Add to Signal Chain Designer

ADAU1781:  SigmaDSP Low-noise Stereo Audio Codec for Portable Applications

Product Details

Product Status:Recommended for New Designs

The ADAU1781 is a low power, 24-bit stereo audio codec. The low noise DAC and ADC support sample rates from 8 kHz to 96 kHz. Low current draw and power saving modes make the ADAU1781 ideal for battery-powered audio applications.

A programmable SigmaDSP® core provides enhanced record and playback processing to improve overall audio quality.

The record path includes two digital stereo microphone inputs and an analog stereo input path. The analog inputs can be configured for either a pseudo differential or a single-ended stereo source. A dedicated analog beep input signal can be mixed into any output path. The ADAU1781 includes a stereo line output and speaker driver, which makes the device capable of supporting dynamic speakers.

The serial control bus supports the I2C® or SPI protocols, and the serial audio bus is programmable for I2S, left-justified, right-justified, or TDM mode. A programmable PLL supports flexible clock generation for all standard rates and available master clocks from 11 MHz to 20 MHz.


  • Digital still cameras
  • Digital video cameras


  • Programmable SigmaDSP core for audio processing
  • 24-bit stereo audio ADC and DAC
  • 400 mW speaker amplifier (into 8 Ω load)
  • Optional stereo digital microphone input pulse-density modulation (PDM)
  • PLL supporting a range of input clock rates
  • Stereo pseudo-differential microphone input
  • Stereo line output
  • Please see data sheet for additional features.

Functional Block Diagram for ADAU1781


Title Content Type File Type
ADAU1781: Low Noise Stereo Codec with SigmaDSP Processing Core (Rev B, 01/2011) (pdf, 937 kB) Data Sheets PDF
AN-951: Using Hardware Controls with SigmaDSP GPIO Pins  (pdf, 439 kB) Application Notes PDF
AN-1056: Capless Headphone Virtual Ground Short-Circuit Protection for the ADAU1361 and ADAU1761 Low Power Codecs  (pdf, 77 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-177: Evaluating the ADAU1781 SigmaDSP using the EVAL-ADAU1781Z  (pdf, 1220 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
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
Where can I get further support for the SigmaDSP? FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADAU1781 Sound CODEC Linux Driver Device Drivers 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

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.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

Were these recommendations helpful?

SampleSample & Buy

Price, packaging, availability

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.

ADUSB2EBZ Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADUSB2EBZ Status: Production USB Interface $80.00 Yes -
ADAU1781 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADAU1781Z Status: Production Evaluation Board $249.00 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.

Check Inventory & Purchase

View Sales and Distribution Offices

content here.
content here.

Review this Product