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AD7738 Zero and Full scale System Calibration

Question asked by $unil on Sep 13, 2017
Latest reply on Sep 18, 2017 by jcolao

AD7738 circuit details:

REFIN+ and AINCOM connected to 2.5V reference, REFIN- connected to ground.

Analog input voltage ranges selected as +/- 1.25V.


AVDD connected to 5V


What is the range (min and max) of external voltage that can be connected to perform

  1. Zero scale System calibration
  2. Full scale System Calibration


A zero-scale system calibration is performed on the selected channel. An external system zero-scale voltage should be provided at the AD7738 analog input and this voltage should remain stable for the duration of the calibration.