connections for ad7622 to have 2.048V on ref pin?
When pins PDREF/PDBUF = low, the internal reference and buffer are enabled producing 2.048 V on the REF pin. Figure 24 shows a typical application diagram and more information on reference options can be found on the Voltage Reference Input section of the AD7622 datasheet.
I moved your question to the precision ADC space, someone here should be able to help.
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