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What is the proper Rf value for AD8130?

Question asked by Wojtek on Feb 27, 2013
Latest reply on Feb 27, 2013 by Wojtek


I need to use the AD8130 in G>1 configuration, using Rf/Rg to set the gain. What is the proper value of the Rf? The data sheet does not say. The Circuit Note CN-0142 shows an example with Rf=499 ohms, but it is just an example where this particular value is not discussed in full. Is the 499 ohms mandated for some reason, or can I choose a different Rf?

Specifically, I would like to use Rf of about 100 ohms to keep the Johnson noise down. Is it possible? Will AD8130 survive such a low Rf?

Thank you -- Wojtek