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ADAU1445:  SigmaDSP® Digital Audio Processor with Flexible Audio Routing Matrix

Product Details

The ADAU1442/ADAU1445/ADAU1446 are enhanced audio processors that allow full flexibility in routing all input and output signals. The SigmaDSP® core features full 28-bit processing (56-bit in double-precision mode), synchronous parameter loading for ensuring filter stability, and 100% code efficiency with the SigmaStudio™ tools. This DSP allows system designers to compensate for the real-world limitations of speakers, amplifiers, and listening environments, resulting in a dramatic improvement of the perceived audio quality through speaker equalization, multiband compression, limiting, and third-party branded algorithms.

The flexible audio routing matrix (FARM) allows the user to multiplex inputs from multiple sources running at various sample rates to or from the SigmaDSP core. This drastically reduces the complexity of signal routing and clocking issues in the audio system. FARM includes up to eight stereo asynchronous sample rate converters (depending on the device model), Sony/ Philips Digital Interconnect Format (S/PDIF) input and output, and serial (I2S) and time division multiplexing (TDM) I/Os. Any of these inputs can be routed to the SigmaDSP core or to any of the asynchronous sample rate converters (ASRCs). Similarly, any one of the output signals can be taken from the SigmaDSP core or from any of the ASRC outputs. This routing scheme, which can be modified at any time via control registers, allows for maximum system flexibility.

The ADAU1442, ADAU1445, and ADAU1446 differ only in ASRC functionality and packaging. The ADAU1442/ADAU1445 contain 16 channels of ASRCs and are packaged in TQFP packages, whereas the ADAU1446 contains no ASRCs and is packaged in an LQFP. The ADAU1442 can handle nine clock domains, the ADAU1445 can handle three clock domains, and the ADAU1446 can handle one clock domain.

The ADAU1442/ADAU1445/ADAU1446 can be controlled in one of two operational modes: the settings of the chip can be loaded and dynamically updated through the SPI/I2C® port, or the DSP can self-boot from an external EEPROM in a system with no microcontroller. There is also a bank of multipurpose (MP) pins that can be used as general-purpose digital I/Os or as inputs to the 4-channel auxiliary control ADC.

The ADAU1442/ADAU1445/ADAU1446 are supported by the SigmaStudio graphical development environment. This software includes audio processing blocks such as FIR and IIR filters, dynamics processors, mixers, low level DSP functions, and third-party algorithms for fast development of custom signal flows.


  • Automotive audio processing
    Head units
    Navigation systems
    Rear-seat entertainment systems
    DSP amplifiers (sound system amplifiers)
  • Commercial audio processing

Data Sheet, Rev. B, 04/10


  • Fully programmable audio digital signal processor (DSP) for enhanced sound processing
  • Features SigmaStudio™, a proprietary graphical programming tool for the development of custom signal flows
  • 172 MHz SigmaDSP core; 3584 instructions per sample at 48 kHz
  • 4k parameter RAM, 8k data RAM
  • Flexible audio routing matrix (FARM)
    24-channel digital input and output
    Two 8-channel asynchronous sample rate converters (from 1:8 up to 7.75:1 ratio and 139 dB DNR)
    Stereo S/PDIF input and output
  • Supports serial and TDM I/O, up to fS = 192 kHz
  • See data sheet for additional information

ADAU1445 Functional Block Diagram

For evaluating the ADAU1445, please use the EVAL-ADAU1442EBZ. The ADAU1445 only differs from the ADAU1442 in the number of ASRCs. You can get further information from the SigmaDSP FAQ. If your questions are not answered there, direct any SigmaDSP support inquiries to the SigmaDSP support forum on EngineerZone.


