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.
Data Sheet, Rev. B, 04/10
|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|
|AN-1325: High Performance Digital MEMS Microphone’s Simple Interface to SigmaDSP Audio Processor with I2S Out (pdf, 166 kB)||Application Notes|
|AN-951: Using Hardware Controls with SigmaDSP GPIO Pins (pdf, 439 kB)||Application Notes|
|AN-1006: Using the EVAL-ADUSB2EBZ (pdf, 349 kB)||Application Notes|
|CN-0208: High Performance Digital MEMS Microphone's Simple Interface to SigmaDSP Audio Processor with I2S Output (pdf, 361 kB)||Circuit Note|
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.
|VisualDSP++ 5.0 Linker and Utilities Manual (Revision 3.5, January 2011) (pdf, 2290 kB) | Request a CD||Software Manuals|
|UG-032: Evaluation Board User Guide for ADAU1442, ADAU1445, and ADAU1446 SigmaDSP Products (pdf, 1828 kB)||User Guides|
|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|
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