AD5933

Hi,

The system clock (MCLK) should be scaled in order to have a sweep lower than 5kHz.

Table 2 on page 20 of this user guide shows the scaled system clock and its corresponding frequency sweep range.

Best regards,

Mark

Hi Uni Ting,

No.
With the 16MHz crystal reference clock onboard. The frequency sweep would be from 5kHz to 100kHz.

I've tried generating frequency sweep from 1Hz to 1kHz with the evaluation board but the evaluation software just crashes. Also, I tried generating frequency sweep from 10Hz to 1kHz but the measurement is incorrect.

Using a lower reference clock for the board would decrease the lower limit for your frequency sweep but it also decreases the upper limit. Also, it takes the AD5933 longer to return the impedance results due to the slower ADC conversion clock speed.

Best regards,

Mark

Hi Mark :

Thanks for your feedback, 

One question, If I need frequency range increases from 1HZ ~ 1KHZ that AD5933 Rev.C evaluation board & Tools can work?

Best Regards
Uni Ting

Hi Mark :

I'm very kindly thanks for you reply!

I'm have project to Body Surface Impedance Measurement, but need measure low frequency as you know 1HZ ~ 1KHZ!

Do you have any good ideal to study it or use AD5933 and other IC to support AD5933 could be worktable. 

Best Regards
Uni Ting

You may consider looking through this thread.