CDB5521 datasheet(17/28 Pages) CIRRUS

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CDB5521/22/23/24/28

DS317DB2

Window - Used in the Power Spectrum

Window to calculate the FFT. Windowing

algorithms include the Blackman, Black-

man-Harris, Hand, 5-term Hodie, and 7-

term Hodie. The 5-term Hodie and 7-term

Hodie are windowing algorithms developed

at Crystal Semiconductor. If information

concerning these algorithms is needed, call

technical support.

Average - Sets the number of consecutive

FFT’s to perform and average.

Limited Noise Bandwidth - Limits the

amount of noise in the converters band-

width. When set to zero, no limited noise

calculations are done.

FFT Bandwidth - Used in the Power Spec-

trum Window to allow user-scalability of

the frequency axis. When set to zero, the

axis is auto-scaled to one-half the output

word rate.

OK - Accept the changes

•

MAGNITUDE

Displays the y-axis value of the cursor on the

Histogram.

•

MAXIMUM

Indicator for the maximum value of the collect-

ed data set.

•MEAN

Indicator for the mean of the data sample set.

•

MINIMUM

Indicator for the minimum value of the collect-

ed data set.

•

Output

Control that calls a pop-up menu. This menu

controls three options:

1) save current data set to a file with the CDB-

CAPTURE format

2) print current screen, or

3) print current graph.

•

RESTORE

Restores the display of the graph after zoom has

been entered.

•

STD. DEV.

Indicator for the Standard Deviation of the col-

lected data set.

•

VARIANCE

Indicates the Variance for the current data set.

•

ZOOM

Control icon that allows the operator to zoom in

on a specific portion of the current graph. To

zoom, click on the ZOOM icon, then click on the

graph to select the first point (the 1st point is the

top left corner of the zoom box). Then click on

the graph again to select the second point (the

2nd point is the bottom right corner of the zoom

box). Once an area has been zoomed in to, the

OUTPUT functions can be used to print a hard

copy of that region. Click on RESTORE when

done with the zoom function.

2.7 Frequency Domain Window (i.e. FFT)

The following describe the controls and indicators

associated with the Frequency Domain Analysis

(Figure 8).

•

CANCEL

See description in Section 2.6, Histogram

Window Overview.

•

Channel

See description in Section 2.6, Histogram Win-

dow Overview.

•

COLLECT

See description in Section 2.6, Histogram Win-

dow Overview.

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