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.
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AD1940/AD1941: SigmaDSP Multichannel 28-Bit Audio Processor Data Sheet (Rev B, 04/2010) (pdf, 817 kB)
|AN-1006: Using the EVAL-ADUSB2EBZ (pdf, 349 kB)||Application Notes|
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-087: Evaluating the AD1940 SigmaDSP Using the EVAL-AD1940MINIBZ (pdf, 796 kB)||User Guides|
Flexible Silicon: GUI-programmable Audio Processors—an EDN BenchPress Project
Flexible Silicon: GUI-programmable Audio Processors (Part 2)
Audio Processors, Amplifiers Deliver Complete HDTV Audio Subsystem
(EE Times, 10/1/2007)
ADI: Analog Essential To HDTV Experience
(Electronic Design, 10/1/2007)
|SigmaDSP® Audio Processors||Overview||HTML|
|RAQs index||Rarely Asked Questions||HTML|
|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|
|What is the difference between the AD1940 and AD1941?||FAQs/RAQs||HTML|
|What evaluation boards are available for the AD1940 and AD1941?||FAQs/RAQs||HTML|
|Why are the safeload registers five bytes long, while I'm loading four-byte parameters into the RAM using these registers?||FAQs/RAQs||HTML|
|How can I tune my own hardware design using SigmaStudio?||FAQs/RAQs||HTML|
|Where can I get further support for the SigmaDSP?||FAQs/RAQs||HTML|
|Glossary of EE Terms||Glossary||HTML|
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|Firmware Loader for SigmaDSPs||Device Drivers||HTML|
Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.
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