EVAL-AD7997EBZ/AD7998EBZ

Rev. 0 | Page 7 of 12

MAIN WINDOW

The upper and left portion of the evaluation board window

contains a menu bar and controls. The middle-right and

bottom-right portions contain digital storage oscilloscopes

(DSOs).

Menu Bar

The menu bar (not visible in Figure 2) consists of the File and

About

menus.

File Menu

Print front Panel.

Prints front panel on active printer.

Save as Picture.

Saves front panel as a .jpg file.

Exit.

Exits the program.

About Menu

Analog.com.

Opens Analog Devices Web page.

Software Version.

Displays information about the current

version of the software.

Controls

The controls include control buttons, list boxes, and indicators.

Sample.

Samples selected channels.

Continuous.

Repeats the sampling process.

Limit.

Opens window to configure limit registers (Channel 1 only).

Sweep.

Starts the sweep function.

LEDs (CH1, CH2, … CH8).

Selects the input channel of the

AD7997/AD7998. When more than one channel is selected, the

AD7997/AD7998 work in sequence mode.

Load Firmware.

Loads the firmware to the Cypress USB device.

Temperature.

Enables temperature measurements.

Potentiometer Value Selector (Pot 1/Pot 2).

Changes the value

of the selected digital potentiometer.

Codes/Volts

. Determines whether data is displayed in codes

or volts.

Exit.

Exits the program.

Alert LED.

Indicates if an alert occurred (Channel 1 only).

Ref – VDD – 5V

. Selects reference voltage source (power

supply voltage or AD780).

2.5V/3V.

Changes the value of the external reference voltage

(AD780).

Clear Charts.

Clears the charts displayed.

Autoscale On/Autoscale Off.

Click this button to turn the

autoscale feature on or off.

Alert.

Shows limits on the upper digital storage oscilloscope.

Channel 1/Channel 2/…/Channel 8.

Selects the input channel

of the AD7797/AD7798 for the sweep function.

Digital Storage Oscilloscopes

The middle portion of the evaluation board window displays

a waveform. When samples are uploaded from the evaluation

board, they are displayed here. At the bottom left of the upper

DSO are zoom options that allow you to zoom in and out while

viewing a sample. To the left of this DSO, information about the

sample taken is displayed, such as measured values in codes and

in volts.

The lower portion of the main window displays a waveform

of the sweep function. At the bottom left of the lower DSO

are zoom options that allow you to zoom in and out while

viewing a sample. To the right of the DSO, information about

the sample taken and the value of each point of sweep function

is displayed.

Taking Samples

During the sweep function, 256 samples are taken directly

from the digital potentiometer output. The output of the digital

potentiometer is incremented by 1, from 0 to 255, and for each

increment, the AD7997/AD7998 take a sample. After the

measurement, all 256 values are displayed on the digital storage

oscilloscope in the lower portion of the main window (see

Figure 2).

To instruct the AD7997/AD7998 to take samples click either

Sample

or Continuous.

•

Click Sample to perform one conversion. The result is

uploaded and displayed.

•

Click Continuous to start taking samples. When

Continuous

is selected, other controls can be changed.