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REF5030: Low pass filter for REF5030

Part Number: REF5030
Other Parts Discussed in Thread: OPA4350


Let me ask you a question about low pass RC filter.

I am using REF5030 as a 3.0V reference for ADC.

The configuration of the circuit is following.

REF5030 - RC filter(1K/1uF) - OPA4350(Buffer) - ADC(TMS320F28386)

I measured the voltage of  the front point and back point of the RC filter.

The result is 3.0V(front) and 3.3V(back).

(Please check the attached document.)

I do not understand the difference between front and back.

Will you teach me the reason why?

REF5030 Question May10 2022.pdf 

Thank you for your support.

Best Regards,