs and ouptuts as well as S/PDIF and digital I2S/TDM connectors. 6 V power supply and USBi are included in the package.

Small AD1940 SigmaDSP evaluation board with AD1938 Codec and buffered analog inputs and outputs. 6 V power supply and USBi are included in the package. This is the recommended evaluation board for the AD1940. The EVAL-AD1940AZ can be used if this board lacks some necessary functionality or interface.

Software & Systems Requirements


Software Development Tools

Tools & Simulations

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Product Recommendations

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AD1941 Companion Parts

Recommended Audio DAC

  • For a high performance, 16-channel, differential output DAC: ADAU1966.

Recommended I2S MEMS Microphone

  • For a high performance, low power, complete microphone solution: ADMP441.

Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD1941 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints


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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.

Price Table Help

Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.