Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

INA240-Q1: INA240A-Q1

Part Number: INA240-Q1

Tool/software:

Hi Team,

I am using two INA240A1-Q1 IC used for measuring same current based on project requirement. (like below). We used different (Supplier) LDOs for providing supply to each INA240A1-Q1 IC.

Now i am planning to calculate error budget for CSA amplifier. 

My LDOs tolerances like LDO_1 ==> 3.234V to 3.366V & LDO_2 ==> 3.201V to 3.399V. My operating temperature is -40C to 85C.

I need clarification for below point:

Q). Shall i consider both CSA amplifier tolerances single side only ( like +Ve tol. or -Ve tol.) or Do i  need to consider worst case (one is min & one is max)??

If i consider worst case then my error budget value is high. (In calculation included Gain error, offset error, Reference divider tolerances & supply tolerances).

Thanks & regards,

Giridhar.

  • Hi Giridhar,

    Please take a look at section “8.4.4 Calculating Total Error”. Typically we don’t simply add all the max errors. Let me know if you have further questions after reviewing the calculation examples.

    Regards

    Guang