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Calculation of Voltage from DFT results

Category: Hardware
Product Number: AD5940

Hi,
I use AD5940 to find the impedances. I apply a DFT of 512. I also need to get the voltage value for my experiments. How do I convert the DFT Real and DFT Imag values to voltage values. The ADC transfer function given is for 16 bit ADC codes. But the DFT results are 18 bit in 2s compliment form. How do I get the voltage from it?