ANALOG DEVICES UG-177 Service Manual

Evaluation Board User Guide

One Technology Way • P. O . Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel : [phone] • Fax : [phone] • www.analog.com

UG-177

Evaluating the ADAU1781 SigmaDSP using the EVAL-ADAU1781Z

EVAL-ADAU1781Z PACKAGE CONTENTS

ADAU1781 evaluation board
EVAL-ADUSB2EBZ (USBi) communications adapter
USB cable with Mini-B plug
Evaluation board/software quick-start guide

DOCUMENTS NEEDED

ADAU1781 data sheet
ADMP401 data sheet
AN-1006 Applications Note, Using the EVAL-ADUSB2EBZ

EVALUATION BOARD TOP SIDE AND BOTTOM SIDE

GENERAL DESCRIPTION

This user guide explains the design and setup of the ADAU1781
SigmaDSP® evaluation board.

This evaluation board provides full access to all analog and digital
I/Os on the ADAU1781. The SigmaDSP is controlled by Analog
Devices, Inc., SigmaStudio™ software, which interfaces to the
board via a USB connection. This evaluation board can be
powered either over the USB bus or by a single 3.8 V to 6 V
supply, which is regulated to the voltages required on the board.
The PC board is a 4-layer design, with a single ground plane and a
single power plane on the inner layers. The board contains on­board microphones and speaker, and connectors for external
microphones and speaker. The master clock can be provided
externally or by the on-board 12.288 MHz active oscillator.

Figure 1. Evaluation Board Top Side

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

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Figure 2. Evaluation Board Bottom Side

UG-177 Evaluation Board User Guide

TABLE OF CONTENTS

EVAL-ADAU1781Z Package Contents .......................................... 1

Documents Needed .......................................................................... 1

General Description ......................................................................... 1

Evaluation Board Top Side and Bottom Side ................................ 1

Revision History ............................................................................... 2

Evaluation Board Block Diagrams ................................................. 3

Setting Up the Evaluation Board .................................................... 5

Installing the SigmaStudio Software .......................................... 5

Installing the USBi Drivers ......................................................... 5

Default Switch and Jumper Settings .......................................... 5

Powering Up the Board ............................................................... 6

Connecting the Audio Cables ..................................................... 6

Setting Up Communications in SigmaStudio ........................... 6

Configuring the Registers ........................................................... 6

Creating a Basic Signal Flow ........................................................7

Downloading the Program to the DSP.................................... 10

Using the Evaluation Board .......................................................... 11

Power ............................................................................................ 11

Master Clock ............................................................................... 11

Inputs and Outputs .................................................................... 11

GPIO ............................................................................................ 11

Serial Audio Interface ................................................................ 11

Communications Header .......................................................... 11

Power-Down ............................................................................... 11

Evaluation Board Schematics and Artwork ................................ 12

Ordering Information .................................................................... 21

Bill of Materials ........................................................................... 21

REVISION HISTORY

7/10—Revision 0: Initial Version

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Evaluation Board User Guide UG-177

EVALUATION BOARD BLOCK DIAGRAMS

POWER
SUPPLY

REGULATION

BEEP

INPUT

ANALOG MI C

INPUTS

STEREO LINE

INPUT

DIGITAL MIC

INPUTS

SERIAL AUDIO

CONNECTOR

ACTIVE

OSCILLATOR

I2S/SPI

COMMUNICATIONS

HEADER

ADAU1781
SigmaDSP

MASTER CLOCK

SELECTOR

SPEAKER

CONNECTOR

ON-BOARD

SPEAKER

HEADPHONE

OUTPUT

SERIAL AUDIO

CONNECTOR

GPIO

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Figure 3. Functional Block Diagram

POWER

COMMUNICATIONS

HEADER

SERIAL AUDI O

CONNECTOR

SPEAKER

GPIO

MCLK

SPEAKER
OUTPUTS

HEADPHONE
OUTPUT

SELECT

ADAU1781
SigmaDSP

BEEP/MIC/STEREO LINE

INPUTS

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Figure 4. Board Layout Block Diagram

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UG-177 Evaluation Board User Guide

OSC

ST

IN

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Figure 5. Default Jumper and Switch Settings (A Solid Black Rectangle Indicates a Switch or Jumper Position)

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Evaluation Board User Guide UG-177

SETTING UP THE EVALUATION BOARD

INSTALLING THE SigmaStudio SOFTWARE

Users can download the latest version of SigmaStudio by
completing the following steps:

1. Go to www.analog.com/sigmastudiodownload and fill in

the Email: and Software Key: boxes. You will get a
software key with the evaluation board, or you can contact
Analog Deviecs, Inc., at [e-mail] to request a
software key.

2. Chose which version of SigmaStudio you would like and

click Submit.

3. Download the installer file, open the file, and extract the

files to your PC.

4. Install the Microsoft .NET Framework if you do not

already have it installed.

5. Install SigmaStudio by double-clicking setup.exe and

follow the prompts.

Click Search for the best driver in these locations, select
Include this location in the search, and click Browse to find
the SigmaStudio 3.0\USB drivers directory (see Figure 8).

INSTALLING THE USBi DRIVERS

SigmaStudio must be installed to use the USBi. When
SigmaStudio has been properly installed, connect the USBi
to an available USB port with the included USB cable. At this
point, Windows® XP recognizes the device and prompts the
user to install drivers (see Figure 6).

