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UG-072
Evaluation Board User Guide
YOUR FIRST SIGMASTUDIO PROJECT—EQ AND
VOLUME CONTROL
The following is a procedure for building your first project in
SigmaStudio and running it on the evaluation board. This
procedure creates a simple design that creates a volume control
and five-band EQ on a stereo input signal.
1. Create a new project. SigmaStudio opens to the Hardware
Configuration Tab.
2. Drag a SigmaDSP IC ( ADAU1401A, ADAU1701,
ADAU1702, or ADAU1401) , E2Prom , and a USBi cell
into the blank white space.
Note: If you are using a processor other than the
ADAU1401A, (for example, ADAU1701 or ADAU1702 ),
drag that processor out instead.
3. Connect the USBi cell to the ADAU1401A (or other
SigmaDSP) cell by clicking and dragging from the top blue
output pin to the green input pin.
4. Connect the second USBi blue output pin to the green
input pin on the E2Prom cell.
The screen should appear as it does in Figure 3.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Click the Schematic tab at the top of the screen.
In the Tree ToolBox section, expand the IO > Input . Click
and drag an Input cell to the work area.
Similarly, expand Filters > Second Order > Double
Precision > 2 Ch and click and drag Medium Size Eq to
the work area.
Right-click the general (second-order) cell labeled Gen
Filter1 .
Click Grow Algorithm > 1 . 2 Channel – Double
Precision > 4. This creates a five-band equalizer (EQ).
Each band’s general filter settings can be modified by
clicking the blue boxes on the cell.
Expand Volume Controls > Adjustable Gain > Shared
Slider > Clickless SW Slew and click and drag Single slew
Expand the IO > Output . Click and drag two Output cells
For each of the outputs, select a DAC output by clicking the
pull-down box. DAC0 and DAC1 are left and right
outputs, 0 and 1, from the ADAU1401A (output on J1 as
marked in green in Figure 2), respectively. DAC2 and
DAC3 are left and right channel, respectively for the
second stereo line output (J3 on the board).
Connect all the cells as depicted in Figure 4.
Make sure the board is powered and connected to the PC.
Click the Link-Compile-Download button in the
SigmaStudio toolbar, or select Link-Compile-Download
from the Action menu.
If the project compiled without error, you will be in Ready-
Download mode.
Your screen should now appear as it does in Figure 4.
16. Play your audio source; audio should now be available.
Move the volume control and filter sliders and hear the
Figure 3. Hardware Configuration Tab
effect on the output audio in real time.
Figure 4. Schematic Tab, Full Design
Rev. A | Page 4 of 20
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