AnsweredAssumed Answered

AD5933EBZ evaluation board issue

Question asked by SamyakR on Jun 26, 2018
Latest reply on Jul 3, 2018 by Snorlax

I am using AD5933EBZ for my project. I am currently trying to use the calibration resistance to measure for the response of the circuit. The parameters I have currently set are as follows:

Start Freq - End Freq: 30KHz - 50KHz. with 200Hz step.

MCLK : 16MHz

Range 1: 2V p-p 

PGA gain : 1x

Rcal : 1.2K ohm ( according to the application note)

Rfb: 1.5K ohm ( according to the application note)

My gain factor calculation is 3.61E-5 and my impedance values measured are quite perfect for the Rcal. However my real and Imaginary values calculated are incredibly low as compared to what are said to be expected in other questions i read on this forum.  I cannot understand why. Can someone help me understand them? 

This is the sample data set that I have got. Similar values are for the rest of the data set. According to my calculations they are correct.

FrequencyImpedancePhaseRealImaginaryMagnitude
3000012000121418.43909
302001151.8811.941486121519.20937
304001151.8811.941486121519.20937
3060012000121519.20937
3080012000121519.20937
3100012000121519.20937
3120012000121519.20937
3140012000121519.20937
3160012000121519.20937
3180012000121519.20937
3200012000121519.20937

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