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Figure 6. Found New Hardware Notification

Select the Install from a list or specific location (Advanced)
option and click Next > (see Figure 7).

Figure 8. Windows Found New Hardware Wizard—Search and

Installation Options

When the warning about Windows Logo testing appears, click
Continue Anyway (see Figure 9).

Figure 9. Windows Logo Testing Warning

The USBi drivers should now be installed successfully. Leave
the USBi connected to the PC.

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Figure 7. Found New Hardware Wizard—Installation

DEFAULT SWITCH AND JUMPER SETTINGS

By default, the evaluation board is configured for single-ended

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stereo analog input and headphone output.

The J1, J10, J11, J13, and J14 jumpers must be connected. The
GPIO jumper (J7) can be connected as desired to use GPIO
circuitry.

Switch S3 (MCKI SOURCE) should be in the up (OSC)
position, and Switch S4 (IN SELECT) should be in the
right (ST_IN) position.

UG-177 Evaluation Board User Guide

POWERING UP THE BOARD

To power up the board, connect the ribbon cable of the USBi
to J2 (CONTROL PORT) of the EVAL-ADAU1781Z.

CONNECTING THE AUDIO CABLES

Connect a stereo audio source to J19 (ST IN). Connect head­phones or powered speakers to J18 (HP OUT). The labels for
J18 and J19 are only visible on the bottom of the board.

SETTING UP COMMUNICATIONS IN SIGMASTUDIO

Start SigmaStudio by double-clicking the shortcut on the desktop.

Click File…New Project or press Ctrl+N to create a new project.
The default view of the new project is called the Hardware
Configuration tab.

To use the USBi in conjunction with SigmaStudio, first select it
in the Communication Channels subsection of the toolbox on the
left side of the Hardware Configuration tab, and add it to the project
space by clicking and dragging it to the right (see Figure 10).

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Figure 10. Adding the USBi Communication Channel

If SigmaStudio cannot detect the USBi on the USB port of the
computer, then the background of the USB label will be red
(see Figure 11). This may happen when the USBi is not connected
or when the drivers are incorrectly installed.

If SigmaStudio detects the USBi on the USB port of the computer,
the background of the USB label changes to orange (see Figure 12).

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Figure 12. USBi Detected by SigmaStudio

To add an ADAU1781 to the project, select it from the
Processors (ICs / DSPs) list and drag it to the project space
(see Figure 13).

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Figure 13. Adding an ADAU1781

To use the USB interface to communicate with the target IC,
connect it by clicking and dragging a wire between the blue pin
of the USBi and the green pin of the IC (see Figure 14). The
corresponding drop-down box of the USBi automatically fills
with the default mode and channel for that IC.

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Figure 11. USBi Not Detected by SigmaStudio

CONFIGURING THE REGISTERS

To access the graphical register control window, click the IC 1 –
SigmaLP2 Register Controls tab near the bottom of the

window (see Figure 15).

Within the register control view, there are several tabs at the top
for easy navigation. Start with the Codec Setup tab (see Figure 16).

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Figure 14. Connecting the USB Interface to an ADAU1781 IC

Figure 15. Register Control Tab

Figure 16. Codec Setup Register Tab

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9

In the Automatic Startup section, click Load Preset (see Figure 17).

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Figure 17. Load Preset Button

If the board is connected and powered and the USBi drivers are
installed correctly, the PLL Lock Bit indicator to the left of the

Load Preset button should change to green to indicate that it is
Locked (see Figure 18).

The rest of the register settings can remain at their default values.

CREATING A BASIC SIGNAL FLOW

To acc es s the Schematic tab, where a signal processing flow
can be created, click the Schematic tab at the top of the screen
(see Figure 21).

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Figure 21. Schematic Tab

The left side of the schematic view includes the Tree Tool box,
which contains all of the algorithms that can run in the
SigmaDSP. Select the Input cell from within the IO > Input
folder (see Figure 22).

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Figure 18. PLL Lock Indicator

Click on the Record Input Signal Path tab (see Figure 19).

Figure 19. Record Input Signal Path

In the Record Gain Left (PGA) and Record Gain Right (PGA)
sections, the Single ended Input Enable controls are disabled by
default. Click each button once to enable the single-ended input
(see Figure 20).

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Figure 22. Input Cell Selection

Click and drag the Input cell into the blank schematic space to
the right of the Tree Toolb ox (see Figure 23).

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Figure 23. Input Cell

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Figure 20. Record Path Controls

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UG-177 Evaluation Board User Guide

Navigate to the IO > Output folder and select the Output cell
(see Figure 24).

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Figure 24. Output Cell Selection

Click and drag an output cell to the schematic. Do this again to
create two outputs (see Figure 25).

Click and drag this cell to the schematic (see Figure 27).

Figure 27. Volume Control Cell

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By default, this cell only has one input channel and one output
channel, as indicated by the green input and right output dots.
To add a channel, right-click in the blank white part of the cell
and select Grow Algorithm > 1. Gain (RC slew) Growable DP > 1
from the menu (see Figure 28).

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Figure 25. Output Cells

Navigate to the Volume Controls > Adjustable Gain > Single/
Multiple Controls/Clickless SW Slew folder and select the
Growable Single Vol Ctrl cell (see Figure 26).

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Figure 26. Volume Control Cell Selection

Figure 28. Growing the Volume Control

The cell should now have two inputs and two outputs (see
Figure 29).

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Figure 29. Stereo Volume Control Cell

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