How can I analyze Squre wave with AD9236

Document created by lallison Employee on Apr 3, 2017
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I want to getting a voltage level from AD9236. But when I test AD9236 (ADC) It is difficult to anlayze a signal with low frequency. As this reason, I can't get a DC(direct current) voltage value.


ADC is always used for fluctuating signal?

As far as I know, ADC is convert analog level to digital data.


The left graph is result of squre-wave sampled. Right one is sine-wave sampled.

(Left one is squre wave sampled result. The other is sine wave sampled result)

squre wave, sine wave source is wave generator.


Below picture is the oscilloscope from generator. I think generator is not wrong.







It would appear that you are using the AC transformer coupled path with a low frequency square or sine wave that falls below the cut-off frequency.

Perhaps you can inject a higher frequency sine or square wave at 1+ MHz.  Other option is to reconfigure the evaluation board for the amplifier path and DC couple the input into the ADC.  This method would allow you to observe low frequency signals down to DC.



Yes... My Board circuit is configured with single ended... this includes is reason that I can not analyze low-frequency.. Thank you so much. I will learn more 


This document was generated from the following discussion: How can I analyze Squre wave with AD9236