AMC3301: AMC3301 for voltage sensing

Edwin Cho

Part Number: AMC3301
Other Parts Discussed in Thread: AMC3330,

Hi,

Can AMC3301 be used for DC voltage sensing instead of using AMC3330 if we can are okay with the 250mV and gain? We would like to use AMC3330, but they are out of stock. What are the major difference between the AMC3301 and AMC3330 towards voltage sensing and are there concerns? Thank you

over 2 years ago

+1 Alexander Smith over 2 years ago

TI__Mastermind 47625 points

Hi Edwin,

The AMC3301 can be used for voltage sensing, however it is a bit of a challenge due to the lower input impedance and the higher input bias current compared to the AMC3330. How to use a low input impedance device for voltage sensing is covered in this document: https://www.ti.com/lit/an/sbaa350a/sbaa350a.pdf

This voltage sensing excel calculator can also help with sizing R3 and R3':https://www.ti.com/lit/zip/sbar013

Please let me know if you have any questions or would like a schematic review when you are ready!

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AMC3301: AMC3301 for voltage sensing