Vibro-meter 200-510-071-113 200-510-111-034 input card

The precision sigma delta (Σ-∆) products from Analog Devices, Inc., include calibration on-chip, with support for both internal calibration and system calibration. The Σ-∆ products integrate many of the additional building blocks needed in a system; gain and internal reference. Internal calibration minimizes internal offset errors and gain errors. 

The calibration methods used on the devices calibrate the offset and gain error of all internal blocks; for example, the error of the gain stage is calibrated. System offset error and gain error calibrations are supported by the converters where external components are calibrated by the analog-to-digital converter (ADC) along with the internal error sources.

OFFSET ERROR AND GAIN ERROR 

The ADCs discussed in this application note allow both unipolar and bipolar modes of operation. This section discusses unipolar mode in conjunction with offset and gain errors. The offset error is the voltage deviation from the ideal value when the ADC code is 000. Figure 1 shows the ADC transfer function.

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