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LMC6482: Unable to get 700mA constant current

Part Number: LMC6482

Hi, I'm designing a Bio-Impedance Analyzer for which I need a current of 700mA at 50kHz and 100kHz. I have implemented the Howland current source using LMC6482, but I'm unable to get a constant current at the output. Is there a resistance combination that can get the desired value or is there any other issue? 

This is my circuit