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How to do with offset in DC measurement circuit?

Other Parts Discussed in Thread: TMS320F28335, OPA344

Dear All,

I am sampling a DC bipolar voltage ( -1.5 to 1.5 volt ) and passes through a OPA344 circuit to level up to 1.5 volt using a reference voltage ic. ( ADC of TMS320F28335. )

Please help me how can i treat with offset in the DC measurement circuit?

Regards, Ras