AD7492 artifacts

Hello!

I am using the AD7492 ADC to convert an analog signal at about 0.1 MSPS but at irregular intervals I am getting single samples which are way off. The samples always contain many 1-bits near each other e.g. 0x3FF0 or oxE000. I have outputted the result to my computer downsampled to 5 kHz which is what is in the figure below.

The schematic is attached. I have also tried adding a 10 uF capacitor to the REF OUT analog reference voltage to no avail. I am new in this area so please bear with me if I have made some silly mistake.

output.pdf
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  • Hi,

       I can see that you placed a 10uF cap in the refout pin. Would be able to replace it with a 100nF cap. The reference voltage is a critical component in the ADC conversion process. If the reference is unstable it is most likely that it will have an unstable conversion result. Please don't hesitate to ask if there are still problems.

    Regards,

    Jonathan

Reply
  • Hi,

       I can see that you placed a 10uF cap in the refout pin. Would be able to replace it with a 100nF cap. The reference voltage is a critical component in the ADC conversion process. If the reference is unstable it is most likely that it will have an unstable conversion result. Please don't hesitate to ask if there are still problems.

    Regards,

    Jonathan

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