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Regarding square wave (~7.8125 kHz) is present at RCLK_OUT (J3) - ADA2200

Hi, 

I have started to use an ADA2200 for the purpose of employing it as a Lock-in Amplifier. 

For starting the operation, I am following the document - ADA2200SDP-EVALZ (Rev. 0) (analog.com).

On page 3, point no. 8, it is mentioned that "Verify that a square wave (~7.8125 kHz) is present at RCLK_OUT (J3). Connect RCLK_OUT to VINP (J7) with an SMA cable".

I am doing that, but getting a frequency of around 63 kHz. I am not sure why this is happening. I would be grateful if you could kindly help me sort this out. 

Thank you in advance 



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[edited by: Shaumik at 11:57 AM (GMT -5) on 1 Mar 2022]
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  • Hi Kristine, further to my reply on 15th June, I would be grateful if you could kindly let me know if the two signal components are referred to as the in-phase (I) and quadrature (Q) components of the signal can be obtained from AD630 or LTC6943, that will help me get both amplitude and phase measurements during the lock-in amplifier operation - (similar to what is given on page 16 of the datasheet of ADA2200 (Rev. 0) (analog.com). Looking forward to hear from you.

    Thanks.

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