AD5933 external clock signal

Question

Hello Community, 
 please Help me. 
 First of all s orry, I´m not experienced with it. 
 I´m designing a board for impedance spectroscopy using AD5933. 
 I´d like to change MCLK-frequencies to be able to measure lower frequencies with AD5933. If it's possible with a programmable solution I would be very happy. 
 The following table is a part of manual UG-364. I need frequencies down to 25 kHz at MCLK-Pin of AD5933.

Could you recommend me some solutions, please? I´d like to use IC´s and don't wanna spending many hours to design filters and so on. Thank you.

mcee · Accepted Answer

Hi, 
 As stated on UG-364, for a 16MHz crystal to generate your desired MCLK frequency an external clock divider should be used. To achieve a 25kHz MCLK, the 16MHz crystal should be divided by 640 which can be done using AD9558 or AD9959 that is controlled via SPI or I2C. 
 You can also use microcontrollers to generate your desired frequencies for MCLK. 
 Best regards, 
 Mark)

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AD5933 external clock signal

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