Title Content Type File Type
ADAU1442/ADAU1445/ADAU1446: SigmaDSP Digital Audio Processor with Flexible Audio Routing Matrix Data Sheet (Rev D, 11/2013) (pdf, 968 kB) Data Sheets PDF
AN-951: Using Hardware Controls with SigmaDSP GPIO Pins  (pdf, 439 kB) Application Notes PDF
AN-1006: Using the EVAL-ADUSB2EBZ  (pdf, 349 kB) Application Notes PDF
Sigma Studio Overview
Familiar audio processing blocks can be wired together as in a schematic, and the compiler generates DSP-ready code and a control surface for setting and tuning parameters.
Videos HTML
VisualDSP++ 5.0 Linker and Utilities Manual (Revision 3.5, January 2011)  (pdf, 2290 kB) | Request a CD Software Manuals PDF
UG-032: Evaluation Board User Guide for ADAU1442, ADAU1445, and ADAU1446 SigmaDSP Products  (pdf, 1828 kB) User Guides PDF
Which SigmaDSP is right for my application? FAQs/RAQs HTML
Which SigmaDSP parts are qualified for automotive applications? FAQs/RAQs HTML
What evaluation boards are available for the SigmaDSP processors? FAQs/RAQs HTML
What advanced algorithms are available for SigmaDSP? FAQs/RAQs HTML
What is needed to boot a SigmaDSP processor? FAQs/RAQs HTML
What is the processing power and RAM sizes of the different SigmaDSPs? FAQs/RAQs HTML
How can I program and tune my target application using SigmaStudio? FAQs/RAQs HTML
When should I use double precision and when should I use single precision filters? FAQs/RAQs HTML
How do I protect my SigmaDSP design against power supply overvoltage and ESD? FAQs/RAQs HTML
How can I get a copy of SigmaStudio? FAQs/RAQs HTML
I already have a copy of SigmaStudio. How can I get the latest version? FAQs/RAQs HTML
Where can I find a description of the changes made in the latest version of SigmaStudio? FAQs/RAQs HTML
What are the PC requirements for SigmaStudio? FAQs/RAQs HTML
What documentation is available for SigmaStudio? FAQs/RAQs HTML
Can I use SigmaStudio without hardware connected? FAQs/RAQs HTML
How can I write my own algorithms in SigmaStudio? FAQs/RAQs HTML
After I link-compile-download my project, the bar at the bottom of SigmaStudio turns green. Does this mean my program downloaded to the DSP successfully? FAQs/RAQs HTML
How can I check that I have proper communication between SigmaStudio and the SigmaDSP hardware? FAQs/RAQs HTML
How can I see exactly what SigmaStudio is writing to the target hardware? FAQs/RAQs HTML
How do I change the sampling rate of my design in SigmaStudio? FAQs/RAQs HTML
Where can I see how much of the SigmaDSP resources my project consumes? FAQs/RAQs HTML
My signal flow is running out of instructions. What can I do to save resources? FAQs/RAQs HTML
I can't use the maximum delay memory in my project. What's happening? FAQs/RAQs HTML
When the signal input to my compressor is above 6 dB, the compression stops and my signal starts increasing. What's happening? FAQs/RAQs HTML
How can I eliminate pops when changing the delay parameter at run-time? FAQs/RAQs HTML
My application requires that I use multiple blocks that generate many addresses that I then have to map to my microcontroller code. Can I fix specific memory addresses for specific blocks to avoid all this mapping overhead? FAQs/RAQs HTML
How can I tune my own hardware design using SigmaStudio? FAQs/RAQs HTML
Can I use selfboot to load multiple different programs? FAQs/RAQs HTML
What is the difference between the ADAU1442, ADAU1445, and ADAU1446? FAQs/RAQs HTML
What evaluation boards are available for the ADAU144x products? FAQs/RAQs HTML
Where can I get further support for the SigmaDSP? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADAU144x IBIS Models IBIS Models HTML
Firmware Loader for SigmaDSPs Device Drivers HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Audio DAC for the ADAU1445
  • For a high performance, 16-channel, differential output DAC, we recommend the ADAU1966.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

ADAU1445 Model Options
Price Table Help

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.

ADAU1442 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADAU1442EBZ Status: Production Evaluation Board $599.00 Yes -

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.

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