AD7357 how to check the DC Accuracy in worst case condition

Hi

AD7357 is 14 bit , Due to DC accuracy concern , I need >0.3%

After calculated.....

DC accuracy = LSB[all of LSB , see the attachment as below ] / (2^14) , = 133 LBS / 16384  * 100% = 0.8%

AM I right ? or any part could meet this request ? ( Should meet automotive standard )

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