Texas Instruments ADS1282EVM, User Manual, Page: 24 / 38

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11.1.3.1 System Calibration
The Start Calibration button is used for system calibration by sending the Offset and Gain Calibration
commands to the ADS1282. Which command is sent is determined by the radio buttons in the Calibration
Type groupbox (see
Figure 28 ). The calibrations should be performed separately before testing. See the
ADS1282 product data sheet for more information on calibration.
A zero input signal must be applied before performing offset calibration. The Offset radio button should be
selected. When Start Calibration is pushed, the offset calibration is performed and the resulting value is
reflected in the OFC register display (in hex).
A full-scale dc input should be applied for gain calibration. The Gain radio button should be selected.
When Start Calibration is pushed, the gain calibration is performed and the resulting value is reflected in
the FSC register display (in hex).
11.1.3.2 Manual Calibration
The values of the offset (OFC) and full-scale (FSC) calibration registers can be directly written to if there
are different offset and gain values desired to be used. The OFC or FSC registers are written to the
ADS1282 when the value in these controls changes and the user deselects the text box. For ease of
entry, the gain or offset values are entered only in the OFC or FSC controls; the actual values placed in
each of the three corresponding registers on the ADS1282 are displayed on this tab.
Figure 28. Calibration
24 ADS1282EVM and ADS1282EVM-PDK User ' s Guide SBAU144C – March 2009 – Revised May 2011
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