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AD7730 Internal-zero-scale calibration

Hi, I am using the AD7730 and i have some problems with the Internal zero-scale calibration. I use the SPI interface to communicate between my uC and the AD converter.

I am able to wirte and read from the registers of the AD7730.

The converter is configured in bipolare mode, HIREF = 1( 5V ), Range : +-10mV, 16bit mode.

I am using two AD7730 parallel which are selected with two CHIP-Select.


After a calibration cycle the value of the corresponding Offset-Register changed by a very small value but there is still an offset(approx. 30150) to the expected value of 32768 when the input pins are shorted.


Has anyone any advices?


This FAQ was generated from the following discussion: AD7730 Internal-zero-scale calibration