Q&A About the resistance value and the capacitor Value of AD7946

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About the resistance value and the capacitor Value of AD7946

Yuya over 4 years ago

Hi,

I would like to use AD7946.

But, the output of Voltage follower(AD8629) before the ADC oscillated.

So, I have three questions.

#1 Is a capacitor(2.7nF) necessary? Is it possible to reduce the value or not to use a capacitor?(In Figure.25)

#2 How high can the resistance value(33Ω) be increased?(In Figure.25, Figure.28)

　

#3 When the resistance is set to more 250 Ω, what is the THD value?(In Figure.28)

Best Regards,

Yuya

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0 Yuya on May 31, 2017 5:48 AM

Hi, Tyler

Thank you for the document. I will consider it as a reference.

I forgot the product ADAQ7980. Let me think together with the sampling rate.

I think it will be useful.

Thank you very much.

Best regards,

Yuya
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0 Yuya on May 31, 2017 5:48 AM

Hi, Tyler

Thank you for the document. I will consider it as a reference.

I forgot the product ADAQ7980. Let me think together with the sampling rate.

I think it will be useful.

Thank you very much.

Best regards,

Yuya
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