Input impedance of AMC1200

Hello Marc,

We do not have any characterization data on the input impedance change with temperature. The AMC1200 was designed to work most effectively with small output impedance sources. The sampling frequency and sampling capacitors are quite stable over temperature but the best resource to avoid errors caused by potential Rin drift is to either buffer your signal source or choose a source with lower output impedance.

Hope this helps.

Best regards,

Jose

Thank you Jose,

I will buffer my signal source to keep the impedance low.

Another question is about gain and offset stability in time (per year, or after 1000 hours at high temperature).
Can you provide me data ?

Best regards,

Marc

Hello Mark,

I will have to look for specific lifetime data on this IC, if I find it I will update this post.

In the meantime, the following blog post treats this subject: https://e2e.ti.com/blogs_/b/precisionhub/archive/2014/02/20/ic-long-term-stability-the-only-constant-is-change

In essence: gain error and offset error may shift up to +/-100% of the max(min) datasheet specification over the lifetime of the device (operating at room temperature) or over a shorter period of time if the ambient temperature is higher.

Hope this helps.

Best regards,

Jose