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AMC3302: Accuracy over temperature

Part Number: AMC3302

Hello Guys,

Good day.

Our customer have a few inquiries on AMC3302 temp accuracy and we are hoping you could help clarify them:

1.  Is the total input offset voltage characterized by Vos of +/-15uV at 25C and +/- 50uV at full temp of -40V to +125C?  Or do I have to add drift specified as TCVos at temperature range of my application?
2.  Same question for gain error.  
3.  If my application requires -20C to +85C range, what the correct way to calculate the gain and offset errors?

Thanks and regards,

Art

  • Hi Art,

    1. No, drift "TCVOS Input offset drift" has to be added. 15uV is the typical number for initial offset whereas 50uV is the maximum - meaning that no devices with an initial offset greater than 50uV will leave the production line. 

    2. Similar as before, but "TCEG Gain error drift".

    3. Drift is specified starting at 25C, so for the hot 85C case, you would multiply the drift parameter by abs(85C - 25C = 60C) and for the cold case, you would multiply the drift parameter by abs(-20C - 25C = -45C). 

    We have an excel calculator that can be used for calculating typical and worst case errors. The user interface is tailored for voltage sensing, but the calculator can be used for current sensing as well: www.ti.com/.../sbar013

    Please let me know if you have any questions. 

  • Thanks Alexander!

    Art