CDB5513 datasheet(8/22 Pages) CIRRUS

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CDB5510/11/12/13

DS337DB2

Offset Cal - This button allows the user to perform

a software offset calibration. To do so, the user

should connect analog inputs AIN+ and AIN- to a

zero point, and press the Offset Cal Button. The mi-

crocontroller will then obtain a number of conver-

sions from the ADC (dictated by the Cals to Avg.

Box) and average these conversions together. The

result will be stored in memory and displayed in the

Offset Box.

Gain Cal - This button allows the user to perform a

software gain calibration. To do this, the user

should connect the analog inputs AIN+ and AIN- to

a full-scale value (at least 10% less than the maxi-

mum full scale of the part, to maintain accuracy)

and press the Gain Cal Button. The microcontroller

will then obtain a number of conversions from the

ADC (dictated by the Cals to Avg. Box), subtract

out the contents of the Offset Box, and average the

results together. From this, a gain factor is comput-

ed, stored in memory, and displayed in the Gain

Factor Box.

Multiply Gain - The Multiply Gain (2x and 1/2)

Buttons allow the user to easily divide or multiply

the gain factor by 2. This feature can be used to dig-

itally scale the output of the part in software by fac-

tors of two.

Cal On/Cal Off - This switch allows the user to ap-

ply the calibration values to the data collected in

the Setup Window. When the switch is in the Off

position, the collected results will reflect the raw

conversion data from the ADC. When the switch is

in the On position, the value in the Offset Box will

be subtracted from the conversions, and the result

will be multiplied by the value in the Gain Factor

Box. The collected results will reflect the value af-

ter the calibration data has been applied.

2.3 Data Collection Window Overview

The Data Collection Window is used to collect and

analyze data sets using the evaluation board. The

software supports Time Domain, Frequency Do-

main (FFT) and Histogram analysis of collected

data sets. To go to the Data Collection Window,

pull down the Window menu item and select “Data

Collection Window”, or press F2 on the keyboard.

The following controls and indicators are present in

the Data Collection Window regardless of what test

is being performed.

COLLECT: Initiates the data conversion collec-

tion process. COLLECT has two modes of opera-

tion: collect from file or collect from converter. To

collect from a file, a previously saved file from the

ComPorts->DISK menu bar option must be select-

ed. Once a file is selected, its content will displayed

on the graph when the COLLECT button is

pressed. If the user is collecting conversions from

the evaluation board to analyze, the appropriate

COM port must be selected. The user is then free to

collect the preset number of conversions (preset by

the CONFIG pop-up menu discussed below). No-

tice, there is a significant acquisition time differ-

ence between collecting from a file and collecting

from the evaluation board. Data can only be col-

lected from the evaluation board at the converter’s

current sampling frequency, and will take much

longer than retrieving previously collected data

from a file.

CANCEL: This button allows the user to exit from

the COLLECT algorithm during a collection. It is

recommended that the user reset the evaluation

board after pressing this button, so that the evalua-

tion board will stop collecting data and wait for the

next command.

OUTPUT: This button calls up a pop-up window

which allows the user to save the collected data set

to a file or print out the information on the screen.

Two printing options are available: printing only

the plot data, and printing the entire screen includ-

ing the calculated statistics for the current analysis

mode.

ZOOM: Pressing this button allows the user to

zoom in on a specific portion of the current graph.

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

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