AMC1350: AMC1350

john kelly

Part Number: AMC1350
Other Parts Discussed in Thread: ISO224

Hi, I am in need of a differential input, isolated opamp. I am currently trying to use the AMC1350 for CM rejection. I have attached my schematic:

V8 is Common Mode voltage.

My question is can AMC1350 be used in this configuration? If not is there a design using the ISO224 opamp

Thanks

JohnAMC1350_DiffOpamp.pdf Test1.pdf

over 1 year ago

0 Eva Mason over 1 year ago

TI__Expert 6015 points

Hi John,

Yes, you should be able to use the AMC1350 in your configuration. Isolated amplifiers can be used to remove common-mode noise from measurements. The waveforms you provided are not fully labeled, but if you want to reattach, we could better evaluate whether this is working. Additionally, you can take a look at this collateral that outlines a similar schematic.

Best regards,
Eva

0 john kelly over 1 year ago

Prodigy 90 points

Hi Eva

I have attached the plots w/ labels, I am concerned with the High-side GND1, its connection to INN (its internal path).

Thanks

JohnAMC1350_SCB.pdf Test_Noise1.pdf

0 Eva Mason over 1 year ago in reply to john kelly

TI__Expert 6015 points

Hi John,

Looking at the plots, everything looks fine. What are you concerned is happening?

Best regards,

Eva

0 john kelly over 1 year ago in reply to Eva Mason

Prodigy 90 points

Thank you

0 Eva Mason over 1 year ago in reply to john kelly

TI__Expert 6015 points

Hi John,

Yes, connecting GND1 to the common point should work. Connecting INN to the midpoint of your voltage divider should also be okay. I hope this helps!

Best regards,

Eva

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AMC1350: AMC1350