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AD5933 Clock Scaling

Question asked by suresh on Jun 15, 2011
Latest reply on Apr 5, 2013 by musach

Hi there


I am trying to use AD5933 as part of impedance measurement for a Bio Medical Application .

My frequency of interest (measurement) is from 50 Hz to 1 Khz.

I am aware that the data sheet says that this is possible by scaling the master clock to a lesser value.

The Data sheet also talks about a typical value of MCLK = 500 Khz for 0.1Khz to 1 kHz accuracy. (Page 34 on data sheet)


1) I am not sure of how this value was arrived


2)  What would be clk frequency for a frequency range of 50 Hz to 1 Khz


3) After scaling the frequency extenally, Should be have to program the Start grequency register 0x82, 83, 84) for the required frequncy say 50 hz or

are we forcing it externally thru scaling process.


4) As a Intial design, I am trying to use a signal generator to substitute the external clock.  Will this work?



Thank you