EVAL-AD7472CB Datasheet, PDF(9/14 Page) Analog Devices – Evaluation Board for 12-bit high speed, low power, successive-approximation ADC

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EVAL-AD7472CB Datasheet, PDF (9/14 Pages) Analog Devices – Evaluation Board for 12-bit high speed, low power, successive-approximation ADC

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EVAL-AD7472CB

DIGITAL STORAGE OSCILLOSCOPE.

When samples of data are captured, they are displayed on the

Digital Storage Oscilloscope. If the blackman-harris button

is turned on then the windowed data is also displayed on the

oscilloscope. The 'scope has been designed to act in a similar

way as a conventional oscilloscope. To the right of the

oscilloscope are several buttons that control the manner in

which data is displayed on the 'scope. The timebase for the

oscilloscope is automatically chosen by the software if the

Time/Div "Auto" button is on. The user can also select the

timebase by clicking in the Time/Div window and scrolling

up and down through the possible timebases. Similarly, the

vertical scale of the oscilloscope is chosen automatically if the

Volt/Div "Auto" button is on. The user also has the option

of selecting the desired vertical scale in a similar manner to

selecting the timebase.

The other buttons associated with the oscilloscope are:

grid This button toggles the grid display of the oscillo-

scope on and off.

axis This button toggles the axis display of the oscillo-

scope on and off

text This button toggles the text displayed on the oscil-

loscope screen on and off.

line When the line button is on, the displayed samples

are joined together by lines. When this button is off,

the samples are displayed as points.

When this button is on, the dc component of the

sampled signal is removed and the signal is dis-

played. This has the effect of centering the signal

vertically on the oscilloscope screen. When this

button is off, the dc component is not removed and

the signal is displayed with its horizontal axis

corresponding to a code of 0. The ac display option

is useful for zooming in on a low-level signal that

has a large dc offset.

dual When the "dual" button is on, the oscilloscope

screen is divided into two parts with the sampled

data display centered on one horizontal axis and the

windowed data display centered on another. When

the "dual" button is off, both traces are centered on

the same horizontal axis.

This button toggles the sampled data trace on and

off.

This button toggles the windowed data trace on and

off.

HISTOGRAM ANALYZER

The histogram analyzer counts the number of occurrences of

each code in the captured samples and displays a histogram

of these counts. The most frequently occurring code is

displayed in the center of the histogram. The analyzer is

normally used with a dc input signal and calculates the mean

and the standard deviation of the sampled data. The mean

and standard deviation are displayed in both volts and in units

of the lsb size of the converter. The histogram gives a good

indication of the dc noise performance of the ADC. The

standard deviation shows directly the noise introduced in the

conversion process.

REV. A

Figure 6 Histogram Screen

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