EVAL-AD7470_15 datasheet(9/20 Pages) AD

Part #	EVAL-AD7470

Description	Evaluation Board for 10-/12-Bit High Speed, Low Power ADCs

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Manufacturer	AD [Analog Devices]

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EVAL-AD7470/AD7472

Rev. C | Page 9 of 20

The upper third of the dialog box contains the control buttons,

the menu bar, and the status windows. The control buttons

allow the user to take samples, reset the part, and quit the

program. The menu bar allows the user to enter the setup

menu, select which printer port is to be used to control the

EVAL-CONTROL BRD2, load and save data, and get informa-

tion about the software. The status window indicates the setup

of the evaluation board/device, the number of samples taken,

and any information or error messages are generated.

The middle third of the AD7470/AD7472 main dialog box is a

digital storage oscilloscope (DSO). When samples are uploaded

from the EVAL-CONTROL BRD2, they are displayed here. The

samples can be displayed either as integer values or as voltages.

Once the samples are displayed, clicking any point on the graph

displays the sample number and the value of the point directly

beneath the cursor. Along the axis of the graph are the zoom

handles; these allow you to zoom in and out to get a closer look

at a particular sample if required. When another set of samples

is taken the graph attempts to display all values collected unless

the Hold Zoom check box is ticked. If the Hold Zoom box is

ticked, the graph keeps the same axis settings as for the previous

set of data samples. There are additional check boxes in this

section to give you control over the vertical grids, horizontal

grids, and data points.

The lower third of the dialog box shows either a fast Fourier

transform (FFT) of the data, or a histogram, which shows the

number of occurrences of each particular code read back. The

FFT (the default option) is typically used when you are examin-

ing an ADC’s performance in the frequency domain, while the

histogram gives an indication of the ADC’s performance to DC

signals. The option displayed can be changed by clicking the

FFT Mode/Histogram Mode

button in the top right of the

dialog box. Figure 5 shows the main dialog box when histogram

mode is selected.

Taking Samples

Clicking Sample instructs the EVAL-CONTROL BRD2 to take

the required number of samples at the required frequency from

the evaluation board. These samples are then uploaded and

displayed. An FFT and histogram are also calculated and

displayed. If you click Cont Samp, the software repeats the

process indefinitely until the user clicks the button Stop Samp.

While the software is continuously sampling data the other

control buttons are disabled.

Reset Button

The Reset button causes the EVAL-CONTROL BRD2 to

perform a reset function. When this happens, the power

supplies are turned off and the program in DSP memory is

lost. Repeat the setup instructions to download another

program if required.

Quit Button

The Quit button exits the software. The program running on

the EVAL-CONTROL BRD2 is not terminated.

MENU BAR

The main dialog box of the EVAL-CONTROL BRD2 contains

a number of options available as pull-down menu items.

File Menu

Setup Menu:

Displays the setup dialog box as shown in

Figure 3.

Load Raw Data:

Allows the user to load data, which had been

saved by the software during a previous session.

Save Raw Data:

Allows the user to save the current set of

sample data points. The data can be reloaded to the EVAL-

CONTROL BRD2 software at a later date or can be used by

other programs for further analysis.

Save Binary Data:

Allows the user to save the current set of

sample data points. The data is saved in binary format as a text

file. This method can be useful for examining code flicker, and

looking for stuck bits.

Save FFT Data:

Allows the user to save the current set of FFT

data points. FFT data cannot be reloaded into the EVAL-

CONTROL BRD2 software, but can be loaded into other

software packages for further analysis.

Exit:

Quits the program.

Printer Port

This menu item allows you to select which printer port to use

for communicating with the EVAL-CONTROL BRD2.

LPT1:

This option selects 0x378 as the printer port address.

This is the default option.

LPT2:

This option selects 0x278 as the printer port address.

PRN:

This option selects 0x3BC as the printer port address.

Help

This menu item gives information about the current revision of

software for the particular evaluation board being used.

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EVAL-AD7470 Datasheet(PDF) 9 Page - Analog Devices

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