LMP8640: RSS error vs. Common-mode voltage

Liu Yang

Part Number: LMP8640

Hi Team,

I am trying to use a wonderful RSS error calculator tool on the LMP8640 page, and it gives me hundreds to thousands percent errors that are definitely wrong.

The RSS error percentage starts climbing dramatically as common mode voltage increases...

Best Regards,
Tom

over 1 year ago

+1 Javier Contreras4 over 1 year ago

TI__Mastermind 26465 points

Hello Tom,

I think there is some error on the online calculator. I will look into the fix. Please download https://www.ti.com/lit/zip/sbor020 for another comparison error tool.

0 Javier Contreras4 over 1 year ago in reply to Javier Contreras4

TI__Mastermind 26465 points

Hello Tom,

I verified that the online tool calculator uses the worst case of 60dB for the full range even though this is valid from -2V to 2.1V VCM, and 100dB values above 2.1V. Please use the calculator I shared for the valid number above 2.1V VCM.

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LMP8640: RSS error vs. Common-mode voltage